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Unable to locate persister

I have the following problem when i try to do the findCliente method. I have the class Cliente in the package model and when i run the findCliente controller I get this exception here. I don't know where I'm wrong because I don't have much skill with JPA and Spring Suite. Can someone tell me how to fix this exception?
Exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Unable to locate persister: it.myshop.orm.model.Cliente
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
java.lang.IllegalArgumentException: Unable to locate persister: it.myshop.orm.model.Cliente
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3416)
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3357)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362)
com.sun.proxy.$Proxy41.find(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311)
com.sun.proxy.$Proxy41.find(Unknown Source)
it.myshop.orm.impl.ClienteServiceImpl.getById(ClienteServiceImpl.java:23)
it.myshop.orm.controller.ClienteController.findCliente(ClienteController.java:37)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
org.hibernate.UnknownEntityTypeException: Unable to locate persister: it.myshop.orm.model.Cliente
org.hibernate.metamodel.internal.MetamodelImpl.locateEntityPersister(MetamodelImpl.java:727)
org.hibernate.internal.SessionImpl.locateEntityPersister(SessionImpl.java:3019)
org.hibernate.internal.SessionImpl.access$1800(SessionImpl.java:201)
org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2715)
org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2698)
org.hibernate.internal.SessionImpl.byId(SessionImpl.java:1180)
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3380)
org.hibernate.internal.SessionImpl.find(SessionImpl.java:3357)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362)
com.sun.proxy.$Proxy41.find(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311)
com.sun.proxy.$Proxy41.find(Unknown Source)
it.myshop.orm.impl.ClienteServiceImpl.getById(ClienteServiceImpl.java:23)
it.myshop.orm.controller.ClienteController.findCliente(ClienteController.java:37)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
AppConfig
package it.myshop.orm.config;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.Database;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfig;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
import it.myshop.orm.dao.ClienteService;
import it.myshop.orm.impl.ClienteServiceImpl;
#EnableWebMvc
#Configuration
#ComponentScan("it.myshop.orm.controller")
public class AppConfig {
#Bean
public ViewResolver getViewResolver() {
InternalResourceViewResolver iwv = new InternalResourceViewResolver();
iwv.setPrefix("/WEB-INF/view/");
iwv.setSuffix(".jsp");
iwv.setViewClass(JstlView.class);
return iwv;
}
//BEAN CONNESSIONE AL DB
#Bean
public DataSource getDbConnection() {
DriverManagerDataSource ds = new DriverManagerDataSource();
ds.setDriverClassName("com.mysql.cj.jdbc.Driver");
ds.setUrl("jdbc:mysql://localhost:3306/corso-spring-ud?serverTimezone=CET");
ds.setUsername("root");
return ds;
}
#Bean
public LocalContainerEntityManagerFactoryBean getEntityManager() {
HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
adapter.setDatabase(Database.MYSQL);
adapter.setGenerateDdl(true);
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setDataSource(getDbConnection());
factory.setJpaVendorAdapter(adapter); //passo adapter
factory.setPackagesToScan(getClass().getPackage().getName());
return factory;
}
#Bean
public ClienteService getClienteServiceImpl() {
return new ClienteServiceImpl();
}
App Initializer
package it.myshop.orm.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import it.myshop.orm.config.AppConfig;
public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
#Override
protected Class<?>[] getRootConfigClasses() {
// TODO Auto-generated method stub
return null;
}
#Override
protected Class<?>[] getServletConfigClasses() {
// TODO Auto-generated method stub
return new Class<?>[] {AppConfig.class};
}
#Override
protected String[] getServletMappings() {
// TODO Auto-generated method stub
return new String[] {"/"};
}
}
ClienteController
package it.myshop.orm.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import it.myshop.orm.dao.ClienteService;
import it.myshop.orm.impl.ClienteServiceImpl;
import it.myshop.orm.model.Cliente;
#Controller
#RequestMapping("/cliente")
public class ClienteController {
#Autowired
private ClienteService cs;
#ResponseBody
#GetMapping("/add")
public String add() {
// cs.add(null);
System.out.println("Sei nella pagina di aggiunta");
return null;
}
#ResponseBody
#GetMapping("/findCliente")
public String findCliente() {
Cliente c = cs.getById(1);
System.out.println("Sei nella pagina di find del Cliente");
return c.getNome() + " " + c.getCognome();
}
Cliente
package it.myshop.orm.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="cliente")
public class Cliente {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column
private String nome;
#Column
private String cognome;
#Column
private String codiceFiscale;
#Column
private String email;
#Column
private String telefono;
#Column
private String username;
#Column
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public String getCognome() {
return cognome;
}
public void setCognome(String cognome) {
this.cognome = cognome;
}
public String getCodiceFiscale() {
return codiceFiscale;
}
public void setCodiceFiscale(String codiceFiscale) {
this.codiceFiscale = codiceFiscale;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getTelefono() {
return telefono;
}
public void setTelefono(String telefono) {
this.telefono = telefono;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
Interface ClienteService
package it.myshop.orm.dao;
import it.myshop.orm.model.Cliente;
public interface ClienteService {
public Cliente add(Cliente c);
public Cliente getById(int id);
}
ClienteServiceImpl
package it.myshop.orm.impl;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import it.myshop.orm.dao.ClienteService;
import it.myshop.orm.model.Cliente;
public class ClienteServiceImpl implements ClienteService {
#PersistenceContext
public EntityManager em;
#Override
public Cliente add(Cliente c) {
em.persist(c);
return c;
}
#Override
public Cliente getById(int id) {
return em.find(Cliente.class, id);
}
}

