I'm getting the following stack when trying to serialize a session containing one running process: java.io.NotSerializableException: org.drools.workflow.instance.impl.NodeInstanceFactoryRegistry at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at org.drools.RuleBaseConfiguration.writeExternal(RuleBaseConfiguration.java:191) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1421) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1390) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at org.drools.common.AbstractRuleBase.writeExternal(AbstractRuleBase.java:204) at org.drools.reteoo.ReteooRuleBase.writeExternal(ReteooRuleBase.java:185) at org.drools.impl.KnowledgeBaseImpl.writeExternal(KnowledgeBaseImpl.java:81) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1421) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1390) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) The call is thrown from this line of code: droolsOut.writeObject(session.getKnowledgeBase()); Is this a legitimate bug in Drools? Or is this because something in my knowledge base is not serializable? The "org.drools.workflow.instance.impl.NodeInstanceFactoryRegistry" is what is confusing me if this is my issue or a Drools issue. Thanks! -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Error-when-trying-to-... Sent from the Drools - User mailing list archive at Nabble.com.