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 :)
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(a)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-pac...
http://meteatamel.wordpress.com/2010/09/28/android-api-and-java-beans-pac...
Enjoy the ride ;)
2011/6/9 Abhay B. Chaware
<Abhay.Chaware@kpitcummins.com<mailto:Abhay.Chaware@kpitcummins.com>>
woo hooo ! I got past that problem :) But a new one's here now.
Looks like MVEL is not liking something :)
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@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>
[mailto: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<mailto: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>
[mailto: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<mailto: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<mailto:rules-users-bounces@lists.jboss.org>
[rules-users-bounces@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>] On
Behalf Of Wolfgang Laun [wolfgang.laun@gmail.com<mailto: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><mailto: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><mailto: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><mailto: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><mailto: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-bounces@lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>>
[mailto:rules-users-<mailto:rules-users-><mailto:rules-users-<mailto:rules-users->>
bounces@lists.jboss.org<mailto:bounces@lists.jboss.org><mailto: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><mailto: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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