Bdtjtk

I am trying to add a participantRepository interface (which implements CrudRepository) to my spring boot application. But the basic code for this interface gives an error when it is run saying that the classpath of the application must be corrected. How can I do this and is there another modification I can do to run the code correctly?

//Participant class

package com.example.spring2.participants;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.*;



import javax.persistence.Entity;

import javax.persistence.Id;

import java.util.List;



@Entity

public class Participant {



    @Id

    private String name;

    private int age;

    private String job;



    @Autowired

    private ParticipentService participentService;



    public Participant() {

    }



    public Participant(String name, int age, String job) {

        this.name = name;

        this.age = age;

        this.job = job;

    }



    public String getName() {

        return name;

    }



    public void setName(String name) {

        this.name = name;

    }



    public int getAge() {

        return age;

    }



    public void setAge(int age) {

        this.age = age;

    }



    public String getJob() {

        return job;

    }



    public void setJob(String job) {

        this.job = job;

    }



}

//ParticipantController class

package com.example.spring2.participants;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.*;



import java.util.List;



@RestController

public class ParticipantController {





    @Autowired

    private ParticipentService participentService;





    @RequestMapping("/people")

    public List<Participant> viewPeople(){

        return participentService.getParticipants();

    }



    @RequestMapping("/people/{name}")

    public Participant getAParticipant(@PathVariable String name) {

        return participentService.getAParticipant(name);

    }



    @RequestMapping(method = RequestMethod.POST, value = "/people")

    public void addParticipant(@RequestBody Participant participant){

        participentService.addParticipant(participant);

    }



    @RequestMapping(method = RequestMethod.PUT, value = "/people/{name}")

    public void updateParticipant(@RequestBody Participant participant, @PathVariable String name) {

        participentService.updateParticipant(participant, name);

    }



    @RequestMapping(method = RequestMethod.DELETE, value = "/people/{name}")

    public void deleteParticipant(@PathVariable String name) {

        participentService.deleteParticipant(name);

    }



}

//ParticipantService class

package com.example.spring2.participants;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;



import java.util.Arrays;

import java.util.List;



@Service

public class ParticipentService {



    private List<Participant> participantList = Arrays.asList(

        new Participant("yasas", 23, "Student"),

        new Participant("anu", 28, "accountant"),

        new Participant("banu", 26, "teacher")

    );



    @Autowired

    private ParticipantRepository participantRepositoty;





    public List<Participant> getParticipants(){



        return participantList;

    }



    public void addParticipant(Participant participant) {

        participantList.add(participant);



    }



    public void updateParticipant(Participant participant, String name ){

        for (int i=0; i < participantList.size(); i++){

            Participant p = participantList.get(i);

            if (p.getName().equals(name)){

                participantList.set(i, participant);

                return;

            }

        }

    }



    public void deleteParticipant(String name ){

        for (int i=0; i < participantList.size(); i++){

            Participant p = participantList.get(i);

            if (p.getName().equals(name)){

                participantList.remove(p);

            }

        }

    }



    public Participant getAParticipant(String name) {

        for (int i=0; i < participantList.size(); i++){

            Participant p = participantList.get(i);

            if (p.getName().equals(name)){

                return p;

            }

        }

        return  null;

    }

}

//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 http://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>2.1.1.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

        <groupId>com.example</groupId>

        <artifactId>spring2</artifactId>

        <version>0.0.1-SNAPSHOT</version>

        <name>spring2</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-data-jpa</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>



        <dependency>

            <groupId>org.apache.derby</groupId>

            <artifactId>derby</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>



        <dependency>

            <groupId>javax.xml.bind</groupId>

            <artifactId>jaxb-api</artifactId>

            <version>2.3.0</version>

        </dependency>



    </dependencies>



    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>



</project>

I expected the server to be started when the application is run. But it gives following error.

Description:



An attempt was made to call the method javax.persistence.PersistenceContext.synchronization()Ljavax/persistence/SynchronizationType; but it does not exist. Its class, javax.persistence.PersistenceContext, is available from the following locations:



    jar:file:/C:/Users/Asus/.m2/repository/org/hibernate/javax/persistence/hibernate-jpa-2.0-api/1.0.1.Final/hibernate-jpa-2.0-api-1.0.1.Final.jar!/javax/persistence/PersistenceContext.class

    jar:file:/C:/Users/Asus/.m2/repository/org/hibernate/javax/persistence/hibernate-jpa-2.1-api/1.0.0.Final/hibernate-jpa-2.1-api-1.0.0.Final.jar!/javax/persistence/PersistenceContext.class



It was loaded from the following location:



    file:/C:/Users/Asus/.m2/repository/org/hibernate/javax/persistence/hibernate-jpa-2.0-api/1.0.1.Final/hibernate-jpa-2.0-api-1.0.1.Final.jar



Action:



Correct the classpath of your application so that it contains a single, compatible version of javax.persistence.PersistenceContext

first remove in your repository maven the directory hibernate and then make a maven clean install to reimport correctly your dependencies.
if it still doesn't fix your problem make a maven tree:dependency to detect what dependence import the hibernate-jpa-2.0-api and exclude it in your pom