Re: [rules-users] Drools in non-eclipse environment

I am using drools 5.1.0 Let me explain what I am trying to do. I am trying to write a drools app on to android platform. In my app, I have added following jars in the application classpath - antlr-runtime.jar drools-api.jar drools-compiler.jar drools-core.jar mvel2.jar Do I need any other jar files ? upon drilling down into the Null Pointer Exception, it appears that it is throwing NPE at following line inside RuleBuilder.java RuleConditionBuilder builder = (RuleConditionBuilder)context.getDialect().getBuilder(ruleDescr.getLhs().getClass()); and on further drilling, I found that "context.getDialect()" is retuning NULL. Then I put some debug inside PackageBuilder.java upon drilling down for the error, found out that it is not able to set the context's dialect. ctr.getDialect(pkgRegistry.getDialect()) gives "null" ... DialectCompiletimeRegistry ctr = pkgRegistry.getDialectCompiletimeRegistry(); RuleBuildContext context = new RuleBuildContext(this, ruleDescr, ctr, pkg, ctr.getDialect(pkgRegistry.getDialect())); Is there any default setting /configuration that I am obviously missing ? what could be the problem ? -abhay ________________________________________ From: rules-users-bounces(a)lists.jboss.org [ rules-users-bounces(a)lists.jboss.org] On Behalf Of Swindells, Thomas [ TSwindells(a)nds.com] Sent: Thursday, June 09, 2011 1:40 PM To: Rules Users List Subject: Re: [rules-users] Drools in non-eclipse environment Which version of drools is this? For drools 5.0.1 we just use maven to resolve the dependencies for us and it works fine. I can't obviously see any eclipse compiler in the jars that we distribute with our application. Thomas > -----Original Message----- > From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users- > bounces(a)lists.jboss.org] On Behalf Of Abhay B. Chaware > Sent: 09 June 2011 08:06 > To: rules-users(a)lists.jboss.org > Subject: [rules-users] Drools in non-eclipse environment > > Has anyone tried using drools in non-eclipse env ? meaning that > org.eclipse.jdt.core_3.5.1.v_972_R35x.jar is not in the classpath ? > > Documentation says this : > > (http://docs.huihoo.com/drools/4.0.7/ch02s05.html) > > if you do not have Eclipse JDT Core in your classpath you must override the > compiler setting before you instantiate this PackageBuilder, you can either > do that with a packagebuilder properties file the ChainedProperties class will > find, or you can do it programmatically as shown below; note this time I use > properties to inject the value for startup. > > They also provide an example, but I am not able to figure out exactly how to > use this example/info. > > Here is my code : > > KnowledgeBuilder kbuilder = > KnowledgeBuilderFactory.newKnowledgeBuilder(); > kbuilder.add(ResourceFactory.newInputStreamResource(is), > ResourceType.DRL); > > where "is" is input stream containing the rule file ( .drl) > > How do I override the compiler setting ? > > I am getting a null pointer exception ( see below ) and I suspect that > overriding the packagebuilderconfiguration will fix it ? > > W/System.err(25511): java.lang.NullPointerException > W/System.err(25511): at > org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:47) > W/System.err(25511): at > org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1161) > W/System.err(25511): at > org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:637) > W/System.err(25511): at > org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java > :267) > W/System.err(25511): at > org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder > .java:459) > W/System.err(25511): at > org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.ja > va:28) > W/System.err(25511): at > com.ts.DBconnector.readKnowledgeBase(DBconnector.java:146) > > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users ************************************************************************************** This message is confidential and intended only for the addressee. 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