[rules-users] Using global variable in DRL file

[zeeshan]

Hi Laune !

I am using 5.4 version. When I tried ur second solution, it gives
*NullPointerException*. 

Below is Stack trace and also please find my Rule file.....




*WARNING: Unhandled Exception thrown: class java.lang.NullPointerException
Jul 30, 2012 2:01:18 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet action threw exception
java.lang.NullPointerException
	at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:451)
	at org.drools.reteoo.ReteooRuleBase.addPackage(ReteooRuleBase.java:435)
	at com.drools.facts.RuleRunner.loadRules(RuleRunner.java:71)
	at com.drools.facts.RuleRunner.getStatefulSession(RuleRunner.java:227)
	at com.drools.facts.RuleMain.main(RuleMain.java:43)
	at com.drools.action.PolicyAction.execute(PolicyAction.java:25)
	at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
	at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
	at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)
*



laune wrote
> 
> Could you please post the exact code of your rule with solution #2 and
> the NPE stack trace? You're using Drools 5.4.0?
> 
> This works with 5.4.0 - notice the "no-loop true". $sum has class
> Number, this needs intValue() (or whatever) to match the parameter
> type of the setter.
> 
> rule "accumulate Policy values into Agent"
> no-loop true
> when
>     $a: Agent( $id: id )
>     accumulate( Policy( agentId == $id, $v: value ); $sum: sum( $v ) )
> then
>     modify( $a ){ setValue( $sum.intValue() ) }
>     System.out.println( $a.toString() );
> end
> 
> 
> 
> On 30/07/2012, zeeshan <zeeshan.spring@> wrote:
>> HI Laune,
>>
>> Thanks for ur solutions, first one working fine but* we want agentAPE
>> value
>> for other rules or atleast we want them on RuleMain.java*(where we create
>> agent csv bean objects).
>>
>> Your second solution when we implemented was throwing NULL Pointer
>> Exception.
>>
>> Laune can u suggest us way in which we can solve problem related to first
>> solution
>> and if possible can we move with second one.
>>
>>
>> Thanks....
>>
>>
>>
>>
>>
>> --
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>>
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> 



http://drools.46999.n3.nabble.com/file/n4018960/Sample.drl Sample.drl 



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Sent from the Drools: User forum mailing list archive at Nabble.com.