Using multiple Collect() From result in null pointer exception
by Hezi Stern
I have encountered the following issue when running a rule that has more
than 1 collect from a same collection.
I have the following two rules:
rule "filter sentences based on existence of attributes"
when
IPhoneQueryCmd(State.POPULATE == state,
$tidt: targetId)
$attributeFilteredSentences: ArrayList()
from collect (IPhoneSentences.Sentence(
( (descriptor.targetPrivatename == false) || (descriptor.targetPrivatename
== $cmt.sentenceFilters.targetPrivatename) ) &&
( (descriptor.targetSurename == false) || (descriptor.targetSurename ==
$cmt.sentenceFilters.targetSurename) ) &&
( (descriptor.targetFullname == false) || (descriptor.targetFullname ==
$cmt.sentenceFilters.targetFullname) ) &&
( (descriptor.requesterPrivatename == false) ||
(descriptor.requesterPrivatename ==
$cmt.sentenceFilters.requesterPrivatename) ) &&
( (descriptor.requesterSurename == false) || (descriptor.requesterSurename
== $cmt.sentenceFilters.requesterSurenamename) ) &&
( (descriptor.requesterFullname == false) || (descriptor.requesterFullname
== $cmt.sentenceFilters.requesterFullname) ) &&
( (descriptor.time == false) || (descriptor.time ==
$cmt.sentenceFilters.time) ) &&
( (descriptor.subject == false) || (descriptor.subject == $cmt.subject) )
))
then
end
rule "Iphone targets information update - QUERY_AVAILABILITY" extends
"filter sentences based on existence of attributes"
when
$qc: IPhoneQueryCmd(State.POPULATE == state, $tid:
targetId)
$cm: ConditionMatrix($taskId: taskId,
targetId ==
$tid,
contextIntention
== EContextIntention.QUERY_AVAILABILITY,
$timeConstraintType: requesterConstraint.constraintRequestType)
$targetResponse: ArrayList()
from collect
(IPhoneSentences.Sentence(descriptor.intentions.intention contains
EContextIntention.QUERY_AVAILABILITY.name)
from $attributeFilteredSentences)
then
//do something
End
This works fine but once I wish to add a second filtered ArrayList using
$attributeFilteredSentences I get a null pointer exception.
For example I will add an exact similar filter condition but change the
result var name (I called it $dummyVar)
rule "Iphone targets information update - QUERY_AVAILABILITY" extends
"filter sentences based on existence of attributes"
when
$qc: IPhoneQueryCmd(State.POPULATE == state, $tid:
targetId)
$cm: ConditionMatrix($taskId: taskId,
targetId ==
$tid,
contextIntention
== EContextIntention.QUERY_AVAILABILITY,
$timeConstraintType: requesterConstraint.constraintRequestType)
$targetResponse: ArrayList()
from collect
(IPhoneSentences.Sentence(descriptor.intentions.intention contains
EContextIntention.QUERY_AVAILABILITY.name)
from $attributeFilteredSentences)
$dummyVar: ArrayList()
from collect
(IPhoneSentences.Sentence(descriptor.intentions.intention contains
EContextIntention.QUERY_AVAILABILITY.name)
from $attributeFilteredSentences)
then
//do something
End
In this case I get the following exception stack:
org.drools.runtime.rule.ConsequenceException: rule: Iphone dialog sentence -
QUERY_AVAILABILITY
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleExcept
ion(DefaultConsequenceExceptionHandler.java:39)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:927)
at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856)
at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:785)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:751)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeS
essionImpl.java:218)
at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSess
ionImpl.java:302)
at
com.delegatecom.task.TaskStatelessSession.testRunRules(TaskStatelessSession.
java:122)
at
com.delegatecom.task.TaskStatelessSession.internalTestNextStep(TaskStateless
Session.java:98)
at
com.delegatecom.task.TaskStatelessSession.testNextStep(TaskStatelessSession.
java:76)
at com.delegatecom.test.AtoB.testStatelessRule(AtoB.java:99)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.
java:44)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.j
ava:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.ja
va:41)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.jav
a:20)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.jav
a:76)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.jav
a:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28
)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestRef
erence.java:46)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:3
8)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu
nner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu
nner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.