In order to solve this problem you have two options. You can choose either of which .
1- you must have all you entity classes declared in you hibernate configuration file.
for this you must add you entity classes specially "Cliente" in hibernate.cfg.xml file
like this :
<mapping class="entity.Client"/>
or
2-another way is adding this entity to session configuration like this :
SessionFactory factory = new Configuration().configure("hibernate.cfg.xml") .addAnnotatedClass(Cliente.class) .buildSessionFactory();

Unable to get data from h2

I'm trying to do a simple task. I've an API which is trying to create a post using userId and post desc as params. I'm initializing users in h2 DB directly using data.sql. In PostService, I'm trying to get user by userId using userRepo.findById(userId). The param is passed to the service from the request. However, I'm not getting any users. I'm getting a NullPointerException. I checked the h2 db and I can see my users being present. Even the sout's are not working.
Tried a few answers from internet, no luck as of yet.
Here's the code:
User.java
package com.interview.LLD.demo;
import javax.persistence.*;
#Entity
#Table(name = "User")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
public User() {
}
public User(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
PostController.java
package com.interview.LLD.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
#RestController
#RequestMapping("/posts")
public class PostController {
#Autowired
private PostService postService;
#PostMapping("/create")
public Post createPost(#RequestBody CreatePostRequestBody createPostRequestBody) {
try {
return postService.createPost(createPostRequestBody.getDesc(), createPostRequestBody.getPostId());
}
catch (Exception e) {
System.out.println("e = " + e.getMessage());
return null;
}
}
#GetMapping("/getAllByUser")
public List<Post> getAllPostsByUser(#PathVariable Integer user) {
return postService.getAllPostsByUser(user);
}
}
PostService.java
package com.interview.LLD.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
#Service
public class PostService {
#Autowired
private PostRepo postRepo;
#Autowired
private UserRepo userRepo;
public Post createPost(String postDesc, int userId) throws Exception {
System.out.println("no of users = " + userRepo.count());
userRepo.findAll().forEach(e -> System.out.print(e.getId() + " " + e.getName()));
User user = userRepo.findById(2).orElseThrow(Exception::new);
Post post = new Post(postDesc, user);
return postRepo.save(post);
}
public List<Post> getAllPostsByUser(int userId) {
User user = userRepo.findById(userId).get();
return postRepo.getAllPostsByUser(user);
}
}
data.sql
DROP TABLE IF EXISTS User;
CREATE TABLE User (
id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(250) NOT NULL
);
INSERT INTO User (name) VALUES
('Karan'),
('Ben'),
('John');
application.properties
server.port = 8081
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_ON_EXIT=FALSE;
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.main.allow-bean-definition-overriding=true
spring.jpa.hibernate.ddl-auto=update
spring.sql.init.data-locations=classpath:data.sql
spring.datasource.initialization-mode=always
Post.java
package com.interview.LLD.demo;
import javax.persistence.*;
#Entity
#Table(name = "Post")
public class Post {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int postId;
private String postDesc;
#ManyToOne
#JoinColumn(name = "id",nullable = false)
private User user;
public Post() {
}
public Post(String postDesc, User user) {
this.postDesc = postDesc;
this.user = user;
}
public int getPostId() {
return postId;
}
public String getPostDesc() {
return postDesc;
}
public void setPostDesc(String postDesc) {
this.postDesc = postDesc;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
StackTrace:
java.lang.NullPointerException
at com.interview.LLD.demo.PostController.createPost(PostController.java:17)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:681)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Thanks in advance.

Got it!
A silly mistake but I'm a noob to spring boot. In the #RequestBody class, I'd named the int param differently as to what I was sending in the request. My question then is, in spring do we have to have same names in request and in the class variables?

