[rules-users] Drools in non-eclipse environment
Michael Anstis
michael.anstis at gmail.com
Thu Jun 9 09:07:16 EDT 2011
http://meteatamel.wordpress.com/2010/08/25/android-api-and-java-beans-package/
http://meteatamel.wordpress.com/2010/09/28/android-api-and-java-beans-package-2/
Enjoy the ride ;)
2011/6/9 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>
> woo hooo ! I got past that problem J But a new one’s here now.
>
>
>
> Looks like MVEL is not liking something J
>
>
>
>
>
>
>
> W/dalvikvm(29977): VFY: unable to resolve static method 164:
> Ljava/beans/Introspector;.decapitalize (Ljava/lang/String;)Ljava/lang
>
> /String;
>
> W/dalvikvm(29977): threadid=1: thread exiting with uncaught exception
> (group=0x40020ac0)
>
> E/AndroidRuntime(29977): FATAL EXCEPTION: main
>
> E/AndroidRuntime(29977): java.lang.NoClassDefFoundError:
> java.beans.Introspector
>
> E/AndroidRuntime(29977): at
> org.drools.core.util.asm.ClassFieldInspector.calcFieldName(ClassFieldInspector.java:298)
>
> E/AndroidRuntime(29977): at
> org.drools.core.util.asm.ClassFieldInspector.addToMapping(ClassFieldInspector.java:216)
>
> E/AndroidRuntime(29977): at
> org.drools.core.util.asm.ClassFieldInspector.processClassWithoutByteCode(ClassFieldInspector.ja
>
> va:148)
>
> E/AndroidRuntime(29977): at
> org.drools.core.util.asm.ClassFieldInspector.<init>(ClassFieldInspector.java:83)
>
> E/AndroidRuntime(29977): at
> org.drools.core.util.asm.ClassFieldInspector.<init>(ClassFieldInspector.java:64)
>
> E/AndroidRuntime(29977): at
> org.drools.base.ClassFieldAccessorFactory.getClassFieldReader(ClassFieldAccessorFactory.java:11
>
> 8)
>
> E/AndroidRuntime(29977): at
> org.drools.base.ClassFieldAccessorCache$CacheEntry.getReadAccessor(ClassFieldAccessorCache.java
>
> :168)
>
> E/AndroidRuntime(29977): at
> org.drools.base.ClassFieldAccessorCache.getReadAcessor(ClassFieldAccessorCache.java:101)
>
> E/AndroidRuntime(29977): at
> org.drools.base.ClassFieldAccessorStore.wire(ClassFieldAccessorStore.java:404)
>
> E/AndroidRuntime(29977): at
> org.drools.base.ClassFieldAccessorStore.wire(ClassFieldAccessorStore.java:374)
>
> E/AndroidRuntime(29977): at
> org.drools.common.AbstractRuleBase.readExternal(AbstractRuleBase.java:295)
>
> E/AndroidRuntime(29977): at
> org.drools.reteoo.ReteooRuleBase.readExternal(ReteooRuleBase.java:236)
>
> E/AndroidRuntime(29977): at
> org.drools.impl.KnowledgeBaseImpl.readExternal(KnowledgeBaseImpl.java:108)
>
> E/AndroidRuntime(29977): at
> java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2127)
>
> E/AndroidRuntime(29977): at
> java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:929)
>
> E/AndroidRuntime(29977): at
> java.io.ObjectInputStream.readObject(ObjectInputStream.java:2285)
>
> E/AndroidRuntime(29977): at
> java.io.ObjectInputStream.readObject(ObjectInputStream.java:2240)
>
> E/AndroidRuntime(29977): at
> com.ts.DBconnector.execPackageByPath(DBconnector.java:219)
>
> E/AndroidRuntime(29977): at
> com.first.FirstActivity.onCreate(FirstActivity.java:77)
>
> E/AndroidRuntime(29977): at
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
>
> E/AndroidRuntime(29977): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
>
> E/AndroidRuntime(29977): at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
>
> E/AndroidRuntime(29977): at
> android.app.ActivityThread.access$2300(ActivityThread.java:125)
>
> E/AndroidRuntime(29977): at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
>
> E/AndroidRuntime(29977): at
> android.os.Handler.dispatchMessage(Handler.java:99)
>
> E/AndroidRuntime(29977): at android.os.Looper.loop(Looper.java:123)
>
> E/AndroidRuntime(29977): at
> android.app.ActivityThread.main(ActivityThread.java:4627)
>
> E/AndroidRuntime(29977): at
> java.lang.reflect.Method.invokeNative(Native Method)
>
> E/AndroidRuntime(29977): at
> java.lang.reflect.Method.invoke(Method.java:521)
>
> E/AndroidRuntime(29977): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
>
> E/AndroidRuntime(29977): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
>
> E/AndroidRuntime(29977): at dalvik.system.NativeStart.main(Native
> Method)
>
>
>
>
>
>
> ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Michael Anstis
> *Sent:* Thursday, June 09, 2011 4:51 PM
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools in non-eclipse environment
>
>
>
> Great news :)
>
> Please do feedback... if you get it working I'll make a blog entry on your
> behalf as you are not the first (or last) to try Drools on Android.
>
> With kind regards,
>
> Mike
>
> 2011/6/9 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>
>
> That’s exactly what I am trying out at the moment .. option – b.
> Pre-compile, serialize and unserialize …I’ll share the results.
>
> Also rule file’s there at the location mentioned. So that’s not a problem.
>
> I’ve gone through the blog you mentioned … and as you indicated, it’s only
> jbpm .. no rules …
>
>
>
> thanks
>
> abhay
> ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Michael Anstis
> *Sent:* Thursday, June 09, 2011 4:07 PM
>
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] Drools in non-eclipse environment
>
>
>
> Preparing to be shouted down, but isn't it impossible to compile DRL on
> Android and the suggestion is to load pre-serialised KnowledgeBases?
>
> Also, as another observation, are you sure the DRL was indeed found and the
> NPE is not caused by
> "com.ts.DBconnector.readKnowledgeBase(DBconnector.java:143)" perhaps passing
> a null to KnowledgeBuilder?
>
> Have you looked at
> http://blog.athico.com/2011/03/jbpm5-lightweight-running-on-android.html,
> which might give some pointers - although it is only jBPM and not rules
> themselves.
>
> With kind regards,
>
> Mike
>
> On 9 June 2011 11:11, Abhay B. Chaware <Abhay.Chaware at 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 at lists.jboss.org [
> rules-users-bounces at lists.jboss.org] On Behalf Of Wolfgang Laun [
> wolfgang.laun at 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 at kpitcummins.com
> <mailto:Abhay.Chaware at 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 at lists.jboss.org<mailto:
> rules-users-bounces at lists.jboss.org> [rules-users-bounces at lists.jboss.org
> <mailto:rules-users-bounces at lists.jboss.org>] On Behalf Of Swindells,
> Thomas [TSwindells at nds.com<mailto: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> [mailto:rules-users-<mailto:
> rules-users->
> > bounces at lists.jboss.org<mailto:bounces at lists.jboss.org>] On Behalf Of
> Abhay B. Chaware
>
> > Sent: 09 June 2011 08:06
>
> > To: rules-users at lists.jboss.org<mailto: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<mailto:rules-users at lists.jboss.org>
>
> > https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
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