java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner
.java:197)
Caused by: java.lang.NullPointerException
at
org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:967)
at org.drools.reteoo.AccumulateNode.splitList(AccumulateNode.java:920)
at
org.drools.reteoo.AccumulateNode.removePreviousMatchesForLeftTuple(Accumulat
eNode.java:874)
at
org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:205)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(
CompositeLeftTupleSinkAdapter.java:238)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTupleDes
troyRightTuple(CompositeLeftTupleSinkAdapter.java:138)
at
org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:212)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(
CompositeLeftTupleSinkAdapter.java:238)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTuple(Co
mpositeLeftTupleSinkAdapter.java:122)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:163)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(Sin
gleLeftTupleSinkAdapter.java:217)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(Singl
eLeftTupleSinkAdapter.java:91)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:163)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(Sin
gleLeftTupleSinkAdapter.java:217)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTupleDestro
yRightTuple(SingleLeftTupleSinkAdapter.java:107)
at
org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:212)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(
CompositeLeftTupleSinkAdapter.java:238)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTuple(Co
mpositeLeftTupleSinkAdapter.java:122)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:163)
at
org.drools.reteoo.ModifyPreviousTuples.retractTuples(ModifyPreviousTuples.ja
va:111)
at
org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:176)
at
org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:14
42)
at
org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:13
49)
at
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:18
3)
at
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:19
6)
at
com.delegatecom.rules.drl.Rule_Iphone_dialog_sentence___QUERY_AVAILABILITY_0
.defaultConsequence(Rule_Iphone_dialog_sentence___QUERY_AVAILABILITY_0.java:
27)
at
com.delegatecom.rules.drl.Rule_Iphone_dialog_sentence___QUERY_AVAILABILITY_0
DefaultConsequenceInvoker.evaluate(Rule_Iphone_dialog_sentence___QUERY_AVAIL
ABILITY_0DefaultConsequenceInvoker.java:65)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917)
... 33 more
Any idea what this can be?
Regards,
Hezi
14 years, 10 months
FW: Drools in non-eclipse environment
by Abhay B. Chaware
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(a)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(a)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(a)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(a)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(a)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(a)lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org> [rules-users-bounces(a)lists.jboss.org<mailto:rules-users-bounces@lists.jboss.org>] On Behalf Of Wolfgang Laun [wolfgang.laun(a)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(a)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(a)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(a)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(a)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(a)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(a)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(a)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)
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org<mailto:rules-users@lists.jboss.org><mailto:rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org>>
> https://lists.jboss.org/mailman/listinfo/rules-users
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14 years, 10 months
Drools 5.2.0.M2 is not compatible with JDK 1.5?
by style.x7
Hi all,
I'm just trying out the default Drools project created with Eclipse plugin
but already getting errors:
java.lang.NoSuchMethodError:
java.util.LinkedList.peekLast()Ljava/lang/Object;
at
org.drools.rule.builder.dialect.java.parser.JavaParser.addBlockDescr(JavaParser.java:249)
at
org.drools.rule.builder.dialect.java.parser.JavaParser.updateStatement(JavaParser.java:6934)
at
org.drools.rule.builder.dialect.java.parser.JavaParser.statement(JavaParser.java:6117)
at
org.drools.rule.builder.dialect.java.parser.JavaParser.blockStatement(JavaParser.java:5733)
at
org.drools.rule.builder.dialect.java.parser.JavaParser.block(JavaParser.java:5662)
at
org.drools.rule.builder.dialect.java.JavaExprAnalyzer.analyzeBlock(JavaExprAnalyzer.java:92)
at
org.drools.rule.builder.dialect.java.JavaDialect.analyzeBlock(JavaDialect.java:258)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:90)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:98)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1546)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:653)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:295)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:471)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
...
peekLast() is a JDK 1.6 method.. so does that means from Drools 5.2x
onwards, I have to upgrade my JDK? Which sadly I can't cause my company is
using OSX Leopard, stuck with JDK 1.5 :(
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14 years, 10 months
RuleML 2011 @ BRF Paper Deadline June 21st
by Adrian Paschke
CALL FOR PAPERS
RuleML2011 at BRF
5th International Symposium on Linked Rules: Research-Based,
Industry-Focused
Westin Diplomat, Ft. Lauderdale, Florida, 3-5 November 2011
http://2011.ruleml.org/america
FIRM Extended DEADLINE for paper submission: June 21
Following many requests for an extension of the RuleML at BRF deadline, the
Program committee has decided that 21st June 2011, will be the latest date
on which full papers can be submitted: Note that this deadline cannot be
further extended, since the PC needs to have the time for a good review
process.
Prior submission of abstracts is no longer required.
About RuleML 2011 at BRF
---------------------
In 2011, two installments of the RuleML Symposium will take place. The first
one will be held in conjunction with IJCAI 2011 in Barcelona, Spain, in
July.
