Hi all, Using 4.0.7. I am getting this null pointer when doing an Insert into working memory. I know the object I am inserting is not null. java.lang.NullPointerException at org.drools.util.PrimitiveLongStack$Page.remove(PrimitiveLongStack.java:137) at org.drools.util.PrimitiveLongStack.pop(PrimitiveLongStack.java:69) at org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:44) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:785) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684) Any idea what might be causing this? Scott

Have not tried this with 5. Don't know if this makes a difference or not but I just added the following to our working memory config: rbconf.setShadowProxyExcludes("com.m2syscorp.i24card.rulesengine.facts.CountryGroup com.m2syscorp.i24card.rulesengine.facts.MerchantCategoryGroup"); Neither of those class facts are modified. We insert them, match on them, retract them. Scott On Thu, Oct 15, 2009 at 12:27 PM, Scott Burrows <scottjburrows(a)gmail.com&gt;wrote: > > Hi all, > > Using 4.0.7. > > I am getting this null pointer when doing an Insert into working memory. > > > I know the object I am inserting is not null. > > > java.lang.NullPointerException > at > org.drools.util.PrimitiveLongStack$Page.remove(PrimitiveLongStack.java:137) > at org.drools.util.PrimitiveLongStack.pop(PrimitiveLongStack.java:69) > at > org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:44) > at > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:785) > at > org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684) > > > Any idea what might be causing this? > > > Scott > > >