JPA/HSQLDB Persistence class not found error - java

I'm pretty new to JPA and HSQLDB, and I'm havin a weird error when I'm trying to create my EntityManagerFactory. Its a Web Dynamic project in Eclipse (with Tomcat 6.0 as web server) and I imported all the libraries in the the WEB-INF/lib. I'm trying to create the Entity manager Factory in a servlet but in just gives me a class not found exception on the line
emf = Persistence.createEntityManagerFactory("manager1");
Here is the code I used in my servlet:
package view;
import java.io.IOException;
import javax.persistence.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.ThemeLivre;
public class AjouterTheme extends HttpServlet {
//private static final long serialVersionUID = 1L;
#PersistenceUnit(unitName ="DB")
private EntityManagerFactory emf;
public AjouterTheme() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
emf = Persistence.createEntityManagerFactory("DB");
EntityManager em = emf.createEntityManager();
String nomTheme = request.getParameter("nomtheme");
String descTheme = request.getParameter("desctheme");
EntityTransaction tx = em.getTransaction();
tx.begin();
ThemeLivre thml = new ThemeLivre(nomTheme, descTheme);
em.persist(thml);
tx.commit();
}
}
Here is my persistence.xml
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="DB" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/DefaultDS</jta-data-source>
<class>model.ThemeLivre</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="hibernate.connection.url" value="jdbc:hsqldb:hsql://localhost/"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
<property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver"/>
<property name="javax.persistence.jdbc.user" value="sa"/>
<property name="javax.persistence.jdbc.password" value=""/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.show_sql" value="true"/>
</properties>
Please tell me what I did wrong, or if there is something I can do.
Thank you


In your servlet code you used
#PersistenceUnit(unitName ="DB")
private EntityManagerFactory emf;
but you declare
<persistence-unit name="manager1" transaction-type="RESOURCE_LOCAL">
change either the one or the other persistence unit name.
Following your input above
Try to add the hibernate persistence provider lib. You add only the specification (API). The implementation itself (hibernate) is needed, to create an Entity Manager.

Related

Java EntityManager throwing NullPointerException

When I try to run the Unit test for this DAO class, I am getting NullPointerException at getById return statement. I know that the class does not initialize the EntityManager, but I don’t understand why? - I can’t tell whether my persistence.xml configuration is wrong or the DB credentials are incorrect.
I saw two or more StackOverflow threads but had had little luck. I am using Intellij IDE.
package com.beetlehand.model.dao;
import com.beetlehand.model.AttributeEntity;
import org.apache.commons.lang.StringUtils;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;
import java.util.List;
import java.util.Map;
import java.util.ArrayList;
#Stateless
public class AttributeDao extends AbstractDao<AttributeEntity> {
#PersistenceContext(unitName = "NewPersistenceUnit")
protected EntityManager entityManager;
public AttributeEntity getById(Long id) {
if(id == null) return null;
return entityManager.find(AttributeEntity.class, id);
}
/*** more code ***/
}
Persistence configuration file
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
<persistence-unit name="NewPersistenceUnit">
<class>com.beetlehand.model.AttributeEntity</class>
<class>com.beetlehand.model.AttributeValueEntity</class>
<class>com.beetlehand.model.AuditEntity</class>
<class>com.beetlehand.model.CategoryEntity</class>
<class>com.beetlehand.model.CustomerEntity</class>
<class>com.beetlehand.model.DepartmentEntity</class>
<class>com.beetlehand.model.OrderDetailEntity</class>
<class>com.beetlehand.model.OrdersEntity</class>
<class>com.beetlehand.model.ProductEntity</class>
<class>com.beetlehand.model.ProductAttributeEntity</class>
<class>com.beetlehand.model.ProductCategoryEntity</class>
<class>com.beetlehand.model.ReviewEntity</class>
<class>com.beetlehand.model.ShippingEntity</class>
<class>com.beetlehand.model.ShippingRegionEntity</class>
<class>com.beetlehand.model.ShoppingCartEntity</class>
<class>com.beetlehand.model.TaxEntity</class>
<properties>
<property name="toplink.jdbc.url" value="jdbc:mysql://localhost:3306/beetlehand"/>
<property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/beetlehand"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/beetlehand"/>
<property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver"/>
<property name="eclipselink.jdbc.url" value="jdbc:mysql://localhost:3306/beetlehand"/>
<property name="eclipselink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.username" value="username"/>
<property name="hibernate.connection.password" value="password"/>
</properties>
</persistence-unit>
</persistence>

You need to mock the entityManager then you need to do stub for entityManager.find() as shown below.
#Mock // Mocking enitt
private EntityManager entityManager;
public AttributeEntity entity = new AttributeEntity();
// Stubbing for entityManager.find()
Mockito.when(entityManager.find(Mockito.any(AttributeEntity.class), Mockito.any())).thenReturn(entity);

