package org.hibernate.bugs.entities;

import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;
import jakarta.persistence.Version;
import org.hibernate.annotations.OptimisticLockType;
import org.hibernate.annotations.OptimisticLocking;

@Entity
@OptimisticLocking(type = OptimisticLockType.NONE)
public class Example {
    @Id
    @GeneratedValue
    private Long id;

    private String name;

    @Version
    private Long rowVersion;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Long getRowVersion() {
        return rowVersion;
    }

    public void setRowVersion(Long rowVersion) {
        this.rowVersion = rowVersion;
    }
}

package org.hibernate.bugs;

import jakarta.persistence.EntityManager;
import jakarta.persistence.EntityManagerFactory;
import jakarta.persistence.Persistence;

import org.hibernate.bugs.entities.Example;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

/**
 * This template demonstrates how to develop a test case for Hibernate ORM, using the Java Persistence API.
 */
public class JPAUnitTestCase {

	private EntityManagerFactory entityManagerFactory;

	@Before
	public void init() {
		entityManagerFactory = Persistence.createEntityManagerFactory( "templatePU" );
	}

	@After
	public void destroy() {
		entityManagerFactory.close();
	}

	// Entities are auto-discovered, so just add them anywhere on class-path
	// Add your tests, using standard JUnit.
	@Test
	public void hhh123Test() throws Exception {
		EntityManager entityManager = entityManagerFactory.createEntityManager();

		// Transaction 1 - create entity
		entityManager.getTransaction().begin();

		// Create new entity
		Example example = new Example();
		example.setName("Example1");
		entityManager.persist(example);

		Long exampleId = example.getId();
		entityManager.getTransaction().commit();
		entityManager.close();
		entityManager = entityManagerFactory.createEntityManager();

		// Transaction 2 - update entity
		entityManager.getTransaction().begin();
		Example example2 = entityManager.find(Example.class, exampleId);
		example2.setName("Example2");
		entityManager.merge(example2);

		entityManager.getTransaction().commit();
		entityManager.close();
		entityManager = entityManagerFactory.createEntityManager();

		// Transaction 3 - update stale entity
		entityManager.getTransaction().begin();

		example.setName("Example3");

		// This should not throw a StaleObjectStateException but does
		entityManager.merge(example);

		entityManager.getTransaction().commit();

		entityManager.close();
	}
}