Why do you declare your path variable there and you don't use it ?
#GetMapping("/getAllByUser")
public List<Post> getAllPostsByUser(#PathVariable Integer user) {
return postService.getAllPostsByUser(user);
}
Instead you should pass the user id in the URL of the post request:
#GetMapping("/getAllByUser/{user})
public List<Post> getAllPostsByUser(#PathVariable("user") Integer user) {
return postService.getAllPostsByUser(user);
}
Of course it will trow a NullPointerException because you are calling the API with a null user.

oracle.jdbc.OracleDatabaseException: ORA-01400: cannot insert NULL into ("SCOTT"."D_TEST"."DTESTID") in spring boot jpa

I am trying to add newtest through postmethod and getting this error.
unable to find the cause can someone help me
I don't know why it is taking null can someone help me
2021-05-12 06:14:47.963 ERROR 7048 --- [nio-8099-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : ORA-01400: cannot insert NULL into ("SCOTT"."D_TEST"."DTESTID")
2021-05-12 06:14:47.989 ERROR 7048 --- [nio-8099-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [/Test] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause
oracle.jdbc.OracleDatabaseException: ORA-01400: cannot insert NULL into ("SCOTT"."D_TEST"."DTESTID")
at oracle.jdbc.driver.T4CTTIoer11.processError(T4CTTIoer11.java:513) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CTTIoer11.processError(T4CTTIoer11.java:461) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1104) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:553) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:269) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:655) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:270) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:91) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:970) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1205) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3666) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.T4CPreparedStatement.executeInternal(T4CPreparedStatement.java:1426) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.OraclePreparedStatement.executeLargeUpdate(OraclePreparedStatement.java:3756) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3736) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1063) ~[ojdbc8-19.8.0.0.jar:19.8.0.0.0]
at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-3.4.5.jar:na]
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:197) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:45) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3195) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3801) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:84) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:645) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:263) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:317) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:330) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:123) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:185) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:128) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:55) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:720) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:706) ~[hibernate-core-5.4.30.Final.jar:5.4.30.Final]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:362) ~[spring-orm-5.3.6.jar:5.3.6]
at com.sun.proxy.$Proxy85.persist(Unknown Source) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311) ~[spring-orm-5.3.6.jar:5.3.6]
at com.sun.proxy.$Proxy85.persist(Unknown Source) ~[na:na]
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:557) ~[spring-data-jpa-2.4.8.jar:2.4.8]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:524) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:285) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:531) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:156) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:131) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.4.8.jar:2.4.8]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.6.jar:5.3.6]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.6.jar:5.3.6]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.6.jar:5.3.6]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.6.jar:5.3.6]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:174) ~[spring-data-jpa-2.4.8.jar:2.4.8]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.6.jar:5.3.6]
at com.sun.proxy.$Proxy89.save(Unknown Source) ~[na:na]
at com.cg.controller.IDiagnosticTestController.addNewTest(IDiagnosticTestController.java:45) ~[main/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.6.jar:5.3.6]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.6.jar:5.3.6]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
DiagnosticTest.java
package com.cg.entites;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.annotation.JsonNaming;
#Entity
#Table(name="d_test")
//#JsonNaming(PropertyNamingStrategy.LowerCaseStrategy.class)
public class DiagnosticTest implements Serializable{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="dtestid")
private int dtestid;
#Column(name="testname",nullable=true)
private String testname;
#Column(name="testprice",nullable=true)
private Integer testprice;
#Column(name="normalvalue",nullable=true)
private String normalvalue;
#Column(name="units")
private String units;
#ManyToMany(mappedBy="tests")
//#JsonIgnore
private Set<DiagnosticCenter> diagnosticCenters = new HashSet<>();
#JsonIgnore
public int getDtestid() {
return dtestid;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
public void setDtestid(int dtestid) {
this.dtestid = dtestid;
}
public String getTestname() {
return testname;
}
public void setTestname(String testname) {
this.testname = testname;
}
public Integer getTestprice() {
return testprice;
}
public void setTestprice(Integer testprice) {
this.testprice = testprice;
}
public String getNormalvalue() {
return normalvalue;
}
public void setNormalvalue(String normalvalue) {
this.normalvalue = normalvalue;
}
public String getUnits() {
return units;
}
public void setUnits(String units) {
this.units = units;
}
public Set<DiagnosticCenter> getDiagnosticCenters() {
return diagnosticCenters;
}
public void setDiagnosticCenters(Set<DiagnosticCenter> diagnosticCenters) {
this.diagnosticCenters = diagnosticCenters;
}
#Override
public String toString() {
return "DiagnosticTest [dtestid=" + dtestid + ", testname=" + testname + ", testprice=" + testprice
+ ", normalvalue=" + normalvalue + ", units=" + units + ", diagnosticCenters=" + diagnosticCenters
+ "]";
}
}
DignosticCenter.java
import java.io.Serializable;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinTable;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import com.fasterxml.jackson.annotation.JsonIgnore;
#Entity
#Table(name="d_center")
public class DiagnosticCenter implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="dcenterid")
private int dcenterid;
#Column(name="name",nullable=true)
private String name;
#Column(name="contactNo",nullable=true)
private String contactNo;
#Column(name="address",nullable=true)
private String address;
#Column(name="contactEmail",nullable=true)
