[rules-users] RuleBase deserialization throws NPE

[dhai]

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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