[rules-users] ClassCastException after migrating from Drools 4.x to v5.5

Wolfgang Laun wolfgang.laun at gmail.com
Mon Feb 18 08:03:51 EST 2013 

Here is another quote from "Expert" (4.8.3.3.2., Property access on
Java Beans), which raises some doubt.

<quote>
In a stateful session, care should be taken when using nested
accessors as the Working Memory is not aware of any of the nested
values, and does not know when they change.
</quote>

So, I don't have to take care in a stateless session? But if this is
merely a wrapper for a stateful session, one should think that there's
no difference?

-W


On 18/02/2013, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
> I'll insert a sentence stating that all the RHS operations
> insert/modify/delete are still possible. The strong negative in the
> quoted sentence needs to be balanced.
> -W
>
> On 18/02/2013, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
>> Mark,
>>
>> On 18/02/2013, Mark Proctor <mproctor at codehaus.org> wrote:
>>> stateless is just a wrapped stateful session - insert, update and delete
>>> work as normal.
>>
>> So let's get this straight, this quote from the "Expert" manual which
>> does NOT refer to sequential mode!!) is wrong and should be removed:
>> <quote>
>> Stateless sessions do not support iterative insertions and the method
>> call fireAllRules() from Java code;
>> </quote>
>>
>>>
>>> For "sequential" mode, inserts will reach the right input of a beta node
>>> and
>>> then just do nothing - as all the beta network evaluation has been done.
>>
>> Which I take it to mean that you can do insert (and retract? and
>> modify?) but it will not work as intended? Without error indication??
>>
>> -W
>>
>>>
>>> Mark
>>> On 18 Feb 2013, at 07:17, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
>>>
>>>> I may be mistaken, but the stack trace looks as if a stateless
>>>> knowledge session is being run, wherein it executes a RHS
>>>> ("employeePreloadSystemConstants") where some fact is being inserted.
>>>>
>>>> Not sure what *ought* to happen in this case, though: I've been trying
>>>> to find this out ever since 5.1.x. A meagre "...do not support
>>>> iterative insertions..." is all there is to be read, but what does
>>>> this imply? Simply doesn't work in an unspecified way? May crash on
>>>> workdays...?? A "tut, tut" from the Drools Team ??? ;-)
>>>>
>>>> -W
>>>>
>>>>
>>>> On 18/02/2013, Mark Proctor <mproctor at codehaus.org> wrote:
>>>>> Looks like an 'or' bug. Which is surprising, as we had 'or' bugs in
>>>>> 4.x,
>>>>> and
>>>>> fixed a lot of them for 5.x.
>>>>>
>>>>> Could you build and try 5.5.x here now, this is the branch for the 5.6
>>>>> release:
>>>>> https://github.com/droolsjbpm/drools/tree/5.5.x
>>>>>
>>>>> If it's still not fixed, could you write an isolated test? Seems like
>>>>> you
>>>>> only need one rule, and two or three facts to trigger it. Ideally
>>>>> please
>>>>> re-use facts from the test classes already existing - details of how
>>>>> to
>>>>> write tests, and submit as pull requests is here:
>>>>> http://docs.jboss.org/drools/release/5.4.0.Final/droolsjbpm-introduction-docs/html/gettingstarted.html
>>>>>
>>>>> If you can get us this test pull request asap (next few days), we'll
>>>>> fix
>>>>> and
>>>>> get it into the 5.6 release. Otherwise you may have to wait some time
>>>>> for
>>>>> a
>>>>> fix.
>>>>>
>>>>> Mark
>>>>> On 18 Feb 2013, at 01:10, ismaximum <mnrz57 at gmail.com> wrote:
>>>>>
>>>>>> Ah sorry.. It seems my first message hasn't been accepted by the
>>>>>> user-list...
>>>>>> I post it again here:
>>>>>>
>>>>>> After we upgrade to Drools v 5.5 there are hundreds of errors in test
>>>>>> cases
>>>>>> related to our rules.
>>>>>> One of which is related to this ClassCastException which I noticed it
>>>>>> occurs
>>>>>> when we have nested OR statements
>>>>>>
>>>>>> Here is one example:
>>>>>>
>>>>>> rule "employeeContributionStartDateAfterAccountStartDate"
>>>>>>   ruleflow-group "EmployeeValidation"
>>>>>>   when
>>>>>>               // We only want this rule to fire when we are using the
>>>>>> create:Employee node.  NOTE that the startDate or