private String contactEmail;
#Column(name="servicesOffered",nullable=true)
private String servicesOffered;
#ManyToMany(cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
#JoinTable(name = "center_test", joinColumns =
{ #JoinColumn(name = "dcenterId") },
inverseJoinColumns = { #JoinColumn(name = "dtestId")})
#JsonIgnore
private Set<DiagnosticTest> tests = new HashSet<>();
public int getDcenterid() {
return dcenterid;
}
public void setDcenterid(int dcenterid) {
this.dcenterid = dcenterid;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContactNo() {
return contactNo;
}
public void setContactNo(String contactNo) {
this.contactNo = contactNo;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getContactEmail() {
return contactEmail;
}
public void setContactEmail(String contactEmail) {
this.contactEmail = contactEmail;
}
public String getServicesOffered() {
return servicesOffered;
}
public void setServicesOffered(String servicesOffered) {
this.servicesOffered = servicesOffered;
}
public Set<DiagnosticTest> getTests() {
return tests;
}
public void setTests(Set<DiagnosticTest> tests) {
this.tests = tests;
}
#Override
public String toString() {
return "DiagnosticCenter [dcenterid=" + dcenterid + ", name=" + name + ", contactNo=" + contactNo + ", address="
+ address + ", contactEmail=" + contactEmail + ", servicesOffered=" + servicesOffered + "]";
}
}
DiagnosticTestRepository
import java.util.List;
import java.util.Optional;
import java.util.Set;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.cg.entites.DiagnosticCenter;
import com.cg.entites.DiagnosticTest;
import com.cg.exceptions.DiagnosticCenterNotFoundException;
#Repository
public interface IDiagnosticTestRepository extends JpaRepository<DiagnosticTest,Integer>{
/*public List<DiagnosticTest> getAllTest();
public DiagnosticTest addNewTest(DiagnosticTest test);
public List<DiagnosticTest> getTestsOfDiagnosticCenter(int dcenter_Id) throws DiagnosticCenterNotFoundException;
public DiagnosticTest updateTestDetail(DiagnosticTest test);
public DiagnosticTest removeTestFromDiagnosticCenter(int dcenter_Id, DiagnosticTest test) throws DiagnosticCenterNotFoundException;
*/
public DiagnosticTest findByDiagnosticCenters(int dcenterid) throws DiagnosticCenterNotFoundException;
public Optional<DiagnosticTest> findById(int dtestid);
}
DiagnosticCenterRepository
package com.cg.dao;
import java.util.List;
import java.util.Set;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.cg.entites.DiagnosticCenter;
import com.cg.entites.DiagnosticTest;
import com.cg.exceptions.DiagnosticCenterNotFoundException;
#Repository
public interface IDiagnosticCenterRepository extends JpaRepository<DiagnosticTest,Long>{
}
DiagnosticTestService
package com.cg.service;
import java.util.List;
import org.springframework.stereotype.Service;
import com.cg.entites.DiagnosticTest;
import com.cg.exceptions.DiagnosticCenterNotFoundException;
import com.cg.exceptions.TestNotFoundException;
#Service
public interface IDiagnosticTestService {
public List<DiagnosticTest> getAllTest();
public DiagnosticTest addNewTest(DiagnosticTest test);
public List<DiagnosticTest> getTestsOfDiagnosticCenter(int dcenterid) throws DiagnosticCenterNotFoundException;
public DiagnosticTest updateTestDetail(DiagnosticTest test);
public DiagnosticTest removeTestFromDiagnosticCenter(int dcenterid) throws DiagnosticCenterNotFoundException;
}
DiagnosticTestServiceImpl
package com.cg.service;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import javax.transaction.Transactional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import com.cg.dao.IDiagnosticCenterRepository;
import com.cg.dao.IDiagnosticTestRepository;
import com.cg.entites.DiagnosticCenter;
import com.cg.entites.DiagnosticTest;
import com.cg.exceptions.DiagnosticCenterNotFoundException;
import com.cg.exceptions.TestNotFoundException;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.annotation.JsonNaming;
#Service
public class IDiagnosticTestServiceImpl implements IDiagnosticTestService{
#Autowired
private IDiagnosticTestRepository dtestrepo;
#Autowired
private IDiagnosticCenterRepository dcenterrepo;
#Override
#Transactional
public List<DiagnosticTest> getAllTest() {
return dtestrepo.findAll();
}
#Override
#Transactional
public DiagnosticTest addNewTest(DiagnosticTest test){
DiagnosticTest dt=dtestrepo.save(test);
System.out.println(dt);
return dt;
}
#Override
public DiagnosticTest updateTestDetail(DiagnosticTest test) {
Optional<DiagnosticTest> dt=dtestrepo.findById(test.getDtestid());
if(dt.isPresent()) {
DiagnosticTest db=dt.get();
db.setTestname(test.getTestname());
db.setTestprice(test.getTestprice());
db.setNormalvalue(test.getNormalvalue());
db.setUnits(test.getUnits());
db.getDiagnosticCenters();
return dtestrepo.save(test);
}
return null;
}
#Override
public List<DiagnosticTest> getTestsOfDiagnosticCenter(int dcenterid) throws DiagnosticCenterNotFoundException {
// TODO Auto-generated method stub
return null;
}
#Override
public DiagnosticTest removeTestFromDiagnosticCenter(int dcenterid) throws DiagnosticCenterNotFoundException {
DiagnosticTest dt=dtestrepo.findByDiagnosticCenters(dcenterid);
System.out.println(dtestrepo.findByDiagnosticCenters(dcenterid));
dtestrepo.delete(dt);
return dt;
}
}
DiagnosticTestController
package com.cg.controller;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.cg.dao.IDiagnosticTestRepository;
import com.cg.entites.DiagnosticTest;
import com.cg.exceptions.DiagnosticCenterNotFoundException;
import com.cg.exceptions.TestNotFoundException;
import com.cg.service.IDiagnosticTestService;
import com.cg.service.IDiagnosticTestServiceImpl;
#RestController
#RequestMapping("/api/v1")
public class IDiagnosticTestController {
#Autowired
IDiagnosticTestServiceImpl dtservice;
#Autowired
IDiagnosticTestRepository dtrepo;
#GetMapping("/dtest")
public List<DiagnosticTest> findAllTests(){
return dtrepo.findAll();
}
#PostMapping("/dtest/addtest")
public ResponseEntity<DiagnosticTest> addNewTest(
#RequestBody DiagnosticTest test){
return new ResponseEntity<DiagnosticTest>(dtrepo.save(test),HttpStatus.OK);
}
/* #GetMapping("/dtest/{dcenterId}")
public ResponseEntity<List<DiagnosticTest>> findTestsofDiagnosticCenter(
#PathVariable("dcenterId") int dcenterId) throws DiagnosticCenterNotFoundException{
List<DiagnosticTest> tests=dtservice.getTestsOfDiagnosticCenter(dcenterId);
if(tests!=null) {
return new ResponseEntity<List<DiagnosticTest>>(tests,HttpStatus.OK);
}
throw new DiagnosticCenterNotFoundException("diagnostic center is not found");
}*/
#PutMapping("/dtest/dtests")
public ResponseEntity<DiagnosticTest> updateTest(
#RequestBody DiagnosticTest test){
DiagnosticTest tests=dtservice.updateTestDetail(test);
if(tests==null) {
return new ResponseEntity("Sorry Tests are not available",HttpStatus.NOT_FOUND);
}
return new ResponseEntity<DiagnosticTest>(test,HttpStatus.OK);
}
#DeleteMapping("/removeTestFromDiagnosticCenter")
public ResponseEntity<DiagnosticTest> findByDiagnosticCenters(#RequestBody int dcenterid) throws DiagnosticCenterNotFoundException{
return new ResponseEntity<DiagnosticTest>(dtrepo.findByDiagnosticCenters(dcenterid), HttpStatus.OK);
// throw new DiagnosticCenterNotFoundException("centerId not found");
}
}
Please help me.

