We are migrating couple hundred rules from Drools 3 to 5. We have rules like below. rule "Test rule" salience 100000 when core : BWCore(systemId == "1" ) || BWCore(systemId == "2" ) || BWCore(systemId == "3") then System.out.println( "bwid: " + core.getBWIntId()); end This rule works fine in 3, but in 4 and 5 it throws below exception when we insert a BWCore object with systemId 2. The same works fine if the object inserted has systemId as 1. 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) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:627) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:183) at com.sample.BWTest.main(BWTest.java:32) Caused by: java.lang.NullPointerException at org.drools.reteoo.LeftTuple.get(LeftTuple.java:300) at com.sample.Rule_Make_BossBWs_FABWs_and_TMCBWs_retail_bws_0ConsequenceInvoker.evaluate(Rule_Make_BossBWs_FABWs_and_TMCBWs_retail_bws_0ConsequenceInvoker.java:15) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934) ... 6 more Is this kind of || syntax no longer supported in 4 and 5? Thanks -- View this message in context: http://n3.nabble.com/Drools-upgrade-from-3-to-5-OR-syntax-tp471205p471205... Sent from the Drools - User mailing list archive at Nabble.com.