[rules-users] Drools in non-eclipse environment

[Abhay B. Chaware]

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 at lists.jboss.org [rules-users-bounces at lists.jboss.org] On Behalf Of Swindells, Thomas [TSwindells at 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 at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of Abhay B. Chaware
> Sent: 09 June 2011 08:06
> To: rules-users at 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 at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users


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