[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.

[Prashant Hariharan (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777064#comment-12777064 ] 

Prashant Hariharan commented on DROOLS-147:
-------------------------------------------

Hi,thanks for the reply.
Couple of things i want to point out,
1) For the attached code which i had sent , i had already added the jBPM 5.4 dependency.
2) In the attached code i have commented the part wherein i am using knowledge builders ,knowledgepackages and stateless knowledge sessions.
The code works fine for te same scenario when i use the above mentioned classes.

The problem is with the usage of of PackageBuilders and that too in a peculiar way in which the rule flow is called.
Initially we are calling a rule and from the rule we are invoking the rule flow using the drools.getWorkingMemory().startProcess(<rule flow id>)
Kindly refer the drl and rf files attached.
In the above scenario the first rule is executed successfully but the execution of 2nd rule fails(ie the call to rule flow).But the exact case works fine with the knowledge builders.
Is it possible to provide a workaround / patch for the case to work with packagebuilders?

                
> 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
>         Attachments: rfissue.zip
>
>
> 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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