The second one will be co-located with the Business Rule Forum to be held in
early November in Ft. Lauderdale, Florida, USA. The second instalment will
include the RuleML Challenge Award which, this year, is dedicated to Rules
and Ontologies.
Objectives
----------
RuleML-2011 at BRF is a research-based, industry-focused symposium:
its main goal is to build a bridge between academia and industry in
the field of rules and semantic technology, and so to stimulate
the cooperation and interoperability between business and research,
by bringing together rule system providers,
participants in rule standardization efforts, open source communities,
practitioners, and researchers. The concept of the symposium has also
advanced continuously in the face of extremely rapid progress in
practical rule and event processing technologies. As a result,
RuleML-2011 will feature hands-on demonstrations and challenges
alongside a wide range of thematic tracks. It will thus be an exciting
venue to exchange new ideas and share experiences
on all issues related to the engineering, management, integration,
interoperation, and interchange of rules in distributed enterprise
intranets and open environments alike.
Topics
--------
As in the previous years, the Symposium will be organized in tracks:
specifically, the RuleML-2011 at BRF focus will be on the following areas:
*** Rules, Semantic Technology, and Cross-Industry Standards
*** Rules and Automated Reasoning
*** Rule-Based Distributed/Multi-Agent Systems
*** Rule Transformation and Extraction
*** Vocabularies, Ontologies, and Business rules
*** NIEM and Rules
*** Cloud Computing and Rules
*** Clinical Semantic and Rules
*** Fuzzy Rules and Uncertainty
*** Rules and Norms
*** Rule-Based Policies, Reputation and Trust
*** Rule-based Event Processing and Reaction Rules
*** General Topics
Submissions on general rule topics are welcome, such as:
- Progress in rule language specification (in XML Schema, Relax NG, etc.)
- Implemented tools for rule bases (e.g. XML and RDF rule validators)
- Rule interchange and reasoning
- Execution models, rule engines, and development environments
- Graphical processing, modeling and rendering of rules
- Rules and NLP
- Rule-based applications
- Usability and effectiveness of rule-based systems and languages
Case studies, experience reports, and industrial problem statements are
particularly encouraged.
RuleML-2011 Challenge
---------------------
The RuleML-2011 Challenge is one of the highlights of RuleML-2011.
Prizes will be awarded to the two best applications, one for the
focus theme and one for the other categories.
This year, the Challenge will be focused on the theme:
***Combining Rules, Objects, and Ontologies: Implementations and
Applications***
The call for demos is available on:
http://2011.ruleml.org/america/challenge
Submission Guidelines
---------------------
Authors are invited to submit original contributions of practical relevance
and technical rigor in the field, experience reports and show case/use case
demonstrations of effective, practical, deployable rule-based technologies
or
applications in distributed environments. Papers must be in English and may
be submitted at
https://www.easychair.org/conferences/?conf=ruleml2011brf
Please upload all submissions as PDF files in LNCS format
(http://www.springer.de/comp/lncs/authors.html).
The selected papers will be published in book form in the Springer Lecture
Notes in Computer Science (LNCS) series.
The selected demo papers will be published in CEUR proceedings.
Important Dates
---------------
Paper submission: June 21, 2011 (11:59PM, UTC-12)
Notification to authors: July 18, 2011
Camera-ready copy due: August 8, 2011
RuleML-2010 Challenge Demos submission: Sept. 2, 2011
RuleML-2011 dates: Nov 3-5, 2011
14 years, 10 months
Why is Drools called "Drools"?
by John Peterson
This is something I get asked on a semi-regular basis and I don't have a good answer for it, so I thought I'd post it to the mailing list and hope someone can tell the story. Is there anyone out there who can explain how the name "Drools" was settled on?
14 years, 10 months
Using multiple Collect() From result in null pointer exception
by Hezi Stern
I have encountered the following issue when running a rule that has more
than 1 collect from a same collection.
