sorry i missed something the null pointer is caused by the ruleBase variable which can b null when calling the constructor from WorkItemInfo class using getWorkItem(); thanks once again -- View this message in context: http://n3.nabble.com/MarshallerReaderContext-resolveClass-unhandled-null-... Sent from the Drools - User mailing list archive at Nabble.com.

hi daniel, actually the error was caused from the Class.forName where to code specified its own class loader as i line : return Class.forName(name, false, this.ruleBase.getRootClassLoader()); here actually the rulebase is null while initializing hence this is created the error as null pointer exception i resolved this by using the default classLoader which can be used directly by specifying the classLoader field in function call as null..... java Documentation wrote: so to get rid of the error i used : return Class.forName(name, false, null); and it is working fine. this is wht my solution was as i didn't get any reply from Drools Team regards kiranP -- View this message in context: http://n3.nabble.com/MarshallerReaderContext-resolveClass-unhandled-null-... Sent from the Drools - User mailing list archive at Nabble.com.