hi, Im working on drools project in that i was dynamically loading a class and inserting the fact in to knowledge session.when i run the project with in eclipse IDE it works fine.but when i hosted it in the tomcat it was throwing runtime exception. Here is my sample application --------------------------------------------------------------------- main java class http://old.nabble.com/file/p26208580/ruleTest.txt ruleTest.txt sample rule http://old.nabble.com/file/p26208580/Sample.drl Sample.drl tomcat console http://old.nabble.com/file/p26208580/console1.PNG console1.PNG Added following jars in tomcat/lib ( actual path : C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\JStudio\WEB-INF\lib) antlr-runtime-3.1.1.jar core-3.4.2.v_883_R34x.jar drools-api-5.0.1.jar drools-compiler-5.0.1.jar drools-core-5.0.1.jar drools-jsr94-5.0.1.jar drools-decisiontables-5.0.1.jar mvel2-2.0.14.jar xstream-1.3.1.jar suggest me any ideas regards sathyasri -- View this message in context: http://old.nabble.com/drools-runtime-exception-tp26208580p26208580.html Sent from the drools - user mailing list archive at Nabble.com.