Try this.. $p : person( ) Message( name == "tree" ) from $p.add -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Veera Sent: Thursday, January 19, 2012 11:57 AM To: rules-users(a)lists.jboss.org Subject: [rules-users] java.lang.ClassCastException: java.lang.String cannot be cast to com.sample.DroolsTest$Message Hi All, Can anybody tell me what is the problem here .. i have a 2 classes: person(i have a field in this :java.lang.String add) Message(i have a filed in this :java.lang.String name) rule "H" when person( $a : add ) Message ( name == "tree" ) from $a then # System.out.println("in H rule"); when i compile this rule i am getting below exception... java.lang.ClassCastException: java.lang.String cannot be cast to com.sample.DroolsTest$Message Thanks in Advance.... Veeras -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-ClassCastException-java-lang-... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS***