Re: [rules-users] Drools 5.5 divide by 0 exception

I can anticipate the answer where OP says that there is a constraint restricting argVolume to > 0. However, I don't think that independent constraints such as we see them in this rule are evaluated as if they were in a single logical expression, with Java semantics. The seductive possibility of binding to a half-baked expression (i.e., $ratio:(volumeAccumulations["total"]/consolidatdVolume.avgVolume)) should be discarded. This value can safely be computed on the RHS where the denominator's value being !=0 is asserted. -W On 01/11/2013, Stephen Masters <

stephen.masters@

> wrote: > 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@

> 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 >> >> >> >> -- >> View this message in context: >> http://drools.46999.n3.nabble.com/Drools-5-5-divide-by-0-exception-tp4026... >> Sent from the Drools: User forum mailing list archive at Nabble.com. >> _______________________________________________ >> rules-users mailing list >>

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