[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1315) Rule that uses a 'collect' and 'from' clause together causes problem

Rule that uses a 'collect' and 'from' clause together causes problem -------------------------------------------------------------------- Key: JBRULES-1315 URL: http://jira.jboss.com/jira/browse/JBRULES-1315 Project: JBoss Drools Issue Type: Bug Security Level: Public(Everyone can see) Components: Reteoo Affects Versions: 4.0.3 Reporter: Igor Bolic Test case: Write a Rule that uses a 'collect' and 'from' clause together, example: package com.sample.mypackage rule "Apply discount" when $order: Order(); $items : ArrayList() from collect (OrderItem() from $order.items) then #apply discount end first i add the package to RuleBase object, everthing works fine. When i try to 'refresh' my rules, i.e. first remove the package and again add the same (modified) package to the RuleBase object, following error occurs: java.lang.IllegalArgumentException: Cannot remove a sink, when the list of sinks is null at org.drools.reteoo.ObjectSource.removeObjectSink(ObjectSource.java:116) at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:181) at org.drools.reteoo.LeftInputAdapterNode.remove(LeftInputAdapterNode.java:204) at org.drools.reteoo.FromNode.remove(FromNode.java:153) at org.drools.reteoo.RightInputAdapterNode.remove(RightInputAdapterNode.java:167) at org.drools.reteoo.BetaNode.remove(BetaNode.java:186) at org.drools.reteoo.RuleTerminalNode.remove(RuleTerminalNode.java:461) at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:224) at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:272) at org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:460) ... I've found a workaround for this error by writing my .drl code as following: package com.sample.mypackage rule "Explode Cart" salience 11 dialect "java" when $order: Order() $item : OrderItem() from $order.items then insert( $item ); end rule "Apply discount" no-loop true when $order : Order(); $items : ArrayList() from collect (OrderItem()) then #apply discount end Now, my rules are 'refreshed' without any error.