Message Title

The attached (simple) test-case triggers a NullPointerException when creating the 2nd-level cache key for an entity in EntityUpdateAction.doAfterTransactionCompletion.
The bug seems to be present since DelayedPostInsertIdentifier handling changed in
HHH-11019 Closed .
In previous versions (5.2.x), DelayedPostInsertIdentifiers were not used in this use-case.
The root-cause of the problem seems to be that org.hibernate.action.internal.EntityAction#getId will return null in some use-cases, but org.hibernate.cache.spi.support.AbstractEntityDataAccess#generateCacheKey cannot handle that.
org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction

	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:541)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714)
	at org.springframework.test.context.transaction.TransactionContext.endTransaction(TransactionContext.java:131)
	at org.springframework.test.context.transaction.TestTransaction.end(TestTransaction.java:135)
	at org.example.testcase.TestcaseApplicationTests.failsOnCommit(TestcaseApplicationTests.java:30)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: javax.persistence.RollbackException: Error while committing the transaction
	at org.hibernate.internal.ExceptionConverterImpl.convertCommitException(ExceptionConverterImpl.java:81)
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101)
	at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532)
	... 35 more
Caused by: org.hibernate.AssertionFailure: Exception releasing cache locks
	at org.hibernate.engine.spi.ActionQueue$AfterTransactionCompletionProcessQueue.afterTransactionCompletion(ActionQueue.java:990)
	at org.hibernate.engine.spi.ActionQueue.afterTransactionCompletion(ActionQueue.java:513)
	at org.hibernate.internal.SessionImpl.afterTransactionCompletion(SessionImpl.java:2501)
	at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.afterTransactionCompletion(JdbcCoordinatorImpl.java:479)
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.afterCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:198)
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$400(JdbcResourceLocalTransactionCoordinatorImpl.java:39)
	at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:273)
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:98)
	... 36 more
Caused by: java.lang.NullPointerException
	at org.hibernate.type.descriptor.java.AbstractTypeDescriptor.extractHashCode(AbstractTypeDescriptor.java:78)
	at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:204)
	at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:209)
	at org.hibernate.cache.internal.CacheKeyImplementation.calculateHashCode(CacheKeyImplementation.java:57)
	at org.hibernate.cache.internal.CacheKeyImplementation.<init>(CacheKeyImplementation.java:53)
	at org.hibernate.cache.internal.DefaultCacheKeysFactory.staticCreateEntityKey(DefaultCacheKeysFactory.java:50)
	at org.hibernate.cache.internal.DefaultCacheKeysFactory.createEntityKey(DefaultCacheKeysFactory.java:76)
	at org.hibernate.cache.spi.support.AbstractEntityDataAccess.generateCacheKey(AbstractEntityDataAccess.java:40)
	at org.hibernate.action.internal.EntityUpdateAction.doAfterTransactionCompletion(EntityUpdateAction.java:319)
	at org.hibernate.engine.spi.ActionQueue$AfterTransactionCompletionProcessQueue.afterTransactionCompletion(ActionQueue.java:983)
	... 43 more