Provider org.hibernate.envers.event.EnversIntegrator not a subtype error in CDI+JPA2.1+Restful

I am trying to call JPA from a rest web service. but it throws me
org.hibernate.integrator.spi.Integrator: Provider org.hibernate.envers.event.EnversIntegrator not a subtype at org.apache.cxf.service.invoker.AbstractInvoker.createFault(AbstractInvoker.java:170) at
org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:136) at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:204) at
org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:101) at
org.apache.openejb.server.cxf.rs.AutoJAXRSInvoker.invoke(AutoJAXRSInvoker.java:68) at org.apache.cxf.interceptor.ServiceInvokerInterceptor
I have used maven 4, JPA 2.1, CDI.
My code:
JPA part:
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("defaultMainUnit", null);
EntityManager entityManager = entityManagerFactory.createEntityManager();
Persistence.generateSchema("defaultMainUnit", null);
Query master Query = entityManager
.createNamedQuery("master.findAll");
List<Master > masterList = masterQuery.getResultList();
for(Master master : masterList){
System.out.println("Master id: "+master .getMaster TrackingId());
}
entityManager.clear();
entityManager.close();
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="defaultMainUnit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>core.Master</class>
<class>core.Child</class>
<properties>
<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" />
<property name="hibernate.connection.url" value="jdbc:hsqldb:mem:defaultDB" />
<property name="hibernate.connection.username" value="sa" />
<property name="hibernate.connection.password" value="" />
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
<property name="hibernate.connection.release_mode" value="after_statement"/>
<!-- insert data using sql file -->
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
<property name="javax.persistence.schema-generation.create-source" value="metadata"/>
<property name="javax.persistence.schema-generation.drop-source" value="metadata"/>
<property name="javax.persistence.sql-load-script-source" value="mcb-test-import.sql"/>
</properties>
</persistence-unit>
Restservice:
package restcdi.rest;
#Path("/")
public class GreetREST {
#Inject
private EnglishGreet greet;
#GET
#Path("/greet")
#Produces(MediaType.TEXT_PLAIN)
public String greet() {
return greet.greet();
}
#GET
#Path("/master")
#Produces(MediaType.APPLICATION_JSON)
public List master() throws FileNotFoundException, IOException{
CheckJPAProperties check = new CheckJPAProperties();
List masterList = check.runMe();
return masterList;
}
}
in the above code, runMe() returns all the masters in database using JPA code above. when i run the JPA code without a rest service in main it runs fine and returns everything. I am not sure what I am missing. I tried including the hibernate-envers dependency in pom.xml but it still throws the same error.
please help.
ps: just in case this is needed i am including my applicationConfig
package restcdi.rest;
import java.util.Set;
import javax.ws.rs.core.Application;
#javax.ws.rs.ApplicationPath("rest")
public class ApplicationConfig extends Application {
#Override
public Set<Class<?>> getClasses() {
Set<Class<?>> resources = new java.util.HashSet<>();
resources.add(GreetREST.class);
return resources;
}
}

eclipselink Persistence error and not well formed xml document

getting this error in eclipselink JPA example. I am trying to set up a simple JPA class. It complains about the xml document not being well formed, but I don't see any problems. please let me know of any pointers. thanks!
Main class is:
package de.vogella.jpa.simple.main;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
import de.vogella.jpa.simple.model.Todo;
public class Main {
private static final String PERSISTENCE_UNIT_NAME = "todos";
private static EntityManagerFactory factory;
public static void main(String[] args) {
factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
EntityManager em = factory.createEntityManager();
// read the existing entries and write to console
Query q = em.createQuery("select t from Todo t");
List<Todo> todoList = q.getResultList();
for (Todo todo : todoList) {
System.out.println(todo);
}
System.out.println("Size: " + todoList.size());
// create new todo
em.getTransaction().begin();
Todo todo = new Todo();
todo.setSummary("This is a test");
todo.setDescription("This is a test");
em.persist(todo);
em.getTransaction().commit();
em.close();
}
}
here is persistence.xml
<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="todos" transaction-type="RESOURCE_LOCAL">
<class>de.vogella.jpa.simple.model.Todo</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:derby:/home/vogella/databases/simpleDb;create=true" />
<property name="javax.persistence.jdbc.user" value="test" />
<property name="javax.persistence.jdbc.password" value="test" />
<!-- EclipseLink should create the database schema automatically -->
<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode"
value="database" />
</properties>
</persistence-unit>
</persistence>
The error is the following:
Exception in thread "main" Local Exception Stack:
Exception [EclipseLink-30009] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while trying to load persistence unit at url: file:/C:/paul/oneView/java/de.vogella.jpa.simple/build/eclipse/
Internal Exception: Exception [EclipseLink-30004] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while processing persistence.xml from URL: file:/C:/paul/oneView/java/de.vogella.jpa.simple/build/eclipse/
Internal Exception:
(1. The markup in the document preceding the root element must be well-formed.)
at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionLoadingFromUrl(PersistenceUnitLoadingException.java:100)
at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processPersistenceArchive(PersistenceUnitProcessor.java:597)
at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.getPersistenceUnits(PersistenceUnitProcessor.java:481)
at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.findPersistenceUnitInfoInArchive(JPAInitializer.java:172)
at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.findPersistenceUnitInfoInArchives(JPAInitializer.java:154)
at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.findPersistenceUnitInfo(JPAInitializer.java:135)
at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:177)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at de.vogella.jpa.simple.main.Main.main(Main.java:17)

