Re: [rules-users] NullPointerException when load file rules

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(a)gmail.com&gt;: > 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(a)nds.com&gt; > 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(a)lists.jboss.org [mailto:rules-users- >> > bounces(a)lists.jboss.org] On Behalf Of jjmartinez >> > Sent: 10 January 2012 17:05 >> > To: rules-users(a)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) >> >> >> >> ************************************************************************************** >> This message is confidential and intended only for the addressee. 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