[jboss-jira] [JBoss JIRA] (DROOLS-147) After upgrading the drools jars to 5.5.0 from 5.0.1 we are unable to execute the rule flows.

Fri May 24 01:51:06 EDT 2013

Prashant Hariharan created DROOLS-147:
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             Summary: After upgrading the drools jars to 5.5.0 from 5.0.1 we are unable to execute the rule flows.
                 Key: DROOLS-147
                 URL: https://issues.jboss.org/browse/DROOLS-147
             Project: Drools
          Issue Type: Component  Upgrade
      Security Level: Public (Everyone can see)
    Affects Versions: 5.5.0.Final
         Environment: Websphere application server 6.1
            Reporter: Prashant Hariharan
            Assignee: Mark Proctor

After upgrading the drools jars to 5.5.0 from 5.0.1 we are unable to execute the rule flows. The drools engine throws a null pointer exception the stackrace of which is as follows : The stacktrace of the same can be seen below: Exception executing consequence for rule "Initialisation For All" in com.mastek.groupelixir.schemeuw.rules.controller: java.lang.NullPointerException at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:684) at org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:206) 

After some detailed analysis the problem seems to be with the usage of Rule base,PacakgeBuilder and StatlessSessions as opposed to the set of KnowledgeBaes,KowledgeBuilders and StatelessKnowledgeSessions for executing the rule flows. The rule flow,drl and the standalone program has been attached for reference. The problem is that the application still uses the packagebuilder and it will be difficult to upgrade it to knowledge builders So is there any workaround for the same?

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