Any ideas folks ?

From: Abhay B. Chaware
Sent: Friday, June 10, 2011 12:54 PM
To: 'Rules Users List'
Subject: RE: [rules-users] Drools in non-eclipse environment

The ride’s real fun J

Got apache harmony’s beans.jar to work .. now , when I am reading the serialized knowledgebase object on android, quite obvious, it is throwing this error –

java.lang.UnsupportedOperationException: can't load this type of class file

since my serialized knowledgebase object is in java format .. and not dex. Can this serialized version be converted into .dex format using the “dx” utility – pre or post serialization ? I tried the “dx” tool on the serialized object, but it doesn’t seem to understand the format.

-abhay

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Michael Anstis
Sent: Thursday, June 09, 2011 6:37 PM
To: Rules Users List
Subject: Re: [rules-users] Drools in non-eclipse environment

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@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

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@lists.jboss.org [mailto:rules-users-bounces@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@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@lists.jboss.org [mailto:rules-users-bounces@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@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)
>
>
>
> _______________________________________________
> rules-users mailing list

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

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

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