[rules-users] Drools 5.5 divide by 0 exception

[Stephen Masters]

Divide by zero exceptions usually occur when you try to divide by zero.

So … first question … is consolidatdVolume.avgVolume ever zero?


On 1 Nov 2013, at 16:17, gboro54 <gboro54 at gmail.com> wrote:

> I have rules like the following:
> 
> rule "Add Baseline to Context if it does not exists exists or not greater
> then 0"
> 	no-loop true
> 	when
> 		$context:Context($id:id,baselineParticipation==null || 
> 				  
> baselineParticipation.baselineRatio==null||baselineParticipation.baselineRatio==0)
> 	then
> 		modify($firm) {setBaselineParticipation(new BaselineParticipation($id,new
> BigDecimal(0.00485)))};
> 		
> end
> 
> rule "Calculate Participation Ratio"
> 	no-loop true
> 	when
> 		$context:Context(consolidatdVolume!=null,consolidatdVolume.avgVolume>0,
> 				   volumeAccumulations["total"]!=null,volumeAccumulations["total"]>0,
> 				   $ratio:(volumeAccumulations["total"]/consolidatdVolume.avgVolume))
> 	then
> 		ConcurrentMap calculatedRatios=$firm.getCalculatedRatios();
> 		calculatedRatios.put("fparticipationRatio",new BigDecimal($ratio));
> 		modify($firm){setCalculatedRatios(calculatedRatios)};
> end
> 
> Despite the checks I get the following exception and any insight into why
> would be great:
> 
> Exception executing consequence for rule "Calculate Firm Participation
> Ratio" in com.nasdaq.rms.nq.status: java.lang.ArithmeticException: / by zero
> Exception executing consequence for rule "Calculate Firm Participation
> Ratio" in com.nasdaq.rms.nq.status: java.lang.ArithmeticException: / by zero
> 	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:674)
> 	at
> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
> 	at
> com.nasdaq.fq.rms.workflow.processor.rules.PerformanceStatusAssignmentProcessor.doWork(PerformanceStatusAssignmentProcessor.java:156)
> 	at com.ften.ssr.workqueue.WorkItemRunnable.run(WorkItemRunnable.java:48)
> 	at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:724)
> Caused by: java.lang.ArithmeticException: / by zero
> 	at ConditionEvaluatorda6271cf5a744b6bbdb9c717cae2edb7.evaluate(Unknown
> Source)
> 	at
> org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:200)
> 	at
> org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)
> 	at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:154)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
> 	at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
> 	at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:314)
> 	at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:265)
> 	at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:483)
> 	at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:383)
> 	at
> org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:337)
> 	at
> com.nasdaq.rms.nq.status.Rule_Calculate_Firm_Participation_Ratio_cfb033f33c2b404fb2bff8e1b9af0175.defaultConsequence(Unknown
> Source)
> 	at
> com.nasdaq.rms.nq.status.Rule_Calculate_Firm_Participation_Ratio_cfb033f33c2b404fb2bff8e1b9af0175DefaultConsequenceInvokerGenerated.evaluate(Unknown
> Source)
> 	at
> com.nasdaq.rms.nq.status.Rule_Calculate_Firm_Participation_Ratio_cfb033f33c2b404fb2bff8e1b9af0175DefaultConsequenceInvoker.evaluate(Unknown
> Source)
> 	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
> 	... 10 more
> 
> 
> 
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