I am using drools 3.1 MI I have got a class Message which contains an inner class ProcessRuleDTO When I try to assert the inner class object directly into memory it gives a shadow fact error. The Code Snippet : ProcessRuleDTO processRuleDTO=message.new ProcessRuleDTO(); workingMemory.assertObject( processRuleDTO ); Error : org.drools.RuntimeDroolsException: Error creating shadow fact for object: com..components.Message$ProcessRuleDTO@75e4fc at org.drools.base.ClassObjectType.getShadow(ClassObjectType.java:125) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:148) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:724) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:543) at Example.HelloWorldExample.main(HelloWorldExample.java:57) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:494) at org.drools.base.ClassObjectType.getShadow(ClassObjectType.java:123) ... 7 more Caused by: java.lang.NoSuchMethodError: com.components.Message$ProcessRuleDTO: method <init>()V not found at com.components.Message$ProcessRuleDTOShadowProxy.<init>(Unknown Source) ... 12 more Can we or not assert an inner class directly in drools? Thanks -- View this message in context: http://www.nabble.com/Error-creating-shadow-fact-for-object-tf3400224.htm... Sent from the drools - user mailing list archive at Nabble.com.