<html><body><div style="color:#000; background-color:#fff; font-family:tahoma, new york, times, serif;font-size:10pt"><div>Hi,</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;">When starting the planning solver I sometimes get the error as listed beneath.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;">I think it happens about 1 out of 5 runs.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;">It doesn't seem to have much influence on the solving process as everything continues normally (I think).</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent;
font-style: normal;">I do not use any mvel expressions to my knowledge.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;">Anyway, it would be nice to understand why this happens and how to get this resolved.<br><span></span></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;"><br><span></span></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: tahoma,new york,times,serif; background-color: transparent; font-style: normal;"><span>Exception in thread "Thread-1" java.lang.NullPointerException<br> at
org.mvel2.ast.IntSub.getReducedValueAccelerated(IntSub.java:17)<br> at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:38)<br> at org.mvel2.ast.Substatement.getReducedValueAccelerated(Substatement.java:44)<br> at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:108)<br> at org.mvel2.ast.And.getReducedValueAccelerated(And.java:34)<br> at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)<br> at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123)<br> at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119)<br> at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113)<br> at org.mvel2.MVEL.executeExpression(MVEL.java:930)<br> at
org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:70)<br> at org.drools.rule.constraint.MvelConditionEvaluator.ensureBranchEvaluation(MvelConditionEvaluator.java:117)<br> at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:102)<br> at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:90)<br> at org.drools.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:82)<br> at org.drools.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:270)<br> at org.drools.rule.constraint.MvelConstraint.access$200(MvelConstraint.java:51)<br> at org.drools.rule.constraint.MvelConstraint$ConditionJitter.run(MvelConstraint.java:250)<br> at
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)<br> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)<br> at java.lang.Thread.run(Unknown Source)</span></div><div> <br>Thanks,<br><br>Michiel<br></div><div>-----------------<br>http://www.codessentials.com - Your essential software, for free!<br>Follow us at http://twitter.com/#!/Codessentials</div></div></body></html>