Natural-id : NullPointerException after persisting null String value, if using @NaturalIdCache ---------------------------------------------------------------------------------------------- Key: HHH-7236 URL: https://hibernate.onjira.com/browse/HHH-7236 Project: Hibernate ORM Issue Type: Bug Components: caching (L2), core Affects Versions: 4.1.2 Reporter: Guenther Demetz Assignee: Strong Liu Fix For: 4.1.3 Original Estimate: 0.5h Remaining Estimate: 0.5h Following new matrix testmethod {code:title=org.hibernate.test.naturalid.mutable.cached.CachedMutableNaturalIdTest.java|borderStyle=solid} @Test public void testNaturalIdPersistNullValue() { Session session = openSession(); session.beginTransaction(); Another it = new Another(); it.setName(null); session.save( it ); session.getTransaction().commit(); // throws NPE session.close(); } {code} raises: java.lang.NullPointerException at org.hibernate.type.descriptor.java.AbstractTypeDescriptor.extractHashCode(AbstractTypeDescriptor.java:88) at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:201) at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:205) at org.hibernate.cache.spi.NaturalIdCacheKey.<init>(NaturalIdCacheKey.java:79) at org.hibernate.engine.internal.StatefulPersistenceContext$1.managedSharedCacheEntries(StatefulPersistenceContext.java:1801) at org.hibernate.engine.internal.StatefulPersistenceContext$1.manageSharedNaturalIdCrossReference(StatefulPersistenceContext.java:1792) at org.hibernate.action.internal.AbstractEntityInsertAction.handleNaturalIdPostSaveNotifications(AbstractEntityInsertAction.java:198) at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:130) at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:354) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:275) at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1181) at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:379) at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101) at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175) at org.hibernate.test.naturalid.mutable.cached.CachedMutableNaturalIdTest.testNaturalIdPersistNullValue(CachedMutableNaturalIdTest.java:127) ... N.B.: The exception does not happen without the @NaturalIdCache annotation Proposed solution: see pull request