Hi all! I need to apply rules to each element of a collection. So I tried to use ForEach component in my ruleflow. Here is my rule flow file http://n3.nabble.com/forum/FileDownload.jtp?type=n&id=744264&name... testRuleflow.rf . I set CollectionExpression to "children" and VariableName to "child" properties of the component. In the code to run rules: .... Map variables = new HashMap(); variables.put("children", collection); ksession.startProcess(ruleFlowName, variables); ksession.fireAllRules(); .... But when I run the code it throws the following exception: 437 [main] INFO com.test.TestForEach - Start process: flow Exception in thread "main" java.lang.IllegalArgumentException: Could not find collection children at org.drools.workflow.instance.node.ForEachNodeInstance$ForEachSplitNodeInstance.evaluateCollectionExpression(ForEachNodeInstance.java:112) at org.drools.workflow.instance.node.ForEachNodeInstance$ForEachSplitNodeInstance.internalTrigger(ForEachNodeInstance.java:81) at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112) at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:148) at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:135) .... Any guesses what I am doing wrong? -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/How-to-Ruleflow-ForEa... Sent from the Drools - Dev mailing list archive at Nabble.com.