[jboss-jira] [JBoss JIRA] (JBRULES-3323) Using Set in accumulate causes NPE in some scenarios
Reinis Vicups (Created) (JIRA)
jira-events at lists.jboss.org
Sat Dec 31 09:07:09 EST 2011
Using Set in accumulate causes NPE in some scenarios
----------------------------------------------------
Key: JBRULES-3323
URL: https://issues.jboss.org/browse/JBRULES-3323
Project: Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: drools-core
Affects Versions: 5.3.1.Final, 5.2.0.Final
Environment: Linux (Ubuntu Oneiric); Eclipse; JavaSE-1.6
Reporter: Reinis Vicups
Assignee: Mark Proctor
When using either "collectSet" or the full syntax (init, action, reverse, result) of "accumulate" an NPE is beeing thrown in org.drools.rule.Accumulate.reverse(final Object[] workingMemoryContext, final Object[] context, ...). Actual exception is comming from a generated(?) accumulator within the reverse() method of Accumulate.
IMPORTANT: When using Rule 2 (full syntax) I was able to replicate that the NPE is thrown during the execution of "reverse" block of "accumulate"!
I am attaching
- example rules causing NPE;
- Stack trace;
- test project as soon as I have set it up;
- Rule 1 causing NPE
{code}rule "Sub optimal resource parallelism"
when
$project : Project($optimalResourceParallelism : optimalResourceParallelism)
$assignment : Assignment(project == $project, $leftId : id, resource != null, $leftResource : resource)
exists Assignment(project == $project, id != $leftId, resource != null && != $leftResource)
$resourceParallelism : Set ((size + 1) != $optimalResourceParallelism)
from accumulate ( $otherAssignment : Assignment(project == $project, id != $leftId, resource != null && != $leftResource, $resource : resource),
collectSet($resource) )
then
insertLogical(new IntConstraintOccurrence("sub-optimal resource parallelism", ConstraintType.NEGATIVE_SOFT
, Math.abs($optimalResourceParallelism - ($resourceParallelism.size() + 1)), $assignment));
System.out.println("Sub optimal resource parallelism detected. Assignment: " + $assignment.getId()
+ " optimalParallelism is: " + $optimalResourceParallelism + " and actual: " + ($resourceParallelism.size() + 1));
end{code}
- Rule 2 causing NPE
{code}rule "Sub optimal resource parallelism"
when
$project : Project($optimalResourceParallelism : optimalResourceParallelism)
$assignment : Assignment(project == $project, $leftId : id, resource != null, $leftResource : resource)
exists Assignment(project == $project, id != $leftId, resource != null && != $leftResource)
$resourceParallelism : Set ((size + 1) != $optimalResourceParallelism)
from accumulate ( $otherAssignment : Assignment(project == $project, id != $leftId, resource != null && != $leftResource, $resource : resource),
init( Set<Resource> resources = new HashSet<Resource>(); ),
action( resources.add($resource); ),
reverse( resources.remove($resource); ),
result( resources.size(); ) )
then
insertLogical(new IntConstraintOccurrence("sub-optimal resource parallelism", ConstraintType.NEGATIVE_SOFT
, Math.abs($optimalResourceParallelism - ($resourceParallelism.size() + 1)), $assignment));
System.out.println("Sub optimal resource parallelism detected. Assignment: " + $assignment.getId()
+ " optimalParallelism is: " + $optimalResourceParallelism + " and actual: " + ($resourceParallelism.size() + 1));
end{code}
- Stack trace
{code}org.drools.RuntimeDroolsException: java.lang.NullPointerException
at org.drools.rule.Accumulate.reverse(Accumulate.java:217)
at org.drools.reteoo.AccumulateNode.removeMatch(AccumulateNode.java:888)
at org.drools.reteoo.AccumulateNode.modifyRightTuple(AccumulateNode.java:554)
at org.drools.reteoo.BetaNode.modifyObject(BetaNode.java:431)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:468)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:436)
at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:149)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:468)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:436)
at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:284)
at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:271)
at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:465)
at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:959)
at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:932)
at org.drools.planner.core.heuristic.selector.variable.PlanningValueWalker.changeWorkingValue(PlanningValueWalker.java:125)
at org.drools.planner.core.heuristic.selector.variable.PlanningValueWalker.walk(PlanningValueWalker.java:112)
at org.drools.planner.core.heuristic.selector.variable.PlanningVariableWalker.walk(PlanningVariableWalker.java:130)
at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:62)
at org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:62)
at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:166)
at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:138)
at de.orbitx.retena.domain.ScheduleTest.schedule(ScheduleTest.java:227)
at de.orbitx.retena.domain.ScheduleTest.testGetScoreTrivialScenario(ScheduleTest.java:78)
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 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$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103)
at $Proxy0.invoke(Unknown Source)
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150)
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69)
Caused by: java.lang.NullPointerException
at org.drools.base.accumulators.CollectSetAccumulateFunction.reverse(CollectSetAccumulateFunction.java:123)
at org.drools.base.accumulators.JavaAccumulatorFunctionExecutor.reverse(JavaAccumulatorFunctionExecutor.java:130)
at org.drools.rule.Accumulate.reverse(Accumulate.java:208)
... 51 more{code}
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