We have a number of unit tests for expressions: https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/compiler/integrationtests/TimerAndCalendarTest.java
Could you add a unit test to demonstrate your problem, and submit it as a pull request? http://docs.jboss.org/drools/release/5.5.0.Final/droolsjbpm-introduction-docs/html/gettingstarted.html Mark On 7 May 2014, at 21:36, rogerL <ro...@precipicetech.com> wrote: > 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) > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Expression-Timer-NPE-Drools-6-0-1-Final-tp4029469.html > Sent from the Drools: Developer (committer) mailing list mailing list archive > at Nabble.com. > _______________________________________________ > rules-dev mailing list > rules-dev@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev _______________________________________________ rules-dev mailing list rules-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev
