[rules-users] fireAllRules fire an exception !
Hi, I try to execute this code : session.startProcess(ruleFlowId); session.insert(fact); session.fireAllRules(); But I have a NullPointerEception : java.lang.NullPointerException at mipih.Rule_Correction_acte_0.consequence(Rule_Correction_acte_0.java:15) at mipih.Rule_Correction_acte_0ConsequenceInvoker.evaluate(Rule_Correction_acte_0ConsequenceInvoker.java:23) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:545) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:509) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:430) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:392) Any help pls -- View this message in context: http://www.nabble.com/fireAllRules-fire-an-exception-%21-tf4169266.html#a11861345 Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Bug: Shadow facts
Hi,
I have an Object 'Configuration'
public class BooleanConfiguration {
String paramName;
Boolean value;
Client client;
}
I asserted this object and the rule was not executing as I expected.
I put a break point in the object, and found that it set it correctly but
whenenver the rule engine called the get method the vaue of the object was null.
I traced this the place where it creates shadows in Rete.java.
I had observed a similar behaviour in version 3.1 or 3.6 (if there was a 3.6).
it was more prolific then. I have over 50 objects, only this one is giving a
problem.
I made the class 'final' (This prevents a shadow from being created), and voila
my rule worked as expected.
Note: None of the otehr objects needed a final, but had comeplex associations.
But this particular object does not run, unless declared final.
The fact that i have to use 'final' for it to work, seals it for me as a bug.
thanks,
Arjun
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Re: [rules-users] Does the Rete Graph recognize associations independently?
The engine has no way to know that one object is a field of another
object. For this reason you should setup things relationally, using an
object to relate the parent and child. Look at the Conways game of life
example and the Neighbor class. You also then have the advantage that
you can now exploit the cross product to drive the application.
Read this blog:
http://blog.athico.com/2007/06/declarative-relational-programming.html
Mark
Arjun Dhar wrote:
Hi,
one doubt I've had while writing DRL scripts and also with others is:
A {
B b
C c
D d
};
If The rules are to be Written over A, B, C
Then should one assert B, C D also? --- Answer yes!
Ok, now that we've asserted them, in the Rule if one uses:
A.b; does the Rete graph recognize it as a node of A or B?
I suspect it is 'A'
Hence...
I take a safe approach and write rules on B,C independently but then ensure
those objects are reverse associated with A. This increases the risk of objects
not being released for GC (depends on JVM) if not nullified (and breaking the
circular associations).
So whats the best approach in designing objects for the Engine?
Thanks,
Arjun
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Re: [rules-users] fireAllRules fire an exception !
Just means your consequence threw a NullPointerException, the expception should contain an nested exception with some more information. Mark hypnosat7 wrote: Hi, I try to execute this code : session.startProcess(ruleFlowId); session.insert(fact); session.fireAllRules(); But I have a NullPointerEception : java.lang.NullPointerException at mipih.Rule_Correction_acte_0.consequence(Rule_Correction_acte_0.java:15) at mipih.Rule_Correction_acte_0ConsequenceInvoker.evaluate(Rule_Correction_acte_0ConsequenceInvoker.java:23) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:545) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:509) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:430) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:392) Any help pls ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Bug: Shadow facts
Arjun,
Can you please open a JIRA and add a self contained test case showing the
problem?
Thank you,
Edson
2007/7/30, Arjun Dhar [EMAIL PROTECTED]:
Hi,
I have an Object 'Configuration'
public class BooleanConfiguration {
String paramName;
Boolean value;
Client client;
}
I asserted this object and the rule was not executing as I expected.
I put a break point in the object, and found that it set it correctly but
whenenver the rule engine called the get method the vaue of the object was
null.
I traced this the place where it creates shadows in Rete.java.
I had observed a similar behaviour in version 3.1 or 3.6 (if there was a
3.6).
it was more prolific then. I have over 50 objects, only this one is giving
a
problem.
I made the class 'final' (This prevents a shadow from being created), and
voila
my rule worked as expected.
Note: None of the otehr objects needed a final, but had comeplex
associations.
But this particular object does not run, unless declared final.
The fact that i have to use 'final' for it to work, seals it for me as a
bug.
thanks,
Arjun
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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[rules-users] class Cast Exception when using OR (||) - Bug?
