On 9 June 2011 11:11, Abhay B. Chaware <Abhay.Chaware@kpitcummins.com> wrote:

This is what I did.

Properties properties = new Properties();
properties.put("drools.dialect.java.compiler", "JANINO");
KnowledgeBuilderConfiguration kbConfig = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration( properties, (ClassLoader[]) null );
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(kbConfig);

kbuilder.add(ResourceFactory.newInputStreamResource(is), ResourceType.DRL);

I am getting same error with KnowledgeBuilderConfiguration ..

W/System.err(27303): java.lang.NullPointerException
W/System.err(27303): at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:47)
W/System.err(27303): at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1161)
W/System.err(27303): at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:637)
W/System.err(27303): at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:267)
W/System.err(27303): at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:459)
W/System.err(27303): at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
W/System.err(27303): at com.ts.DBconnector.readKnowledgeBase(DBconnector.java:143)
W/System.err(27303): at com.first.FirstActivity.onCreate(FirstActivity.java:64)
W/System.err(27303): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
W/System.err(27303): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
W/System.err(27303): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
W/System.err(27303): at android.app.ActivityThread.access$2300(ActivityThread.java:125)

________________________________________
From: rules-users-bounces@lists.jboss.org [rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun [wolfgang.laun@gmail.com]
Sent: Thursday, June 09, 2011 2:46 PM

To: Rules Users List
Subject: Re: [rules-users] Drools in non-eclipse environment

You might try this:

Properties props = new Properties();
props.put( "drools.dialect.java.compiler", "JANINO" );

KnowledgeBuilderConfiguration kbConfig =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration( props, (ClassLoader[]) null );

Requires the janino jar in your classpath, which I have as
~/.m2/repository/janino/janino/2.5.15/janino-2.5.15.jar

-W

On 9 June 2011 10:29, Abhay B. Chaware <Abhay.Chaware@kpitcummins.com<mailto:Abhay.Chaware@kpitcummins.com>> wrote:
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@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org> [rules-users-bounces@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>] On Behalf Of Swindells, Thomas [TSwindells@nds.com<mailto:TSwindells@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@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org> [mailto:rules-users-<mailto:rules-users->
> bounces@lists.jboss.org<mailto:bounces@lists.jboss.org>] On Behalf Of Abhay B. Chaware

> Sent: 09 June 2011 08:06

> To: rules-users@lists.jboss.org<mailto:rules-users@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)
>
>
>
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> rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org>

> https://lists.jboss.org/mailman/listinfo/rules-users

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