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The DRL uses mvel under the covers.<br>
<br>
Looks like a bug in mvel, possibly in the JIT compilation (which
could explain the 1 out of 5 runs behaviour).<br>
File an issue in our jira: include the stacktrace, versions of
drools-core and the mvel jar<br>
and - if possible - the rule to which it applies.<br>
<br>
<div class="moz-cite-prefix">Op 16-01-13 09:59, Michiel Vermandel
schreef:<br>
</div>
<blockquote
cite="mid:1358326770.87544.YahooMailNeo@web161302.mail.bf1.yahoo.com"
type="cite">
<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>
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