NullPointerException after persisting null NaturalId-values in combination with @NaturalIdCache ----------------------------------------------------------------------------------------------- Key: HHH-7177 URL: https://hibernate.onjira.com/browse/HHH-7177 Project: Hibernate ORM Issue Type: Bug Components: caching (L2) Affects Versions: 4.1.1 Reporter: Guenther Demetz Priority: Minor Labels: 2L-Cache, naturalId Attachments: TestCaseHHH-7177.jar Original Estimate: 1h Remaining Estimate: 1h Since Steve has fixed HHH-7158 (see org.hibernate.test.naturalid.nullable.NullableNaturalIdTest), there's no NullPointerException anymore when persisting null values. But a NullPointerException raises again when annotating the entity class with @NaturalIdCache. Cause: {code:title=NaturalIdCacheKey.java constructor|borderStyle=solid} result = prime * result + type.getHashCode( value, factory ); // raises NPE when value is null {code} Proposed fix: {code:title=NaturalIdCacheKey.java constructor|borderStyle=solid} result = prime * result + (value == null ? 0 : type.getHashCode( value, factory )); {code} Testcase (see attachement): {code:title=org.hibernate.test.annotations.naturalid.NaturalIdOnSingleManyToOneTest.java|borderStyle=solid} @Test public void testManyToOnePersistMutableNaturalIdWithNullValue() { NaturalIdOnManyToOne singleManyToOne = new NaturalIdOnManyToOne(); Citizen c1 = new Citizen(); c1.setFirstname( "Emmanuel" ); c1.setLastname( "Bernard" ); c1.setSsn( "1234" ); State france = new State(); france.setName( "Ile de France" ); c1.setState( null ); singleManyToOne.setCitizen( c1 ); Session s = openSession(); Transaction tx = s.beginTransaction(); s.persist( france ); s.persist( c1 ); s.persist( singleManyToOne ); c1.setState( france ); s.flush(); // --> java.lang.NullPointerException below raises, test passes when removing @NaturalIdCache annotation on Citizen entity {code}