EntityManager lock overrides changes done to a managed entity

[vseibt]

EntityManager lock overrides changes done to a managed entity

If using EntityManager#lock with a managed entity with LockModeType.PESSIMISTIC_WRITE all
previous changes to this managed entity (by merge or setters) are lost.

To Reproduce

Excerpt from test case

            em.getTransaction().begin();
            TestEntityMaster testMaster = em.find(TestEntityMaster.class, ID);
            testMaster.setName("new name");
            em.lock(testMaster, LockModeType.PESSIMISTIC_WRITE);
            assertEquals("new name", testMaster.getName());
            em.getTransaction().commit();

Assertion fails.

• EclipseLink version 4.0.2
• Java/JDK version 17

Expected behavior
Lock should not override content already changed in the managed entity (assertion in above code should not fail).

Additional context
See class TestBug.java in branch "bug-entitymanager-lock" in repository git@github.com:vseibt/eclipselink-jpa-testcase-202402.git

Note
Test project in the above repo was created using
mvn archetype:generate -DarchetypeGroupId=org.eclipse.persistence -DarchetypeArtifactId=org.eclipse.persistence.bug.jpa-archetype -DarchetypeVersion=5.0.0-SNAPSHOT -DgroupId=eclipselink.bug.testcase -DartifactId=jpa-testcase

like suggested.

Unfortunately current version of this plugin does not have parameters for groupId and artifactId, leading to group id and artifact id from the archetype being used.