>>>>>> contributionStartDate
>>>>>> cannot be updated
>>>>>>               EmployeeDetailsRulesModel(create == true)
>>>>>>               // Get the date to validate
>>>>>>       Employee( $contributionStartDate : contributionStartDate !=
>>>>>> null
>>>>>> )
>>>>>>       (or
>>>>>>           (and
>>>>>>               // i.e. The contribution start date and the account
>>>>>> start
>>>>>> dates are both specified.
>>>>>>               Account( $accountStartDate : accountStartDate != null )
>>>>>>               eval( $contributionStartDate.compare($accountStartDate)
>>>>>> <
>>>>>> 0
>>>>>> )
>>>>>>           )
>>>>>>           (and
>>>>>>               // The contribution start date is specified but the
>>>>>> account
>>>>>> start date is not, but should be defaulted to today.
>>>>>>               Account( accountId == null, accountStartDate == null )
>>>>>>               SystemConstants($today : currentSystemDateWithoutTime)
>>>>>>               eval(
>>>>>> $contributionStartDate.compare(jaxbUtils.toXMLGregorianCalendarDateOnly($today))
>>>>>> < 0 )
>>>>>>           )
>>>>>>           (and
>>>>>>               // for an existing account where the account start date
>>>>>> is
>>>>>> not specified.
>>>>>>               Account( $accountId : accountId != null,
>>>>>> $accountStartDate
>>>>>> :
>>>>>> accountStartDate == null )
>>>>>>               $composerMemberAccount : BaseMemberAccount() from
>>>>>> memberAccountDAO.getMemberAccount($accountId)
>>>>>>               eval(
>>>>>> $contributionStartDate.compare(jaxbUtils.toXMLGregorianCalendarDateOnly($composerMemberAccount.getFundStartDate()))
>>>>>> < 0 )
>>>>>>           )
>>>>>>       )
>>>>>>   then
>>>>>>       error(ApplicationArea.EMPLOYEE, kcontext);
>>>>>> end
>>>>>>
>>>>>>
>>>>>>
>>>>>> Here is the error message:
>>>>>>
>>>>>> Exception executing consequence for rule
>>>>>> "employeePreloadSystemConstants"
>>>>>> in
>>>>>> com.cname.rules.validation.business:
>>>>>> org.drools.RuntimeDroolsException:
>>>>>> com.cname.rules.validation.business.Rule_employeeContributionStartDateAfterAccountStartDate_357b04c70dac4f469ea9cedd93d15da7Eval1Invoker at d3924bbc
>>>>>> : java.lang.ClassCastException:
>>>>>> com.cname.rules.model.common.EmployeeDetailsRulesModel cannot be cast
>>>>>> to
>>>>>> com.cname.cbis.domain.update.Account
>>>>>>       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
>>>>>> org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:106)
>>>>>>       at
>>>>>> org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:32)
>>>>>>       at
>>>>>> org.drools.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:155)
>>>>>>       at
>>>>>> org.drools.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:76)
>>>>>>       at
>>>>>> org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:264)
>>>>>>       at
>>>>>> com.cname.rules.CBISAbstractRuleCoverageTest.runValidation(CBISAbstractRuleCoverageTest.java:441)
>>>>>>       at
>>>>>> com.cname.rules.business.EmployeeBusinessRulesTest.testEmployeeContributionStartDateAfterAccountStartDate(EmployeeBusinessRulesTest.java:348)
>>>>>>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>>>       at
>>>>>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>>>>       at
>>>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>>>>       at java.lang.reflect.Method.invoke(Method.java:597)
>>>>>>       at junit.framework.TestCase.runTest(TestCase.java:168)
>>>>>>       at junit.framework.TestCase.runBare(TestCase.java:134)
>>>>>>       at junit.framework.TestResult$1.protect(TestResult.java:110)
>>>>>>       at junit.framework.TestResult.runProtected(TestResult.java:128)
>>>>>>       at junit.framework.TestResult.run(TestResult.java:113)
>>>>>>       at junit.framework.TestCase.run(TestCase.java:124)
>>>>>>       at junit.framework.TestSuite.runTest(TestSuite.java:243)
>>>>>>       at junit.framework.TestSuite.run(TestSuite.java:238)
>>>>>>       at
>>>>>> org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
>>>>>>       at
>>>>>> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
>>>>>>       at
