Details
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Bug
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Resolution: Done
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Major
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5.4.0.CR1
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None
Description
The following unit test exhibits a class cast exception.
The JUnit test code, added to AccumulateTest. It crashes on the last line of the test method.
@Test
public void testAccumulateReverseModifyInsertLogical3() throws Exception {
// read in the source
final Reader reader = new InputStreamReader( getClass().getResourceAsStream( "test_AccumulateReverseModifyInsertLogical3.drl" ) );
final RuleBase ruleBase = loadRuleBase( reader );
final WorkingMemory wm = ruleBase.newStatefulSession();
wm.insert( new Cheese( "stilton", 10 ) );
wm.insert( new Person( "Alice", "brie" ) );
wm.insert( new Person( "Bob", "stilton" ) );
}
This is the rule that causes the crash:
package org.drools.test;
import org.drools.Cheese;
import org.drools.Person;
rule "Class cast causer"
when
$person : Person( $likes : likes )
$total : Number() from accumulate( $p : Person(likes != $likes, $l : likes) and $c : Cheese( type == $l ),
min($c.getPrice()) )
($p2 : Person(name == "nobody") or $p2 : Person(name == "Doug"))
then
System.out.println($p2.getName());
end
And finally this is the resulting stack trace:
org.drools.RuntimeDroolsException: java.lang.ClassCastException: org.drools.Person cannot be cast to org.drools.Cheese at org.drools.rule.Accumulate.accumulate(Accumulate.java:187) at org.drools.reteoo.AccumulateNode.addMatch(AccumulateNode.java:852) at org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:274) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382) at org.drools.reteoo.RightInputAdapterNode.assertLeftTuple(RightInputAdapterNode.java:142) at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:197) at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:72) at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:98) at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:197) at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:72) at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:147) 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:337) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847) at org.drools.integrationtests.AccumulateTest.testAccumulateReverseModifyInsertLogical3(AccumulateTest.java:622) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 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: java.lang.ClassCastException: org.drools.Person cannot be cast to org.drools.Cheese at org.drools.test.Rule_Class_cast_causer_5a3e8961c4834e3d9c174ff2f2d98c7bAccumulateExpression0Invoker.evaluate(Rule_Class_cast_causer_5a3e8961c4834e3d9c174ff2f2d98c7bAccumulateExpression0Invoker.java:21) at org.drools.base.accumulators.JavaAccumulatorFunctionExecutor.accumulate(JavaAccumulatorFunctionExecutor.java:107) at org.drools.rule.Accumulate.accumulate(Accumulate.java:178) ... 43 more
My naive theory is that the "and" is causing an off-by-one in the compiler, and it's referencing the value assigned to $p when dereferencing $c in the min().
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