I'm currently learning how to code my own backend server with Spring Boot. Said server should retrieve values from a MongoDB collection and display them as JSON data inside the browser. So, I initalized myself a template project (not the MongoDB one) with Spring Initializer, added some additional dependencies to the pom file and added the data/mongo dependencies and started to go trough the tutorials. Everything is working fine, except one thing: I can't retrieve any data by their corresponding ObjectId. Before I show you the code, I'll explain you how my environment setup looks like:
Machine: Windows 10 Home Edition 64-Bit
IDE: Eclipse 2019-12 CDT with the Java and M2E plugin as well as the Spring Tools
JDK Version: JDK 13
MongoDB Version: 4.2.3
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema- instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>mybackend</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>mybackend</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>13</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Person.java
package com.example.mybackend;
import org.springframework.data.annotation.Id;
public class Person
{
#Id private String Id;
private String firstName;
private String lastName;
public String getfirstName()
{
return firstName;
}
public String getlastName()
{
return lastName;
}
public void setfirstName(String updatedfirstName)
{
firstName = updatedfirstName;
}
public void setlastName(String updatedlastName)
{
lastName = updatedlastName;
}
}
PersonRepository.java
package com.example.mybackend;
import java.util.List;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
#RepositoryRestResource(collectionResourceRel="person",path="person")
public interface PersonRepository extends MongoRepository<Person,String>
{
List<Person> findByLastName(#Param("name") String name);
}
I've excluded the MyBackendApplication.java file on purpose due to the fact, that it wasn't modified at any point. My main problem occurs when I make a "GET" request to the URI "http://localhost:8080/person/ObjectId" (ObjectId is the _id value inside of MongoDB as a String). The result is a blank webpage and the hint inside my browser that the request for the collection has returned an 404 error. However, according to the tutorials instruction this shouldn't happen. I've also tested the same step with curl without any success.
UPDATE:
I could resolve my issue by changing the identifier of my Id to id instead of Id. I'll update this response if I get further information.
Related
I am new to spring-boot and I am following freecodecamp's tutorial and there the tutor imported #NotBlank, I am trying to import it from org.springframework.boot but it is not working.
Can anyone tell me how to import #NotBlank.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>learning-spring</name>
<description>Trying to learn</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
<dependency>
<groupId>org.jetbrains</groupId>
<artifactId>annotations</artifactId>
<version>20.1.0</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
This is pom.xml and I have added org.springframework.boot in the dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
I don't know how to import it into my code?
This is my code, help me out.
package com.example.demo.model;
import com.fasterxml.jackson.annotation.JsonProperty;
import java.util.UUID;
public class Person
{
private final UUID id;
#NotBlank
private final String name;
public Person(#JsonProperty("id")UUID id,
#JsonProperty("name") String name)
{
this.id = id;
this.name = name;
}
public UUID getId()
{
return id;
}
public String getName()
{
return name;
}
}
Thanks in advance.
From Spring Boot 3.0.0 it uses Java 17. In Java 17 the location of of validators has moved from javax.validation to jakarta.validation - see Bug: Spring Boot 3.0.0-M1 cannot find javax.validation#2953 - not really a bug.
Your options are to stay with spring-boot-starter-parent v3.0.2 (jdk17) and use the following import:
import jakarta.validation.constraints.NotBlank;
Or to drop spring-boot-starter-parent to a version before 3.0.0, eg 2.7.8 and use the following import. I recomment this unless you really need Java17.
import javax.validation.constraints.NotBlank;
The following import should work:
import javax.validation.constraints.NotBlank;
I'm new to spring boot and trying to learn how to implement graphql. #GetMapping and #PostMapping work as normal but when I try to use #QueryMapping or #SchemaMapping, following the Spring documentation I get the whitelabel error page. Playing around I'm able to guess that it's not recognizing these two as mapping. I've checked my dependencies but I'll include them below in case, I've verified the project structure, and I've also tried changing from #Controller to #RestController to no avail.
Controller file
package com.example.GraphQLBooks.controller;
import com.example.GraphQLBooks.model.Book;
import com.example.GraphQLBooks.repository.BookRepository;
import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.graphql.data.method.annotation.SchemaMapping;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
#RestController
public class BookController {
private final BookRepository bookRepository;
public BookController(BookRepository bookRepository) {
this.bookRepository = bookRepository;
}
//This works with #RestController but breaks with #Controller
#GetMapping("/test")
public String controllerTest(){
return "Hello";
}
//#SchemaMapping(typeName = "Query",value = "allBooks")
#QueryMapping
public List<Book> findAll() {
return bookRepository.findAll();
}
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>GraphQL-Books</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>GraphQL-Books</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-graphql</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webflux</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.graphql</groupId>
<artifactId>spring-graphql-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-java</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
application.properties
spring.graphql.graphiql.enabled=true
I tested the repositories using #GetMapping and they output as expected and when I got to my "/test" mapping it outputs Hello as expected. Any insight and tips are appreciated, and let me know if more info is needed.
Figured it out. My schema had a typo had schema.graphql instead of schema.graphqls and it should be localhost:8080/graphiql not localhost:8080/graphql dumb mistakes I know. And you can't use #RestController with graphql has to be #Controller which makes sense because we're not using a Rest Api.
Had similar issue. The problem was graphqls file wasn't placed in the right folder.
