[rules-users] NullPointerException when calling Scan manually

[Brecht De Rooms]

Dear,

thanks for the quick response, I lost track of this entry due to some  
deadlines. I was planning to compile a package with all the necessary code  
but as mentioned, the issue only shows up periodically and currently I can  
not reproduce it anymore. A while back I wrote a hack that simply retries  
when the scanner fails and in the mean time, the code changed quite a bit.  
I have placed a giant debug statement in that hack to make sure that I  
notice it when it happens again. If it does I will provide you with the  
code.

Kind Regards,
Brecht


On Thu, 27 Feb 2014 13:43:47 +0100, Davide Sottara <dsotty at gmail.com>  
wrote:

> Could you please share the unit test?
> Thanks
> Davide
>
> On 02/27/2014 11:42 AM, Brecht De Rooms wrote:
>> Dear Drools users,
>>
>> I just merged all my code to Drools 6.0.1 and I am happy to see that it  
>> is
>> more stable. Several issues I had with 5.6.x do not present themselves  
>> in
>> 6.0.1. I am still stuck on one bug however that occurs randomly. I  
>> wrote a
>> unit test in which I deploy new rules and then call scanNow. Often the
>> unit test succeeds, but sometimes it throws this nullpointer exception.
>>
>>
>> java.lang.NullPointerException
>> 	at
>> org.drools.core.rule.Package.getRulesGeneratedFromResource(Package.java:668)
>> 	at
>> org.drools.core.rule.Package.removeRulesGeneratedFromResource(Package.java:658)
>> 	at
>> org.drools.core.reteoo.ReteooRuleBase.removeObjectsGeneratedFromResource(ReteooRuleBase.java:1653)
>> 	at
>> org.drools.compiler.compiler.PackageBuilder.removeObjectsGeneratedFromResource(PackageBuilder.java:4150)
>> 	at
>> org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:149)
>> 	at
>> org.kie.scanner.KieRepositoryScannerImpl.updateKieModule(KieRepositoryScannerImpl.java:214)
>> 	at
>> org.kie.scanner.KieRepositoryScannerImpl.scanNow(KieRepositoryScannerImpl.java:204)
>> 	at derooms.be.engine.RuleEngine.scanNow(RuleEngine.java:111)
>> 	at
>> derooms.be.engine.ruleDeployment.RulesPackageWriter.deployRules(RulesPackageWriter.java:104)
>> 	at
>> derooms.be.engine.ruleDeployment.RulesPackageWriter.addRules(RulesPackageWriter.java:84)
>> 	at
>> derooms.be.engine.dynamicRuleWatcher.RuleFileHandler.handleModifiedFile(RuleFileHandler.java:50)
>> 	at
>> derooms.be.engine.dynamicRuleWatcher.RulesWatcherRunnable.run(RulesWatcherRunnable.java:105)
>> 	at java.lang.Thread.run(Thread.java:744)
>>
>>
>> Does anyone have an idea what the problem might be?
>> Kind Regards,
>> Brecht
>>
>> -------------------------------------------------------------
>> Brecht De Rooms
>> Phd Student @ WISE
>> Department of Computer Science
>> Vrije Universiteit Brussel
>> Pleinlaan 2, B-1050 Brussels, Belgium
>>
>> office: 10 G 731f
>> phone: +32 2 629 37 49
>> email: bderooms at vub.ac.be
>> -------------------------------------------------------------
>>
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>
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-- 
-------------------------------------------------------------
Brecht De Rooms
Phd Student @ WISE
Department of Computer Science
Vrije Universiteit Brussel
Pleinlaan 2, B-1050 Brussels, Belgium

office: 10 G 731f
phone: +32 2 629 37 49
email: bderooms at vub.ac.be
-------------------------------------------------------------

---
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