[rules-users] evaluation of null not consistent

Hi; I am trying to debug a situation in which a rule fires when it should not. The rule is: rule "DTR2_AOU_Mapping" when when instance_0_Contact : Contact($var_0_guid : guid != null ) instance_1_Track : Track($var_1_aou : aouAsFloat != null && $var_3_platform_ptr : platform != null ) eval($var_3_platform_ptr.getGuid() == $var_0_guid ) then : : The problem is the 2nd condition and the criteria "$var_1_aou : aouAsFloat != null ". When fired we get a Null Ptr Exception. When I examened the log file in the Audit view, I see that the rule has fired even tho it clearly states that $var_1_aou = null: <org.drools.audit.event.ActivationLogEvent> <type>4</type> <activationId>DTR2_AOU_Mapping [3, 1]</activationId> <rule>DTR2_AOU_Mapping</rule> <declarations> $var_3_platform_ptr=com.callc.das.kb.ASW.Contact@5b21ae2(3); instance_1_Track=com.callc.das.kb.ASW.Track@1e071f47(3); instance_0_Contact=com.callc.das.kb.ASW.Contact@5b21ae2(1); $var_1_aou=null; $var_0_guid=2139982358(1) </declarations> </org.drools.audit.event.ActivationLogEvent> What makes matters worse is that the EXACT SAME RULE when running in a different application will behave as expected. What I mean by this is that we have embedded the Drools rule engine in two different Java applications, both of which set-up and use the rule engine with the exact same constructs and sequence of commands (e.g., use of a StatefulKnowledgeSession). I then inserted the same information into both. One runs fine but the other generates the log file shown above and throws : org.drools.runtime.rule.ConsequenceException: java.lang.NullPointerException at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086) : : Any suggestions regarding what is going on here would be most appreciated as I am 100% stumped by this. Thanks Larry -- View this message in context: http://n3.nabble.com/evaluation-of-null-not-consistent-tp724910p724910.html Sent from the Drools - User mailing list archive at Nabble.com.