Spring boot graphQL looks for the graphqls file in the following directory by default: ~/src/main/resources/graphql/schema.graphqls
I haven't used spring in a while, and I'm trying to get spring boot dev tools to perform hot reloading. I've imported the web and spring boot dependencies from start.spring.io project generator and made a uri for "/hello". I can run the project but changing the uri values doesn't hot reload and I don't believe that the hot reloading is working. From what I've found on searching the internet, the only necessary step is to add the hot reloading dependency in your pom file:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
My entire pom.xml file is as follows (generated from the start.spring.io website):
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.java</groupId>
<artifactId>java_app</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>java_app</name>
<description>Web Project</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
And my web uri file is as follows (works, but without hot reloading):
package com.java.java_app;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
#SpringBootApplication
#RestController
public class JavaAppApplication {
public static void main(String[] args) {
SpringApplication.run(JavaAppApplication.class, args);
}
#GetMapping("/hello")
public String hello(#RequestParam(value = "name", defaultValue = "World") String name){
return String.format("Hello %s!", name);
}
}
This is as simple an application as I think it is possible to build, so I'm confused on what extra necessary step is needed to make hot reloading work. It does not appear to be documented say here (https://www.baeldung.com/spring-boot-devtools) other than to add the dependency. If it matters I'm running ubuntu 20.04.
EDIT:
I am running the application in the terminal on port :8080 and using vim to modify the uri file while the application is running. Since java has a lot of plugins for various IDEs someone suggested that it is worth mentioning that.
If you are not using an IDE you can use ./mvnw compile and the project will recompile while the editor is running.
https://github.com/hardikSinghBehl/jokes-app
The Project Structure
Pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.hardik</groupId>
<artifactId>chuck-norris-jokes-app</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Spring-Boot-chuck-norris-jokes-app</name>
<description>Project using spring boot and actuator to create a jokes application</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
<dependency>
<groupId>guru.springframework</groupId>
<artifactId>chuck-norris-for-actuator</artifactId>
<version>0.0.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Controller class
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import com.hardik.chucknorrisjokesapp.services.JokeService;
#Controller
public class JokeController {
private JokeService jokeService;
public JokeController() {
super();
}
#Autowired
public JokeController(JokeService jokeService) {
super();
this.jokeService = jokeService;
}
#RequestMapping({"/",""})
public String showJoke(Model model){
model.addAttribute("joke", jokeService.getJoke());
return "chucknorris";
}
}
Service class
import org.springframework.stereotype.Service;
import guru.springframework.norris.chuck.ChuckNorrisQuotes;
#Service
public class ChuckNorrisJokeService implements JokeService{
private ChuckNorrisQuotes chuckNorrisQuotes;
public ChuckNorrisJokeService() {
super();
this.chuckNorrisQuotes = new ChuckNorrisQuotes();
}
public ChuckNorrisJokeService(ChuckNorrisQuotes chuckNorrisQuotes) {
super();
this.chuckNorrisQuotes = chuckNorrisQuotes;
}
#Override
public String getJoke(){
return chuckNorrisQuotes.getRandomQuote();
}
}
code works fine, i don't get any error, but when i go to localhost, the 404 error message is displayed
ChuckNorrisQuotes class is available in jar file added in dependencies
have attatched my git repository for this project, have tried everything and i am stuck, tried getMapping annotation, tried #getParam
when i am using #RestComponent, then local host is returning "chucknorris" as a String on screen rather than the html file in resources/templates
I am beginner for spring boot. I initialized a new project and tried to run it but it does not work successfully. WHen I run this as spring boot application, it starts execution. In bottom compiler/status bar, it shows processing and retrying. it goes upto 10 times and throw the following error:
Failed to refresh live data from process xxxx
More detail here
TanmayTestApplication.java
package com.example.tanmay_test;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class TanmayTestApplication {
public static void main(String[] args) {
SpringApplication.run(TanmayTestApplication.class, args);
}
}
DemoControler.java
package com.example.cntr;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
#RestController
public class DemoControler {
#RequestMapping(path = "/index")
public String index() {
return "By Tanmay!";
}
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>tanmay_test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>tanmay_test</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
I had the same problem in STS, and tried different things to resolve it. The following dependency for spring actuator makes that problem disappear, but however the main point of spring actuator provides more features than this. To learn more, click https://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-features.html
The dependency should be added to your pom.xml file
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
I have faced the same problem but managed to solve it.
The controller class has to be in the "child package" relative to the TestApplication class.
In your case, your TanmayTestApplication class is in the package com.example.tanmay_test. Therefore, your DemoControler class must be inside the package com.example.tanmay_test.xxx.
**Note that xxx can be anything but extends from package com.example.tanmay_test. For example, package com.example.tanmay_test.web.
Hope this helps!
Add this line in your file application.properties (src/main/resources):
spring.devtools.livereload.enabled=true
Live data is collected with the help of Spring Actuator.
You need to include the following dependency in your pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
See https://github.com/spring-projects/sts4/wiki/Live-Application-Information#application-requirements-for-spring-boot-projects for reference.
I was also facing same issue after adding Spring Actuator dependency, it resolved.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
after adding this in POM.xml, do maven build and run again.
It is simply saying that you didn't enable LiveReload.
This is non other then the Data Source error
To resolves this I disabled the auto-configuration of the DataSource. And, this will not affect auto-configuring any other beans.
#SpringBootApplication(exclude = {DataSourceAutoConfiguration.class })
I'm using VS Code and the thing that worked for me was adding a dev tool dependency.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
Also, add spring.devtools.livereload.enabled=true in application.properties file so that server knows that it has to reload every time a change is made.
Thanks for this one.