Since your indicates you're using ORACLE, I have to ask if you plan to use a database-side sequence (I would recommend it). Assuming you've created it, you should wire it in using something like #SequenceGenerator(name="my_entity_seq_gen", sequenceName="MY_ENTITY_SEQ").
It would go with the same ID field you have your #GeneratedValue annotation placed on.
Here is another SO question that discusses it and shows the syntax: Hibernate sequence on oracle, #GeneratedValue(strategy = GenerationType.AUTO)
With that your ORM should be able to defer to Oracle to generate a proper sequence for the ID to be saved upon initial persistence of the object (i.e. when you would be INSERTING it for the first time).
I think you can get away with NOT using an Oracle sequence, but I'm not 100% sure. (When I used oracle, I always did).
Another good thread on the topic: what is the use of annotations #Id and #GeneratedValue(strategy = GenerationType.IDENTITY)? Why the generationtype is identity?
Be sure to follow the "Oracle" tracks when reading these threads.

Since you have #GeneratedValue(strategy = GenerationType.IDENTITY) as the strategy the table in database must have identity generator. As explained in JPA docs below -
IDENTITY public static final GenerationType IDENTITY Indicates that
the persistence provider must assign primary keys for the entity using
a database identity column.
For example in Oracle 12c you can define identity column as
create table test (
test_col1 NUMBER GENERATED ALWAYS as IDENTITY(START with 1 INCREMENT by 1),
test_col2 VARCHAR2(10)
);

