Hibernate EntityManager 複合キー

Accounts.java

package com.test;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Accounts {
    AccountsCompoundKey compoundKey;
    private int accountBalance;

    @Id
    public AccountsCompoundKey getCompoundKey() {
        return compoundKey;
    }

    public void setCompoundKey(AccountsCompoundKey compoundKey) {
        this.compoundKey = compoundKey;
    }

    public int getAccountBalance() {
        return accountBalance;
    }

    public void setAccountBalance(int accountBalance) {
        this.accountBalance = accountBalance;
    }
}

AccountsCompoundKey.java

package com.test;

import java.io.Serializable;

import javax.persistence.Embeddable;

@Embeddable
public class AccountsCompoundKey implements Serializable {
    private int userId;
    private int accountId;

    public AccountsCompoundKey(int userId, int accountId) {
        super();
        this.userId = userId;
        this.accountId = accountId;
    }

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    public int getAccountId() {
        return accountId;
    }

    public void setAccountId(int accountId) {
        this.accountId = accountId;
    }
}

AccountsTest.java

package com.test;

import static org.junit.Assert.*;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class AccountsTest {

    static EntityManagerFactory entityManagerFactory;

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        entityManagerFactory = Persistence
                .createEntityManagerFactory("org.hibernate.tutorial.jpa");
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
        entityManagerFactory.close();
    }

    @Before
    public void setUp() throws Exception {

    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void test() {
        EntityManager entityManager = entityManagerFactory.createEntityManager();
        entityManager.getTransaction().begin();
        
        try {
            
            AccountsCompoundKey key1 = new AccountsCompoundKey(100, 10000);
            Accounts account1 = new Accounts();
            account1.setCompoundKey(key1);
            account1.setAccountBalance(8000);
            
            entityManager.persist(account1);
            
            AccountsCompoundKey key2 = new AccountsCompoundKey(200, 20000);
            Accounts account2 = new Accounts();
            account2.setCompoundKey(key2);
            account2.setAccountBalance(9000);
            
            entityManager.persist(account2);
            entityManager.getTransaction().commit();
        }
        catch (Exception e) {
            entityManager.getTransaction().rollback();
        }
    }
}