I am having an issue with an optimizer stack trace on my linux QA box that I can't seem to reproduce on my windows development box. The stack trace is: 13:01:50,188 ERROR [stderr] (Thread-123) Exception in thread "Thread-123" java.lang.RuntimeException: unable to invoke method: com.billing.domain.context.OrderSideContext.getPrimarySide: target of method is null 13:01:50,188 ERROR [stderr] (Thread-123) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:66) 13:01:50,189 ERROR [stderr] (Thread-123) at org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.getValue(VariableAccessor.java:37) 13:01:50,189 ERROR [stderr] (Thread-123) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108) 13:01:50,189 ERROR [stderr] (Thread-123) at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:107) 13:01:50,189 ERROR [stderr] (Thread-123) at org.mvel2.ast.And.getReducedValueAccelerated(And.java:34) 13:01:50,189 ERROR [stderr] (Thread-123) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) 13:01:50,190 ERROR [stderr] (Thread-123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:123) 13:01:50,190 ERROR [stderr] (Thread-123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:116) 13:01:50,190 ERROR [stderr] (Thread-123) at org.mvel2.MVEL.executeExpression(MVEL.java:930) 13:01:50,190 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:70) 13:01:50,190 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConditionEvaluator.ensureBranchEvaluation(MvelConditionEvaluator.java:113) 13:01:50,191 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:106) 13:01:50,191 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:90) 13:01:50,191 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:82) 13:01:50,191 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:214) 13:01:50,191 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConstraint.access$000(MvelConstraint.java:41) 13:01:50,192 ERROR [stderr] (Thread-123) at org.drools.rule.constraint.MvelConstraint$1.run(MvelConstraint.java:201) 13:01:50,192 ERROR [stderr] (Thread-123) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 13:01:50,192 ERROR [stderr] (Thread-123) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 13:01:50,192 ERROR [stderr] (Thread-123) at java.lang.Thread.run(Thread.java:662) 13:01:50,192 ERROR [stderr] (Thread-123) Caused by: java.lang.NullPointerException 13:01:50,193 ERROR [stderr] (Thread-123) at sun.reflect.GeneratedMethodAccessor121.invoke(Unknown Source) 13:01:50,193 ERROR [stderr] (Thread-123) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 13:01:50,193 ERROR [stderr] (Thread-123) at java.lang.reflect.Method.invoke(Method.java:597) 13:01:50,193 ERROR [stderr] (Thread-123) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:40) 13:01:50,193 ERROR [stderr] (Thread-123) ... 19 more We are using a CENTOS with Java 1.6._31 and drools 5.4. Thanks -- View this message in context: http://drools.46999.n3.nabble.com/MVEL-optimizer-error-tp4018714.html Sent from the Drools: User forum mailing list archive at Nabble.com.