NullPointerException in sprinboot+jpa+gradle

As the title says I'm getting a null pointer exception when I call a method in my data repository to retrieve some data. I'm making an API with the Spring Boot framework using JPA+Hibernate
I've checked if the method parameters are null or empty but all the parameters are good. I also tried changing the query but I'm getting the same nullpointerexception on execution time.
java.lang.NullPointerException: Cannot invoke "com.cg.entites.User.getUsername()" because "u2" is null
at com.cg.contoller.UserController.addUser(UserController.java:45) ~[main/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.6.jar:5.3.6]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.6.jar:5.3.6]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
1.User class
package com.cg.entites;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="Users")
public class User implements Serializable{
private static final long serialVersionUID = 1L;
#Id
private int id;
private String username;
private String password;
private String role;
public User() {
super();
}
public User(int id, String username, String password, String role) {
super();
this.id = id;
this.username = username;
this.password = password;
this.role = role;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
#Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password + ", role=" + role + "]";
}
}
2.UserRepository
package com.cg.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.cg.entites.User;
import com.cg.exceptions.InvalidException;
#Repository("urepo")
public interface UserRepository extends JpaRepository<User,Integer>{
#Query("SELECT u FROM User u WHERE u.username = :username")
public User getUserByUsername(#Param("username") String username);
}
3.UserService
package com.cg.service;
import java.util.List;
import java.util.Optional;
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import com.cg.dao.UserRepository;
import com.cg.entites.User;
import com.cg.exceptions.InvalidException;
#Service
public class UserServiceImpl implements UserService{
#Autowired
UserRepository urepo;
#Override
public List<User> getAllUsers() {
// TODO Auto-generated method stub
List<User> ulist=urepo.findAll();
return ulist;
}
#Override
#Transactional
public User addUser(User user) {
// TODO Auto-generated method stub
return urepo.save(user);
}
#Override
#Transactional
public User removeUser(int userId) {
// TODO Auto-generated method stub
Optional<User> u=urepo.findById(userId);
if(u.empty()!=null) {
urepo.deleteById(userId);
return u.get();
}
return null;
}
#Override
#Transactional
public User validateUser(String username, String password) throws InvalidException{
User u=urepo.getUserByUsername(username);
System.out.println("u details"+u);
if(u==null) {
System.out.println("InValid User");
}
return u;
}
}
4.userException
package com.cg.exceptions;
public class InvalidException extends Exception {
public InvalidException(String msg) {
super(msg);
}
}
5.UserContoller
package com.cg.contoller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PatchMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.cg.dao.UserRepository;
import com.cg.entites.User;
import com.cg.exceptions.InvalidException;
import com.cg.service.UserService;
#RestController
#RequestMapping("/api/v1")
public class UserController {
#Autowired
UserService service;
#Autowired
UserRepository urepo;
#GetMapping("/user")
public List<User> findUser(){
return urepo.findAll();
}
#PostMapping("/user")
public ResponseEntity<User> addUser(#RequestBody User user) throws InvalidException{
User u2=service.validateUser(user.getUsername(),user.getPassword());
System.out.println("Valid u2 "+u2);
if(u2.getUsername()==null && u2.getPassword()==null) {
User user1 = service.addUser(u2);
System.out.println("user successfully registered");
}
else {
System.out.println("add user method accessed");
throw new InvalidException("Invalid user in controller");
}
return null;
}
#DeleteMapping("/user/{id}")
public ResponseEntity<User> deleteUser(#PathVariable int id) {
User user1 = service.removeUser(id);
if(user1!=null) {
System.out.println("User successfully removed");
return new ResponseEntity<>(user1,HttpStatus.OK);
}
System.out.println("delete user method accessed");
//throw new UserNotFoundException("Invalid user id");
return null;
}
}
6.build.grdale
plugins {
id 'org.springframework.boot' version '2.4.5'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.cg'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-web'
runtimeOnly 'com.oracle.database.jdbc:ojdbc8'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
test {
useJUnitPlatform()
}
I don't know where the error is can someone help me.

As I can see from the stack trace, the problem is in the line before the last one of this piece of code
User u2=service.validateUser(user.getUsername(),user.getPassword());
System.out.println("Valid u2 "+u2);
if(u2.getUsername()==null && u2.getPassword()==null) {
User user1 = service.addUser(u2);
u2 is null.
This code is called from controller method addUser, so user probably doesn't exist.
u2 comes from validateUser method and it simply calls you repository method. Since user doesn't exist, the repository should return null.
As a conclude from your code, you thought, that repository should return a non null User object with all fields equal to null. Because that's when you decide to add user.
Please tell me if I was correct ))
It's really weird, that you add User with name == null and password == null by the way ))

#SequenceGenerator throws After saving the identifier must not be null! when value of id not passed in h2

