Hi All, When we try to serialize a RuleBase in a Remote EJB Call We are getting a java.lang.StackOverflowError. This problem only happens in HPUX, in local dev in windows works fine! I have no idea why or what is the problems... Any Ideas? Thanks in advance for any help. regards, Pedro Costa. java.lang.StackOverflowError at sun.reflect.GeneratedMethodAccessor225.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347) ... LOTS .... at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302) at org.drools.common.AbstractRuleBase.doWriteExternal(AbstractRuleBase.java:195) at org.drools.reteoo.ReteooRuleBase.writeExternal(ReteooRuleBase.java:138) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1310) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1288) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)