10:36 p.m.
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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7:06 p.m.
We have a number of unit tests for expressions:
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
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-...
Mark
On 7 May 2014, at 21:36, rogerL <roger(a)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...
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Nabble.com.
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5:45 p.m.
As suggested, I wrote some tests based on methods defined in the given
class. That is, I extend from CommonTestMethodBase and used
"loadKnowledgeBaseFromString(str)" to define the base for my KieSession. I
was unable to reproduce the exception. I went through several cycles
altering initializations, stripping down the rule, so forth but still to no
avail.
Some of the steps I followed:
- Eliminate test harness. I added a main in my test class and simply
instantiated that class and called the method directly.
- Executed in different environment. Changed from Intellij Idea IDE, to
Eclipse IDE. Have not tried command line.
- In my application, I create the declared class externally and inject it
into the engine The test method, on the other hand, injects the declared
class via a high salience "init" rule. As such, I tried same approach in my
application.
- In my application, removed all other rules, global, unused declarations.
Further, I pruned down the offending rule to rudimentary instructions.
I have yet to dive into the drools/kie code to identify the differences, if
any, between the test and application engine and rule initialization paths.
Before I do, are there any suggestions on what other route I might take?
Thank you,
Roger
On Sat, May 10, 2014 at 11:06 AM, Mark Proctor <mproctor(a)codehaus.org>wrote:
We have a number of unit tests for expressions:
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
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-...
Mark
On 7 May 2014, at 21:36, rogerL <roger(a)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...
> Sent from the Drools: Developer (committer) mailing list mailing list
archive at Nabble.com.
> _______________________________________________
> rules-dev mailing list
> rules-dev(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-dev
_______________________________________________
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--
Roger Lefebvre
President, Precipice Technologies Inc.
(e) roger(a)precipicetech.com
(c) 403 466 2622
(f) 403 475 0566
3888
days inactive
3894
days old
2 comments
3 participants
participants (3)
-
Mark Proctor -
Roger Lefebvre -
rogerL