I am using spring boot with h2 database when using a sequence and using #SequenceGenerator doesn't seem to be generating the value for the primary key. I want to generate the value of Id by default and then update the values into the database.
Here are the details of my class.
CardHolder.java
package com.spring.book.rental.dao.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
#Entity
#Table(name = "card_holder")
public class CardHolder {
#Id
#Column
#GeneratedValue(generator="SEQ_CARD_HOLDER_ID",strategy=GenerationType.IDENTITY)
#SequenceGenerator(name="SEQ_CARD_HOLDER_ID",
sequenceName="SEQ_PG_CARD_HOLDER_ID",initialValue = 1)
public int id;
#Column(name = "last_name")
public String lastName;
#Column(name = "first_name")
public String firstName;
#Column(name = "card_number")
public String cardNumber;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getCardNumber() {
return cardNumber;
}
public void setCardNumber(String cardNumber) {
this.cardNumber = cardNumber;
}
}
BookController.java
package com.spring.book.rental.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import com.spring.book.rental.DTO.BookDTO;
import com.spring.book.rental.DTO.RentBookRequest;
import com.spring.book.rental.service.BookService;
#RestController
public class BookController {
#Autowired
BookService bookService;
#PostMapping(path="book-rental/rentABook", consumes = "application/json")
public String rentABook(#RequestBody RentBookRequest bookRequest) {
try {
bookService.rentBook(bookRequest);
return "You rented a Book Id : "+bookRequest.getBookId();
} catch (Exception e) {
return e.getMessage();
}
}
}
BookServiceImpl.java
package com.spring.book.rental.service.impl;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import com.spring.book.rental.DTO.BookDTO;
import com.spring.book.rental.DTO.RentBookRequest;
import com.spring.book.rental.dao.BookDAO;
import com.spring.book.rental.dao.CardHolderDAO;
import com.spring.book.rental.dao.RentalDAO;
import com.spring.book.rental.dao.model.Book;
import com.spring.book.rental.dao.model.CardHolder;
import com.spring.book.rental.dao.model.Rental;
import com.spring.book.rental.service.BookService;
#Service("bookService")
#Component
public class BookServiceImpl implements BookService {
#Autowired
BookDAO bookDao;
#Autowired
CardHolderDAO cardHolderDAO;
#Autowired
RentalDAO rentalDAO;
#Override
public void rentBook(RentBookRequest bookRequest) throws Exception {
CardHolder cardHolder = new CardHolder();
cardHolder.setFirstName(bookRequest.getFirstName());
cardHolder.setLastName(bookRequest.getLastName());
cardHolder.setCardNumber(bookRequest.getCardNumber());
cardHolderDAO.addCardHolder(cardHolder);
/* Rental rental = new Rental();
rental.setBook_id(bookRequest.getBookId());
rental.setCardHolder_id(cardHolder.getId());
rentalDAO.addRental(rental); */
}
}
CardHolderDAOImpl.java
package com.spring.book.rental.dao.impl;
import java.math.BigDecimal;
import java.util.List;
import java.util.Optional;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import com.spring.book.rental.dao.CardHolderDAO;
import com.spring.book.rental.dao.model.CardHolder;
import com.spring.book.rental.dao.repository.CardHolderRepository;
#Repository
public class CardHolderDAOImpl implements CardHolderDAO {
#Autowired
CardHolderRepository cardHolderRepository;
#Override
public void addCardHolder(CardHolder cardHolder) {
cardHolderRepository.save(cardHolder);
}
}
CardHolderRepository.java
package com.spring.book.rental.dao.repository;
import java.util.Optional;
import org.springframework.data.repository.CrudRepository;
import com.spring.book.rental.dao.model.CardHolder;
public interface CardHolderRepository extends CrudRepository<CardHolder, Integer> {
public Optional<CardHolder> findById(Integer id);
}
RentBookRequest.java
package com.spring.book.rental.DTO;
public class RentBookRequest {
private int bookId;
private int cardHolderId;
private String firstName;
private String lastName;
private String cardNumber;
public int getBookId() {
return bookId;
}
public void setBookId(int bookId) {
this.bookId = bookId;
}
public int getCardHolderId() {
return cardHolderId;
}
public void setCardHolderId(int cardHolderId) {
this.cardHolderId = cardHolderId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getCardNumber() {
return cardNumber;
}
public void setCardNumber(String cardNumber) {
this.cardNumber = cardNumber;
}
}
Here is the main class
SpringTaskBookRentalApplication.java
package com.spring.book.rental;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import sun.misc.Contended;
#ComponentScan(basePackages = "com")
#EnableAutoConfiguration
#SpringBootApplication
public class SpringTaskBookRentalApplication {
public static void main(String[] args) {
SpringApplication.run(SpringTaskBookRentalApplication.class, args);
}
}
I have added this in the application.properties file
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.url=jdbc:h2:mem:bookrentaldb
spring.datasource.username=admin
spring.datasource.password=admin
spring.h2.console.enabled=true
spring.h2.console.path=/h2
spring.datasource.continue-on-error=false
spring.datasource.initialize=true
spring.datasource.separator=;
spring.datasource.sql-script-encoding=UTF-8
Here is the schema.sql file
create table BOOK(
id int not null primary key,
title varchar(50) not null,
IS_BOOK_AVAILABLE boolean not null,
author varchar(50) not null,
primary key(id)
);
create table card_holder (
id int not null primary key AUTO_INCREMENT,
first_name varchar(20),
last_name varchar(20),
card_number varchar(20),
primary key(id)
);
create table Rental(
rental_id int not null primary key AUTO_INCREMENT,
cardHolder_id int not null,
book_id int not null
);
CREATE SEQUENCE SEQ_PG_CARD_HOLDER_ID MINVALUE 1 MAXVALUE 9999 INCREMENT BY 1 START WITH 1 NOCYCLE ;
CREATE SEQUENCE SEQ_PG_Rental_ID MINVALUE 1 MAXVALUE 999999 INCREMENT BY 1 START WITH 100 NOCYCLE ;
Here is the data.sql
insert into BOOK (id,title,IS_BOOK_AVAILABLE,author) values (101,'A Thousand Splendid Suns','true','Khalid Hosseini');
insert into BOOK (id,title,IS_BOOK_AVAILABLE,author) values (102,'Head First Design Patterns','true','Elisabeth Freeman and Kathy Sierra');
insert into BOOK (id,title,IS_BOOK_AVAILABLE,author) values (103,'Head First Java','true','Book by Bert Bates and Kathy Sierra');
commit;
I have tried several other things with #GeneratedValue
#Id
#Column
#GeneratedValue(strategy=GenerationType.AUTO)
public int id;
This is the stackTrace of error I am getting
java.lang.IllegalArgumentException: After saving the identifier must not be null!
at org.springframework.util.Assert.notNull(Assert.java:198)
at org.springframework.data.jdbc.core.JdbcAggregateTemplate.store(JdbcAggregateTemplate.java:343)
at org.springframework.data.jdbc.core.JdbcAggregateTemplate.save(JdbcAggregateTemplate.java:149)
at org.springframework.data.jdbc.repository.support.SimpleJdbcRepository.save(SimpleJdbcRepository.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.data.repository.core.support.ImplementationInvocationMetadata.invoke(ImplementationInvocationMetadata.java:72)
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:382)
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:205)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:549)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:155)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:130)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:367)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy81.save(Unknown Source)
at com.spring.book.rental.dao.impl.CardHolderDAOImpl.addCardHolder(CardHolderDAOImpl.java:38)
at com.spring.book.rental.dao.impl.CardHolderDAOImpl$$FastClassBySpringCGLIB$$8e01a85d.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
at com.spring.book.rental.dao.impl.CardHolderDAOImpl$$EnhancerBySpringCGLIB$$5a6f1054.addCardHolder(<generated>)
at com.spring.book.rental.service.impl.BookServiceImpl.rentBook(BookServiceImpl.java:68)
at com.spring.book.rental.controller.BookController.rentABook(BookController.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)