I have the following two rules:
rule "filter sentences based on existence of attributes"
when
IPhoneQueryCmd(State.POPULATE == state,
$tidt: targetId)
$attributeFilteredSentences: ArrayList()
from collect (IPhoneSentences.Sentence(
( (descriptor.targetPrivatename == false) || (descriptor.targetPrivatename
== $cmt.sentenceFilters.targetPrivatename) ) &&
( (descriptor.targetSurename == false) || (descriptor.targetSurename ==
$cmt.sentenceFilters.targetSurename) ) &&
( (descriptor.targetFullname == false) || (descriptor.targetFullname ==
$cmt.sentenceFilters.targetFullname) ) &&
( (descriptor.requesterPrivatename == false) ||
(descriptor.requesterPrivatename ==
$cmt.sentenceFilters.requesterPrivatename) ) &&
( (descriptor.requesterSurename == false) || (descriptor.requesterSurename
== $cmt.sentenceFilters.requesterSurenamename) ) &&
( (descriptor.requesterFullname == false) || (descriptor.requesterFullname
== $cmt.sentenceFilters.requesterFullname) ) &&
( (descriptor.time == false) || (descriptor.time ==
$cmt.sentenceFilters.time) ) &&
( (descriptor.subject == false) || (descriptor.subject == $cmt.subject) )
))
then
end
rule "Iphone targets information update - QUERY_AVAILABILITY" extends
"filter sentences based on existence of attributes"
when
$qc: IPhoneQueryCmd(State.POPULATE == state, $tid:
targetId)
$cm: ConditionMatrix($taskId: taskId,
targetId ==
$tid,
contextIntention
== EContextIntention.QUERY_AVAILABILITY,
$timeConstraintType: requesterConstraint.constraintRequestType)
$targetResponse: ArrayList()
from collect
(IPhoneSentences.Sentence(descriptor.intentions.intention contains
EContextIntention.QUERY_AVAILABILITY.name)
from $attributeFilteredSentences)
then
//do something
End
This works fine but once I wish to add a second filtered ArrayList using
$attributeFilteredSentences I get a null pointer exception.
For example I will add an exact similar filter condition but change the
result var name (I called it $dummyVar)
rule "Iphone targets information update - QUERY_AVAILABILITY" extends
"filter sentences based on existence of attributes"
when
$qc: IPhoneQueryCmd(State.POPULATE == state, $tid:
targetId)
$cm: ConditionMatrix($taskId: taskId,
targetId ==
$tid,
contextIntention
== EContextIntention.QUERY_AVAILABILITY,
$timeConstraintType: requesterConstraint.constraintRequestType)
$targetResponse: ArrayList()
from collect
(IPhoneSentences.Sentence(descriptor.intentions.intention contains
EContextIntention.QUERY_AVAILABILITY.name)
from $attributeFilteredSentences)
$dummyVar: ArrayList()
from collect
(IPhoneSentences.Sentence(descriptor.intentions.intention contains
EContextIntention.QUERY_AVAILABILITY.name)
from $attributeFilteredSentences)
then
//do something
End
In this case I get the following exception stack:
org.drools.runtime.rule.ConsequenceException: rule: Iphone dialog sentence -
QUERY_AVAILABILITY
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleExcept
ion(DefaultConsequenceExceptionHandler.java:39)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:927)
at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856)
at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:785)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:751)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeS
essionImpl.java:218)
at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSess
ionImpl.java:302)
at
com.delegatecom.task.TaskStatelessSession.testRunRules(TaskStatelessSession.
java:122)
at
com.delegatecom.task.TaskStatelessSession.internalTestNextStep(TaskStateless
Session.java:98)
at
com.delegatecom.task.TaskStatelessSession.testNextStep(TaskStatelessSession.
java:76)
at com.delegatecom.test.AtoB.testStatelessRule(AtoB.java:99)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.
java:44)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.j
ava:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.ja
va:41)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.jav
a:20)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.jav
a:76)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.jav
a:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28
)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestRef
erence.java:46)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:3
8)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu
nner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu
nner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.
java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner
.java:197)
Caused by: java.lang.NullPointerException
at
org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:967)
at org.drools.reteoo.AccumulateNode.splitList(AccumulateNode.java:920)
at
org.drools.reteoo.AccumulateNode.removePreviousMatchesForLeftTuple(Accumulat
eNode.java:874)
at
org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:205)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(
CompositeLeftTupleSinkAdapter.java:238)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTupleDes
troyRightTuple(CompositeLeftTupleSinkAdapter.java:138)
at
org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:212)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(
CompositeLeftTupleSinkAdapter.java:238)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTuple(Co
mpositeLeftTupleSinkAdapter.java:122)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:163)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(Sin
gleLeftTupleSinkAdapter.java:217)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(Singl
eLeftTupleSinkAdapter.java:91)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:163)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(Sin
gleLeftTupleSinkAdapter.java:217)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTupleDestro
yRightTuple(SingleLeftTupleSinkAdapter.java:107)
at
org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:212)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(
CompositeLeftTupleSinkAdapter.java:238)
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTuple(Co
mpositeLeftTupleSinkAdapter.java:122)
at org.drools.reteoo.JoinNode.retractLeftTuple(JoinNode.java:163)
at
org.drools.reteoo.ModifyPreviousTuples.retractTuples(ModifyPreviousTuples.ja
va:111)
at
org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:176)
at
org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:14
42)
at
org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:13
49)
at
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:18
3)
at
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:19
6)
at
com.delegatecom.rules.drl.Rule_Iphone_dialog_sentence___QUERY_AVAILABILITY_0
.defaultConsequence(Rule_Iphone_dialog_sentence___QUERY_AVAILABILITY_0.java:
27)
at
com.delegatecom.rules.drl.Rule_Iphone_dialog_sentence___QUERY_AVAILABILITY_0
DefaultConsequenceInvoker.evaluate(Rule_Iphone_dialog_sentence___QUERY_AVAIL
ABILITY_0DefaultConsequenceInvoker.java:65)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917)
... 33 more
Any idea what this can be?
Regards,
Hezi
14 years, 10 months
ERR 101 & 102 When parsing Decision Table xls
by Sleepyhead
Hey all,
I'm new to Drools, and trying to use decision tables.
Only I got some errors I don't understand
Description Resource Path Location Type
[ERR 101] Line 15:87 no viable alternative at input 'false' in rule "Pricing
bracket_11" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 15 Drools Error
[ERR 101] Line 23:115 no viable alternative at input 'false' in rule
"Pricing bracket_12" in pattern Person CheckAccepted.xls
/DroolzBeslis/src/main/rules line 23 Drools Error
[ERR 101] Line 31:123 no viable alternative at input 'true' in rule "Pricing
bracket_13" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 31 Drools Error
[ERR 101] Line 7:58 no viable alternative at input 'false' in rule "Pricing
bracket_10" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 7 Drools Error
[ERR 102] Line 15:93 mismatched input ';' expecting ')' in rule "Pricing
bracket_11" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 15 Drools Error
[ERR 102] Line 15:94 mismatched input ',' expecting 'then' in rule "Pricing
bracket_11" CheckAccepted.xls /DroolzBeslis/src/main/rules line 15 Drools
Error
[ERR 102] Line 23:121 mismatched input ';' expecting ')' in rule "Pricing
bracket_12" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 23 Drools Error
[ERR 102] Line 23:122 mismatched input ',' expecting 'then' in rule "Pricing
bracket_12" CheckAccepted.xls /DroolzBeslis/src/main/rules line 23 Drools
Error
[ERR 102] Line 31:128 mismatched input ';' expecting ')' in rule "Pricing
bracket_13" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 31 Drools Error
[ERR 102] Line 31:129 mismatched input ',' expecting 'then' in rule "Pricing
bracket_13" CheckAccepted.xls /DroolzBeslis/src/main/rules line 31 Drools
Error
[ERR 102] Line 7:64 mismatched input ';' expecting ')' in rule "Pricing
bracket_10" in pattern Person CheckAccepted.xls /DroolzBeslis/src/main/rules
line 7 Drools Error
[ERR 102] Line 7:65 mismatched input ',' expecting 'then' in rule "Pricing
bracket_10" CheckAccepted.xls /DroolzBeslis/src/main/rules line 7 Drools
Error
Unknown error while parsing. This is a bug. Please contact the Development
team. CheckAccepted.xls /DroolzBeslis/src/main/rules Unknown Drools Error
I also attached the XLS, someone any idea?
http://drools.46999.n3.nabble.com/file/n3048185/CheckAccepted.xls
CheckAccepted.xls
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14 years, 10 months
Custom-Operator - No access to FactHandles?
by Martin, Matthias
Hello,
some of our custom operators need to access already inserted facts at runtime. Therefore we extended org.drools.base.BaseEvaluator. The provide methods, i. e.
public boolean evaluate(InternalWorkingMemory workingMemory, InternalReadAccessor extractor, Object object, FieldValue value), state, amongst others, a parameter "workingMemory" of type org.drools.common.InternalWorkingMemory.
When calling workingMemory.getObjects() we receive a "UnsupportedOperationException". The question is whether it is possible to access facts in a KnwoledgeSession at runtime or not. Alternatively we could provide the objects in question as globals and call workingMemory.getGlobal(), but that seems to me like somewhat bad architecture.
Any suggestions are welcome.
Many thanks,
-Matthias
14 years, 10 months
