"main" prio=10 tid=0x08b2b800 nid=0x1104 runnable [0xb6aa6000]

   java.lang.Thread.State: RUNNABLE

        at org.drools.common.DefaultFactHandle.hashCode(DefaultFactHandle.java:136)

        at org.drools.reteoo.LeftTuple.hashCode(LeftTuple.java:445)

        at org.drools.reteoo.LeftTuple.equals(LeftTuple.java:461)

        at org.drools.core.util.LeftTupleList.get(LeftTupleList.java:102)

        at org.drools.core.util.LeftTupleList.contains(LeftTupleList.java:96)

        at org.drools.reteoo.EvalConditionNode.modifyLeftTuple(EvalConditionNode.java:235)

        at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:209)

        at org.drools.reteoo.JoinNode.modifyRightTuple(JoinNode.java:221)

        at org.drools.reteoo.BetaNode.modifyObject(BetaNode.java:317)

        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:444)

        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:412)

        at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:262)

        at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:174)

        at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1392)

        at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1288)

        at org.drools.planner.examples.examination.solver.move.ExaminationMoveHelper.movePeriod(ExaminationMoveHelper.java:17)

        at org.drools.planner.examples.examination.solver.move.PeriodChangeMove.doMove(PeriodChangeMove.java:37)

        at org.drools.planner.core.localsearch.decider.DefaultDecider.doMove(DefaultDecider.java:117)

        at org.drools.planner.core.localsearch.decider.DefaultDecider.decideNextStep(DefaultDecider.java:95)

        at org.drools.planner.core.localsearch.DefaultLocalSearchSolver.solveImplementation(DefaultLocalSearchSolver.java:105)

        at org.drools.planner.core.AbstractSolver.solve(AbstractSolver.java:41)

        at org.drools.planner.benchmark.SolverBenchmarkSuite.benchmark(SolverBenchmarkSuite.java:196)

        at org.drools.planner.benchmark.XmlSolverBenchmarker.benchmark(XmlSolverBenchmarker.java:72)

        at org.drools.planner.examples.common.app.CommonBenchmarkApp.process(CommonBenchmarkApp.java:25)

        at org.drools.planner.examples.examination.app.ExaminationBenchmarkApp.main(ExaminationBenchmarkApp.java:27)

        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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:110)