[rules-users] NullPointerException when load file rules

Tue Jan 10 12:35:58 EST 2012

Oh.. I see what is happening here.. the Default dialects and session
configurations are not being loaded by your OSGI environment :)
It took me a while to find that out so I hope this comment helps you
to save some valuable time.
Solution: you need to add inside your project that is loading the
rules the following file:
META-INF/drools.packagebuilder.conf

That contains the following content:
drools.dialect.default = java
drools.dialect.java =
org.drools.rule.builder.dialect.java.JavaDialectConfiguration
drools.dialect.java.compiler = ECLIPSE

drools.dialect.mvel =
org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration
drools.dialect.mvel.strict = true
drools.dialect.mvel.langLevel = 4

drools.accumulate.function.average =
org.drools.base.accumulators.AverageAccumulateFunction
drools.accumulate.function.max =
org.drools.base.accumulators.MaxAccumulateFunction
drools.accumulate.function.min =
org.drools.base.accumulators.MinAccumulateFunction
drools.accumulate.function.count =
org.drools.base.accumulators.CountAccumulateFunction
drools.accumulate.function.sum =
org.drools.base.accumulators.SumAccumulateFunction
drools.accumulate.function.collectList =
org.drools.base.accumulators.CollectListAccumulateFunction
drools.accumulate.function.collectSet =
org.drools.base.accumulators.CollectSetAccumulateFunction

drools.evaluator.coincides =
org.drools.base.evaluators.CoincidesEvaluatorDefinition
drools.evaluator.before = org.drools.base.evaluators.BeforeEvaluatorDefinition
drools.evaluator.after = org.drools.base.evaluators.AfterEvaluatorDefinition
drools.evaluator.meets = org.drools.base.evaluators.MeetsEvaluatorDefinition
drools.evaluator.metby = org.drools.base.evaluators.MetByEvaluatorDefinition
drools.evaluator.overlaps =
org.drools.base.evaluators.OverlapsEvaluatorDefinition
drools.evaluator.overlappedby =
org.drools.base.evaluators.OverlappedByEvaluatorDefinition
drools.evaluator.during = org.drools.base.evaluators.DuringEvaluatorDefinition
drools.evaluator.includes =
org.drools.base.evaluators.IncludesEvaluatorDefinition
drools.evaluator.starts = org.drools.base.evaluators.StartsEvaluatorDefinition
drools.evaluator.startedby =
org.drools.base.evaluators.StartedByEvaluatorDefinition
drools.evaluator.finishes =
org.drools.base.evaluators.FinishesEvaluatorDefinition
drools.evaluator.finishedby =
org.drools.base.evaluators.FinishedByEvaluatorDefinition
drools.evaluator.equality =
org.drools.base.evaluators.EqualityEvaluatorsDefinition
drools.evaluator.comparable =
org.drools.base.evaluators.ComparableEvaluatorsDefinition
drools.evaluator.set = org.drools.base.evaluators.SetEvaluatorsDefinition
drools.evaluator.matches =
org.drools.base.evaluators.MatchesEvaluatorsDefinition
drools.evaluator.soundslike =
org.drools.base.evaluators.SoundslikeEvaluatorsDefinition

That is provided by drools-compiler.jar or drools-core.jar (I don't
have the code here) but it's not being picked up by the OSGI
container.

Cheers

2012/1/10 elMateo <soyelmateo at gmail.com>:
> I'm using Drools 5.4.0 Beta 1 and my DRL is the Hello World of Drools :)
> (all my application is the Hello World of Drools, because I'm trying to do a
> OSGi bundle with this application).
>
> In my OSGi framework is running drools.core, drools.compiler and
> knowledge-api, and others bundles.
>
> Thanks for reply me.
>
> On Tue, Jan 10, 2012 at 6:15 PM, Swindells, Thomas <TSwindells at nds.com>
> wrote:
>>
>> Looking at the stack trace, if you are on the same version as drools as me
>> it looks like it is this line
>> this.rule.setDialect( getDialect().getId() );
>>
>> The most likely reason is your DRL isn't valid - perhaps where you are
>> specifying the dialect, or it could be your
>> Dependencies aren't right or something.
>> Which version of drools are you using. Have you tried reducing your DRL
>> file to the minimum that generates the error - then post that DRL if you
>> need further help.
>>
>> Thomas
>>
>> > -----Original Message-----
>> > From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
>> > bounces at lists.jboss.org] On Behalf Of jjmartinez
>> > Sent: 10 January 2012 17:05
>> > To: rules-users at lists.jboss.org
>> > Subject: Re: [rules-users] NullPointerException when load file rules
>> >
>> > Anybody can help me? I don't know why my application show these errors.
>> >
>> > Thanks in advance!
>> >
>> > java.lang.NullPointerException
>>        at
>> org.drools.rule.builder.RuleBuildContext.<init>(RuleBuildContext.java:88)
>>        at
>> org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1149)
>>        at
>> org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:636)
>>        at
>> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:266)
>>        at
>> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:458)
>>        at
>> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
>>        at drools.ejemplos.DroolsTest.readKnowledgeBase(DroolsTest.java:85)
>>        at drools.ejemplos.DroolsTest.execute(DroolsTest.java:64)
>>        at drools.ejemplos.DroolsTest.<init>(DroolsTest.java:56)
>>        at drools.ejemplos.Activator.start(Activator.java:14)
>>        at
>> org.knopflerfish.framework.BundleImpl.start0(BundleImpl.java:356)
>>        at
>> org.knopflerfish.framework.BundleThread.run(BundleThread.java:107)
>>
>>
>>
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