You are adding lot of dependencies which you don't need. And when you add a dependency that you don't need, spring boot tries to guess the type of your application and configures accordingly.
I also recommend reading Spring data JPA vs Spring Data JDBC as both are mixed.
1.
public CardHolder addCardHolder(CardHolder cardHolder) {
return cardHolderRepository.save(cardHolder);
}
#Override
public void rentBook(RentBookRequest bookRequest) throws Exception {
CardHolder cardHolder = new CardHolder();
cardHolder.setFirstName(bookRequest.getFirstName());
cardHolder.setLastName(bookRequest.getLastName());
cardHolder.setCardNumber(bookRequest.getCardNumber());
CardHolder saved = cardHolderDAO.addCardHolder(cardHolder);
Rental rental = new Rental();
rental.setBook_id(bookRequest.getBookId());
rental.setCardHolder_id(saved.getId());
rentalDAO.addRental(rental);
}
Your pom should contain only the following. You are currently adding many different dependencies
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
package com.spring.book.rental.dao.model;
import javax.persistence.*;
#Entity
#Table(name = "BOOK")
public class Book {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
public int id;
#Column
public String title;
#Column(name = "IS_BOOK_AVAILABLE")
public boolean isBookAvailable;
#Column
public String author;
...
package com.spring.book.rental.dao.model;
import javax.persistence.*;
#Entity
#Table(name = "card_holder")
public class CardHolder {
#Id
#GeneratedValue(generator="SEQ_CARD_HOLDER_ID",strategy=GenerationType.IDENTITY)
#SequenceGenerator(name="SEQ_CARD_HOLDER_ID", sequenceName="SEQ_PG_CARD_HOLDER_ID",initialValue = 1)
#Column
public int id;
#Column(name = "last_name")
public String lastName;
#Column(name = "first_name")
public String firstName;
#Column(name = "card_number")
public String cardNumber;
....
package com.spring.book.rental.dao.model;
import javax.persistence.*;
import org.springframework.boot.autoconfigure.domain.EntityScan;
#Entity
#Table(name = "Rental")
public class Rental {
#Id
#Column(name = "rental_id")
#GeneratedValue(strategy = GenerationType.AUTO)
public int rentalId;
#Column(name = "cardHolder_id")
public int cardHolder_id;
#Column(name = "book_id")
public int book_id;
....
package com.spring.book.rental.dao.repository;
import com.spring.book.rental.dao.model.Book;
import org.springframework.data.repository.CrudRepository;
import java.util.List;
import java.util.Optional;
public interface BookRepository extends CrudRepository<Book,Integer>{
public List<Book> findAllByIsBookAvailableTrue();
public List<Book> findAll();
public Optional<Book> findById(Integer id);
}
...
Delete schema.sql as it has mistakes and JPA can auto create it.
application properties
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE