<br> This was a bug. It is fixed now. Thanks for reporting.<br><br><a href="https://jira.jboss.org/jira/browse/JBRULES-2202">https://jira.jboss.org/jira/browse/JBRULES-2202</a><br><br> Edson<br><br><div class="gmail_quote">
2009/7/9 bill simms <span dir="ltr"><<a href="mailto:sitrious@gmail.com">sitrious@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hello,<br><br>Recently I've been working with Drools version 5.0.1 to set up an event processor. While doing so I have come<br>across difficulties with the accumulate function, in that it will always throw a ClassCastException<br>
when inserting events that are declared within my drl file. To illustrate this I've set up an example which is <br>shown below. I've search Google and the mailing list for several hours, but the only way past this problem<br>
appears to be that I will have to declare a class externally and make sure it implements Serializable. Does<br>anyone has suggestions for another approach? Secondly, I would have assumed that since Drools was<br>compiling these internally declared classes, that Serializable would have been implemented automatically. So<br>
is this a result of the generated class not implementing Serializable, or have I missed something in my rules<br>file? Thanks.<br><br>The important part of my drl file is:<br><br>declare TestEvent<br> @role( event )<br>
@expires(10s)<br> id : String<br>end <br><br>#This rule works fine when 'Accumulate Count' is commented out, and is used to make<br>#sure that the event inserting has worked.<br>rule "Is It There"<br>
when<br> TestEvent() from entry-point "test"<br> then<br> System.out.println("Found a TestEvent.");<br>end<br><br>#This rule throws a ClassCastException when a TestEvent is inserted.<br>
rule "Accumulate Count"<br> when<br> $n : Number() from accumulate($t : TestEvent() from entry-point "test", count($t))<br> then<br> System.out.println("Found " + $n + " events.");<br>
end<br><br>The unit test does this:<br><br>FactType testEventType = session.getKnowledgeBase().getFactType("com.drools.test", "TestEvent");<br>for(int i = 0; i < 10; i++){<br> Object testEvent = testEventType.newInstance();<br>
testEventType.set(testEvent, "id", "id");<br> WorkingMemoryEntryPoint mainStream = session.getWorkingMemoryEntryPoint("test");<br> mainStream.insert(event);<br> session.fireAllRules();<br>
}<br><br>The exception I receive is:<br><br>org.drools.RuntimeDroolsException: java.lang.ClassCastException: com.drools.test.TestEvent cannot be cast to java.io.Serializable<br> at org.drools.rule.Accumulate.accumulate(Accumulate.java:172)<br>
at org.drools.reteoo.AccumulateNode.modifyTuple(AccumulateNode.java:424)<br> at org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:284)<br> at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)<br>
at org.drools.reteoo.PropagationQueuingNode$AssertAction.execute(PropagationQueuingNode.java:326)<br> at org.drools.reteoo.PropagationQueuingNode.propagateActions(PropagationQueuingNode.java:221)<br> at org.drools.reteoo.PropagationQueuingNode$PropagateAction.execute(PropagationQueuingNode.java:394)<br>
at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1486)<br> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:158)<br> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:122)<br>
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)<br> at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)<br> at com.drools.test.MyUnitTest.testEvents(EvaluationTest.java:66)<br>
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)<br> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)<br> at java.lang.reflect.Method.invoke(Unknown Source)<br>
at org.springframework.test.context.junit4.SpringTestMethod.invoke(SpringTestMethod.java:160)<br> at org.springframework.test.context.junit4.SpringMethodRoadie.runTestMethod(SpringMethodRoadie.java:233)<br> at org.springframework.test.context.junit4.SpringMethodRoadie$RunBeforesThenTestThenAfters.run(SpringMethodRoadie.java:333)<br>
at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions(SpringMethodRoadie.java:217)<br> at org.springframework.test.context.junit4.SpringMethodRoadie.runTest(SpringMethodRoadie.java:197)<br>
at org.springframework.test.context.junit4.SpringMethodRoadie.run(SpringMethodRoadie.java:143)<br> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:160)<br>
at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)<br> at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)<br> at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)<br>
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)<br> at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)<br> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:97)<br>
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)<br> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<br> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)<br>
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)<br> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)<br> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)<br>
Caused by: java.lang.ClassCastException: com.drools.test.TestEvent cannot be cast to java.io.Serializable<br> at org.drools.base.accumulators.JavaAccumulatorFunctionExecutor.accumulate(JavaAccumulatorFunctionExecutor.java:110)<br>
at org.drools.rule.Accumulate.accumulate(Accumulate.java:164)<br> ... 36 more<br><br><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> JBoss by Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a><br>