No Persistence provider for EntityManager named DataSourcePostgres

I receive the following error in my standalone java application:
Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named DataSourcePostgres
Here's my persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="DataSourcePostgres">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>Denarnica</class>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.ProgressDialect"/>
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
<!--<property name="hibernate.show_sql" value="true"/>-->
<property name="hibernate.connection.username" value="*****"/>
<property name="hibernate.connection.password" value="*******"/>
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/postgres"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>
</persistence>
and here's my Server.java:
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
import java.util.List;
public class Server {
private static final String PERSISTENCE_UNIT_NAME = "DataSourcePostgres";
private static EntityManagerFactory factory;
public static void main(String[] args) {
factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
EntityManager em = factory.createEntityManager();
// Read the existing entries and write to console
Query q = em.createQuery("select d from Data d");
List<Denarnica> dataList= q.getResultList();
System.out.println("Size: " + dataList.size());
}
}
I've been looking at some similar problems, but the solutions people suggested to them don't seem to help me. Any advice?

My problem was I didn't put the persistence.xml into a META-INF folder. After I fixed that everything worked.

how to call stored procedure with multiple in and out parameters using entity manager

We are facing an issue while calling the stored procedure from the application.
The database is oracle 10g
This proc has 2 input parameters and 2 output parameters.
Input 1:- DB-List
Input 2:- String
Output 1:-Again a DB-List
Output 2:- Number
When we are trying to use
Query q = session.createSQLQuery("{call proc_name(?,?,?,?)}");
We cannot distinguish between in parameters and out parameters.
So how should we handle it by using this.
Also,
We tried to use callable statement as follows:
Session session = (Session) getEntityManager().getDelegate();
SessionImpl sessionImpl = ((SessionImpl) getEntityManager().getDelegate());
Connection cc = sessionImpl.connection();
CallableStatement callableStatement = null;
callableStatement = cc.prepareCall("{call proc_name(?,?,?,?)}");
ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("DB_LIST",callableStatement.getConnection());
ARRAY paramArray = new ARRAY(descriptor, callableStatement.getConnection(), array);
callableStatement.setArray(1, paramArray);
callableStatement.setString(2, "N");
callableStatement.registerOutParameter(3, OracleTypes.ARRAY, "DB_RETURN_LIST");
callableStatement.registerOutParameter(4, Types.INTEGER);
// executing the query
callableStatement.execute();
We get the following error:
javax.ejb.EJBException: java.lang.ClassCastException:
$Proxy50 cannot be cast to oracle.jdbc.OracleConnection
Can you please provide some suggestions.
This is the Entity Manager that we are using
public abstract class GenericDAO<T, ID extends Serializable> implements IGenericDAO<T, ID> {
private final Class<T> persistentClass;
#PersistenceContext(unitName = "firstPersistenceUnit")
#Produces
private EntityManager entityManager;
public void setEntityManager(final EntityManager entityManager) throws DataAccessException {
this.entityManager = entityManager;
}
public EntityManager getEntityManager() throws DataAccessException {
return entityManager;
}
}
Here is the entry in the Persistance.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="firstPersistenceUnit">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:jboss/firstDataSource</jta-data-source>
<class>com.domain.Branch</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<validation-mode>AUTO</validation-mode>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
</properties>
</persistence-unit>
<persistence-unit name="secondPersistenceUnit">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:jboss/secondDataSource</jta-data-source>
<class>com.domain.PocJeeCounty</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<validation-mode>AUTO</validation-mode>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
</properties>
</persistence-unit>
</persistence>

Dont use second way, instead create and define query and query parameters using #NamedStoredProcedureQuery and #StoredProcedureParameter. Following is the code for your requirement
#NamedStoredProcedureQuery(
name="PROC_NAME",
procedureName="proc_name",
returnsResultSet=true/false,
parameters={
#StoredProcedureParameter(queryParameter="param1",name="p1",direction=Direction.IN,type=Integer.class),
#StoredProcedureParameter(queryParameter="param2",name="p2",direction=Direction.IN,type=Timestamp.class),
#StoredProcedureParameter(queryParameter="param3",name="p3",direction=Direction.OUT,type=String.class),
#StoredProcedureParameter(queryParameter="param4",name="p4",direction=Direction.OUT,type=Integer.class)
}
)
and use em.createNativeQuery() method

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