[rules-users] Problem

Hi All, I am using the 4.0.M2 version of jboss rules. public class Device() { private Boolean isCiscoVersion; private Boolean sysNamePresent; private Boolean isPixVersion; } When I write the rule as follows :- rule "Cisco PIX Device" when d : Device ( isCiscoVersion == null, sysNamePresent == true, isPixVersion == true ) then System.out.println("This is a cisco pix device."); end The rule works. However, when I write the same rule as rule "Cisco PIX Device" when d : Device ( isCiscoVersion == false, sysNamePresent == true, isPixVersion == true ) then System.out.println("This is a cisco pix device."); end It even fails to compile and add the rule into the package. Not sure what is going on ?. Following is the error I keep getting :- java.lang.NullPointerException at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.setValue( CompositeObjectSinkAdapter.java:501) at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.<init>( CompositeObjectSinkAdapter.java:441) at org.drools.reteoo.CompositeObjectSinkAdapter.hashSinks( CompositeObjectSinkAdapter.java:158) at org.drools.reteoo.CompositeObjectSinkAdapter.addObjectSink( CompositeObjectSinkAdapter.java:72) at org.drools.reteoo.ObjectSource.addObjectSink(ObjectSource.java:104) at org.drools.reteoo.ObjectTypeNode.addObjectSink(ObjectTypeNode.java :313) at org.drools.reteoo.AlphaNode.attach(AlphaNode.java:116) at org.drools.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:129) at org.drools.reteoo.builder.PatternBuilder.attachAlphaNodes( PatternBuilder.java:119) at org.drools.reteoo.builder.PatternBuilder.attachPattern( PatternBuilder.java:71) at org.drools.reteoo.builder.PatternBuilder.build(PatternBuilder.java :55) at org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build( GroupElementBuilder.java:111) at org.drools.reteoo.builder.GroupElementBuilder.build( GroupElementBuilder.java:69) at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule( ReteooRuleBuilder.java:143) at org.drools.reteoo.builder.ReteooRuleBuilder.addRule( ReteooRuleBuilder.java:108) at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:112) at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:266) at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java :293) at com.sample.CfiTest.readRule(CfiTest.java:71) at com.sample.CfiTest.main(CfiTest.java:23) Any ideas why this is happening ?. -Krishnan. -- Sivaramakrishna Iyer Krishnan (Anand) Never assume the obvious is true. - William Safire