Hi I've inherited some old code running under 4.x of Drools. I'm investigating use of 5.1.0 for newer development. I was testing the old code base as is with drools 5.1.0 and got some compilation issues on the DRL. Here is the sample drl snippet package com.test.rule import ... rule "EmailVerificationCheck" salience 500 when context : RuleContext (paymentMethod == "P_EXPRESS") eval (!context.isTrustedUser()) act : RuleAction (action == null || == "VERIFY") then if (act.getAction() == null) { if(!context.isPEmailVerified()) { act.setAction ("VERIFY"); } } if (act.getAction() == "VERIFY") { if(!context.isPEmailVerified()) { act.getRuleNames().add("PEmailVerificationCheck"); } } end Compilation error is at eval (!context.isTrustedUser()) and the error message is as follows - org.drools.rule.InvalidRulePackage: Unable to generate rule invoker. : org.drools.lang.descr.EvalDescr@1f8b158 com/playspan/rule/Rule_PayPal_EmailVerificationCheck_0Eval0Invoker.java (16:48) : Redefinition of local variable "context" at org.drools.rule.Package.checkValidity(Package.java:477) ~[drools-core-5.1.0.jar:5.1.0] at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:479) ~[drools-core-5.1.0.jar:5.1.0] at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:445) ~[drools-core-5.1.0.jar:5.1.0] at org.drools.reteoo.ReteooRuleBase.addPackage(ReteooRuleBase.java:452) ~[drools-core-5.1.0.jar:5.1.0] at com.playspan.rule.RuleEngine.buildRuleBase(RuleEngine.java:374) [classes/:na] at com.playspan.rule.RuleEngine.initializeRuleSession(RuleEngine.java:384) [classes/:na] It is using java dialect and JANINO compiler. I would really appreciate if some could point me to a direction for troubleshooting this issue. Is this construct invalid for 5.x onwards? Thanks Kumar