>>>>>> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>>>>>>       at
>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
>>>>>>       at
>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
>>>>>>       at
>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
>>>>>>       at
>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
>>>>>> Caused by: org.drools.RuntimeDroolsException:
>>>>>> com.cname.rules.validation.business.Rule_employeeContributionStartDateAfterAccountStartDate_357b04c70dac4f469ea9cedd93d15da7Eval1Invoker at d3924bbc
>>>>>> : java.lang.ClassCastException:
>>>>>> com.cname.rules.model.common.EmployeeDetailsRulesModel cannot be cast
>>>>>> to
>>>>>> com.cname.cbis.domain.update.Account
>>>>>>       at
>>>>>> org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:119)
>>>>>>       at
>>>>>> org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:176)
>>>>>>       at
>>>>>> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
>>>>>>       at
>>>>>> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
>>>>>>       at
>>>>>> org.drools.reteoo.JoinNode.propagateFromRight(JoinNode.java:159)
>>>>>>       at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:148)
>>>>>>       at
>>>>>> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
>>>>>>       at
>>>>>> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
>>>>>>       at
>>>>>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
>>>>>>       at
>>>>>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
>>>>>>       at
>>>>>> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
>>>>>>       at
>>>>>> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
>>>>>>       at
>>>>>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
>>>>>>       at
>>>>>> org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:192)
>>>>>>       at
>>>>>> org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:186)
>>>>>>       at
>>>>>> com.cname.rules.validation.business.Rule_employeePreloadSystemConstants_dcf7facf199041d3aa8f3b85387b4318.defaultConsequence(Rule_employeePreloadSystemConstants_dcf7facf199041d3aa8f3b85387b4318.java:7)
>>>>>>       at
>>>>>> com.cname.rules.validation.business.Rule_employeePreloadSystemConstants_dcf7facf199041d3aa8f3b85387b4318DefaultConsequenceInvokerGenerated.evaluate(Unknown
>>>>>> Source)
>>>>>>       at
>>>>>> com.cname.rules.validation.business.Rule_employeePreloadSystemConstants_dcf7facf199041d3aa8f3b85387b4318DefaultConsequenceInvoker.evaluate(Unknown
>>>>>> Source)
>>>>>>       at
>>>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
>>>>>>       ... 31 more
>>>>>> Caused by: java.lang.ClassCastException:
>>>>>> com.cname.rules.model.common.EmployeeDetailsRulesModel cannot be cast
>>>>>> to
>>>>>> com.cname.cbis.domain.update.Account
>>>>>>       at
>>>>>> org.drools.base.com.cname.cbis.domain.update.Account1384796854$getAccountStartDate.getValue(Unknown
>>>>>> Source)
>>>>>>       at
>>>>>> org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:87)
>>>>>>       at org.drools.rule.Declaration.getValue(Declaration.java:233)
>>>>>>       at
>>>>>> com.cname.rules.validation.business.Rule_employeeContributionStartDateAfterAccountStartDate_357b04c70dac4f469ea9cedd93d15da7Eval1InvokerGenerated.evaluate(Unknown
>>>>>> Source)
>>>>>>       at
>>>>>> com.cname.rules.validation.business.Rule_employeeContributionStartDateAfterAccountStartDate_357b04c70dac4f469ea9cedd93d15da7Eval1Invoker.evaluate(Unknown
>>>>>> Source)
>>>>>>       at
>>>>>> org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
>>>>>>       ... 49 more
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> View this message in context:
>>>>>> http://drools.46999.n3.nabble.com/ClassCastException-after-migrating-from-Drools-4-x-to-v5-5-tp4022292p4022382.html
>>>>>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>>>>>> _______________________________________________
>>>>>> rules-users mailing list
>>>>>> rules-users at lists.jboss.org
>>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>
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>

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