NPE in HashKey.equals when LHS checks for null object, the object is null, and there are more than 3 rules ---------------------------------------------------------------------------------------------------------- Key: JBRULES-1032 URL: http://jira.jboss.com/jira/browse/JBRULES-1032 Project: JBoss Rules Issue Type: Bug Security Level: Public (Everyone can see) Affects Versions: 4.0.0.GA Environment: Testing 4.0.0 on Windows XP, the released version. Reporter: Andrew Harris Assigned To: Mark Proctor Attachments: Hash Error Case.zip I have a rule that checks for an object field being null as below when m : Message( statusMessage == null ) When the field is null, and there are three or more rules in the rule file, then I get a NPE at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.equals(CompositeObjectSinkAdapter.java:608) This line is return (this.index == other.index) && (this.ovalue.equals( otherValue )); and ovalue.equals is null, causing the NullPointerException. This only happens if there are 3 or more rules, because the default configuration says that the HASH_THRESHOLD_SYSTEM_PROPERTY is 3. The full stack trace is below, and I have attached a simple test case. Note that the test case was originally tested in 3.0.6 and works fine there. java.lang.NullPointerException at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.equals(CompositeObjectSinkAdapter.java:608) at org.drools.util.AbstractHashTable$EqualityEquals.equal(AbstractHashTable.java:345) at org.drools.util.ObjectHashMap.get(ObjectHashMap.java:86) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:295) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168) at org.drools.reteoo.Rete.assertObject(Rete.java:168) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:848) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:822) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:623) at com.sample.DroolsTest.runTest(Unknown Source) at com.sample.DroolsTest.testRules(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at junit.framework.TestCase.runTest(TestCase.java:154) at junit.framework.TestCase.runBare(TestCase.java:127) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at junit.framework.TestSuite.runTest(TestSuite.java:208) at junit.framework.TestSuite.run(TestSuite.java:203) at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:421) at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:912) at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:766) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira