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  1. Drools
  2. DROOLS-1243

ClassCastException at runtime when trying to match "from" and a built-in accumulate function.

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Minor Minor
    • 7.0.0.Beta2
    • None
    • core engine
    • None
    • NEW
    • NEW

      A rule like this

      global java.util.List list;
rule R when
  $theFrom : Double() from accumulate(MyPerson( $val : age ); 
                                          sum( $val ) )
then
  list.add($theFrom);
end

      works fine but if modified like:

      import java.math.BigDecimal;
global java.util.List list;
rule R when
  $theFrom : BigDecimal() from accumulate(MyPerson( $val : age ); 
                                          sum( $val ) )
then
  list.add($theFrom);
end

      then it breaks at runtime, with ClassCastException.

      Suggested correct behavior:

      it should either raise a compilation error (if it is a typed function, like sum()) or just fail to match at runtime, as BigDecimal() does not match the result of sum()

      full stack trace for reference:

      Exception executing consequence for rule "R" in defaultpkg: java.lang.ClassCastException: java.lang.Double cannot be cast to java.math.BigDecimal
	at org.drools.core.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
	at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1110)
	at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:121)
	at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74)
	at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1017)
	at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1360)
	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1298)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1353)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1344)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1325)
	at org.drools.compiler.integrationtests.AccumulateTest.testCCEAtRuntimeFromAccumulate(AccumulateTest.java:3116)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.ClassCastException: java.lang.Double cannot be cast to java.math.BigDecimal
	at defaultpkg.Rule_R880096074DefaultConsequenceInvokerGenerated.evaluate(Unknown Source)
	at defaultpkg.Rule_R880096074DefaultConsequenceInvoker.evaluate(Unknown Source)
	at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1099)
	... 32 more

      Will submit test case for reproducing the error.

            mfusco@redhat.com Mario Fusco
            mmortari@redhat.com Matteo Mortari
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              Created:
              Updated:
              Resolved: