[rules-dev] Expression Timer NPE Drools 6.0.1.Final

[rogerL]

Hello,

I'm encountering an NPE when attempting to use and expression timer in my
rule.
env:
Drools 6.0.1.Final
OS Maverick
IDE Intellij Idea
Java 7

Given the ebb and flow nature of the facts in the system, we want to be able
to control the cycles dynamically. Hence the desire to use the expression
timer.
The expression that I tried is based on the 6.0.1 documentation.
That is, something of the form *Timer(expr: $d, $p)*
In an effort to get beyond the NPE, I tried playing around with the
parameters by using combinations of both longs and appropriately formatted
strings (e.g. 10s, 1m, etc), and using only the delay.
I saw mention that a semicolon should follow the expression. That equally
failed.
The interval and cron timer variations, however, both work.


The .drl and exception are:

declare SystemControlData
    isEnabled : boolean = false
    delay   : long = 30
    period  : long = 60000
    maxCallQueueDepth : int = 1
end


rule "If the system is enabled start campaign check at specified interval"
    agenda-group "system_criteria"
//    auto-focus true
    salience 20
//    timer( expr: $d, $p ) throws NPE
//    timer( expr: $d; ) throws NPE
    timer(cron:0/5 * * * * ?)
when
    SystemControlData(isEnabled==true, $d: delay, $p:period,
maxCallQueueDepth>0)
then
    drools.setFocus( "campaign_criteria" );
end



Exception in thread "SimpleAsyncTaskExecutor-1"
java.lang.NullPointerException
	at
org.drools.core.base.mvel.MVELCompilationUnit.createFactory(MVELCompilationUnit.java:262)
	at
org.drools.core.base.mvel.MVELCompilationUnit.getFactory(MVELCompilationUnit.java:276)
	at
org.drools.core.base.mvel.MVELObjectExpression.getValue(MVELObjectExpression.java:76)
	at org.drools.core.time.TimeUtils.evalTimeExpression(TimeUtils.java:140)
	at
org.drools.core.time.impl.ExpressionIntervalTimer.createTrigger(ExpressionIntervalTimer.java:151)
	at
org.drools.core.phreak.PhreakTimerNode.createTrigger(PhreakTimerNode.java:260)
	at
org.drools.core.phreak.PhreakTimerNode.scheduleLeftTuple(PhreakTimerNode.java:230)
	at
org.drools.core.phreak.PhreakTimerNode.doLeftInserts(PhreakTimerNode.java:93)
	at org.drools.core.phreak.PhreakTimerNode.doNode(PhreakTimerNode.java:69)
	at
org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:357)
	at
org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
	at
org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
	at
org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:200)
	at
org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:67)
	at
org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935)
	at
org.drools.core.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1160)
	at
org.drools.core.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:1002)
	at
org.drools.core.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:978)
	at
org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:273)



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