[rules-users] InvalidClassException: When creating RuleAgent

[Felbecker, Tobias]

When I create a new RuleAgent with a package created with the BRMS
following Exception is thrown:

RuleAgent(BusinessRuleEngine) INFO (Wed Jul 23 12:00:32 CEST 2008):
Configuring with newInstance=true, secondsToRefresh=30
RuleAgent(BusinessRuleEngine) INFO (Wed Jul 23 12:00:32 CEST 2008):
Configuring package provider : FileScanner scanning:
D:\...\mypackage.pkg 
RuleAgent(BusinessRuleEngine) EXCEPTION (Wed Jul 23 12:00:33 CEST 2008):
org.drools.base.mvel.DroolsMVELFactory; Serializable incompatible with
Externalizable. Stack trace should follow.
java.io.InvalidClassException: org.drools.base.mvel.DroolsMVELFactory;
Serializable incompatible with Externalizable
...

It works fine with another package created earlier. So it could be
something wrong with my fact model.
I couldn't find any useful information about the Serializeable
incompatible with Externalizable on the web.

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