[rules-users] RuleBase deserialization throws NPE

[Bhamidi, Krishna]

Normally I get this when there is a version incompatibility between Guvnor and the clients. Are you using the same Drools jar versions on both sides?

-----Original Message-----
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of dhai
Sent: Monday, April 20, 2009 8:59 PM
To: rules-users at lists.jboss.org
Subject: [rules-users] RuleBase deserialization throws NPE


We have application that has two parts. One is for authoring the rules and deploying RuleBase into database. Second reads that sterilized RuleBase from database and evaluate the rules. I am randomly getting NPE while I desterilize RuleBase. Its very inconsistent. The test data and environment in same. Once I get one NPE while performing 2000 transactions and second time I receive same exception after 500 transactions. The first test was executed in single threaded and second was in multi threaded. 
 
I was wondering if some one else had encounter same problem. There trace is:
 
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NullPointerException 
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1820) 
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) 
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) 
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) 
        at
org.drools.common.AbstractRuleBase.doReadExternal(AbstractRuleBase.java:257) 
        at
org.drools.reteoo.ReteooRuleBase.readExternal(ReteooRuleBase.java:151) 
        at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755) 
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717) 
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) 
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) 
        at
net.dharis.net.rules.RulesResolverImpl.resolveFor(RulesResolverImpl.java:48)
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