When I define a rule: When cntct:Contact (initialized==true) exr:Relation( contact==cntct, active:active==$1, relationName==Old) Then contact.getStatus().setStatus(true); contact.getStatus().addToReasonTrace(drools.getRule().getName()); end ..The bove works. BUT, when I do the following: When cntct:Contact (initialized==true) exr:Relation( contact==cntct, active:active==$1, relationName==Old) || Relation( contact==cntct, active:active==$1, relationName==null) Then contact.getStatus().setStatus(true); contact.getStatus().addToReasonTrace(drools.getRule().getName()); end ... The script compiles anda stateless Session is created successfully, but at runtime/execution it fails with the exception: java.lang.ClassCastException: com.arjun.brms.businessObjects.Contact org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:75) org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:141) org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple (SingleTupleSinkAdapter.java:20) org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:120) org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple (SingleTupleSinkAdapter.java:20) org.drools.reteoo.JoinNode.assertObject(JoinNode.java:162) org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java:317) org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130) org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java:308) org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130) org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java:308) org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168) org.drools.reteoo.Rete.assertObject(Rete.java:168) org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190) org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:848) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:822) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:623) Class diagram: Contact-- bi-directional association --ListRelation Please advise! is this a bug? thanks, Arjun ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Re: class Cast Exception when using OR (||) - Bug?
FYI Let $1 = true and the object Contact is declared 'final' thanks, Arjun ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Production rules vs. ECA Rules
Dear List, In JBoss Rules documentation it is written that they can be used for production rules. But I frequently read also in other sources about ECA rules. Is there any significant difference between “ECA” and “Production” Rules? If yes, what? Thanks in advance for your feedback and best Regards, Kioumars -- GMX FreeMail: 1 GB Postfach, 5 E-Mail-Adressen, 10 Free SMS. Alle Infos und kostenlose Anmeldung: http://www.gmx.net/de/go/freemail ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] class Cast Exception when using OR (||) - Bug?
Arjun It is a bug since a more friendly message should be raised at compile time stating that your contact declaration is not available in one of your logical branches. Having said that, what you want to do is make your OR take priority over the implicit AND and as such, you need to add () around the OR: When contact:Contact (initialized==true) exr: ( Relation( contact==cntct, active:active==$1, relationName==Old) or Relation( contact==cntct, active:active==$1, relationName==null) ) Then contact.getStatus().setStatus(true); contact.getStatus().addToReasonTrace(drools.getRule().getName()); end Having said that, better yet for you would not to use the OR CE, but to use restriction connectives. This would be the most efficient (and clean) way of writing your rule: When contact:Contact (initialized==true) exr: Relation( contact==cntct, active:active==$1, relationName ==Old || == null ) Then contact.getStatus().setStatus(true); contact.getStatus().addToReasonTrace(drools.getRule().getName()); end As a syntax sugar, you could also write: exr: Relation( contact==cntct, active:active==$1, relationName in ( Old, null ) ) Can you please open a JIRA with your test case for the bug? Thank you, Edson 2007/7/30, Arjun Dhar [EMAIL PROTECTED]: When I define a rule: When cntct:Contact (initialized==true) exr:Relation( contact==cntct, active:active==$1, relationName==Old) Then contact.getStatus().setStatus(true); contact.getStatus().addToReasonTrace(drools.getRule().getName()); end ..The bove works. BUT, when I do the following: When cntct:Contact (initialized==true) exr:Relation( contact==cntct, active:active==$1, relationName==Old) || Relation( contact==cntct, active:active==$1, relationName==null) Then contact.getStatus().setStatus(true); contact.getStatus().addToReasonTrace(drools.getRule().getName()); end ... The script compiles anda stateless Session is created successfully, but at runtime/execution it fails with the exception: java.lang.ClassCastException: com.arjun.brms.businessObjects.Contact org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:75) org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java :141) org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple (SingleTupleSinkAdapter.java:20) org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:120) org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple (SingleTupleSinkAdapter.java:20) org.drools.reteoo.JoinNode.assertObject(JoinNode.java:162) org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java:317) org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130) org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java:308) org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130) org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java:308) org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168) org.drools.reteoo.Rete.assertObject(Rete.java:168) org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190) org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java :70) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java :848) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java :822) org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java :623) Class diagram: Contact-- bi-directional association --ListRelation Please advise! is this a bug? thanks, Arjun ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] drools-example-brms
Hi Shahad, You are right, the binary in resources directory is deprecated, But as you can see I'm using the RuleAgent url to access deployed stuff (http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-examples/ drools-examples-brms/src/main/brmsdeployedrules.properties ), I think for compatibility issues will be better remove the compiled package in resources dir. Thanks for your feedback Fernando Meyer http://fmeyer.org [EMAIL PROTECTED] PGP: 0xD804DDFB On Jul 30, 2007, at 1:26 PM, Shahad Ahmed wrote: I had the same problem but managed to fix it. I think the problem is that the repository in the BRMS insurance example was built with an old version of the MVEL library (mvel14-1.2pre5.jar) which means that some the MVEL objects defined in the example repository (in file repository_export.xml) have an incorrect serialVersionUID values when they are accessed by the BRMS web-app, which uses a (newer?) version of MVEL mvel14-1.2rc1.jar. Here's how I got the example working: 1. I assume you've already loaded the example repository from repository_export.xml as described in Fernando's instructions for the BRMS example in the drools 4.0GA manual (section 9, which incidentally doesn't have a table of contents entry, so you have to scroll down to near the end of the manual). Click the Packages option on the left-hand side of the BRMS page. Select the org.acme.insurance package in the Explore tab. Click on build, validate and deploy for this package. Then click the Build Package button. This will build a new version of the example, but using the new MVEL library. If the build worked, another button will appear below the Build Package button called create Snapshot for Deployment. Created a new snapshot and call it what you like. 2. Click the Deployment option on the left-hand-side of the BRMS window. Click on the Snapshot tab and then select the org.acme.insurance package. The new snapshot you created should be listed. Click the Open button beside it and copy the displayed Package URI into the brmsdeployedrules.properties file to replace the existing key called url – this is identical to the instructions in the manual. Save the file. 3. In the example eclipse project, remove the mvel14-1.2pre5.jar from the project's java build path libraries. Add in the following jars from the drools 4.0 GA binary distribution: mvel14-1.2rc1.jar drools-core-4.0.0.jar drools-compiler-4.0.0.jar Now run MainClass in the examples eclipse project. Hopefully, you will see the expected output. Note that the exported binary version of the insurance example found in resources/org.acme.insurance.pkg suffers from the same issue. To get that working as well you will need to create a new version of the file by selecting download binary package in step 1, after clicking Build Package. Also note that you get the same problem if you use the BRMS Drools 4.0.0 BRMS Standalone version that comes with Tomcat 5.5 on the download page. To fix that, find the folder drools-jbrms-1.0- standalone\shared\lib and then replace mvel14-1.0-SNAPSHOT.jar with the version of MVEL in the 4.0 GA binary dist - mvel14-1.2rc1.jar. Hope this helps. Shahad On 7/20/07, davidnm [EMAIL PROTECTED] wrote: I did it and i got the same, i forgot to say i´m running it on Tomcat 5.5 could it be the problem? Thanks. Fernando Meyer Camargo wrote: use double \ in your config. file ex. D:\\workspace2\\drools-example-brms\\cache Fernando Meyer http://fmeyer.org [EMAIL PROTECTED] PGP: 0xD804DDFB On Jul 19, 2007, at 9:31 AM, David Nogueras wrote: Hi, I´m trying to run the brms sample and i get the next output: RuleAgent(insuranceconfig) INFO (Thu Jul 19 14:27:44 CEST 2007): Configuring with newInstance=true, secondsToRefresh=30 RuleAgent(insuranceconfig) INFO (Thu Jul 19 14:27:44 CEST 2007): Configuring package provider : URLScanner monitoring URLs: http:// localhost:8080/drools-jbrms/org.drools.brms.JBRMS/package/ org.acme.insurance/David2 with local cache dir of D:\workspace2 \drools-example-brms\cache RuleAgent(insuranceconfig) WARNING (Thu Jul 19 14:27:44 CEST 2007): Falling back to local cache. java.lang.NullPointerException at org.drools.agent.FileScanner.readPackage(FileScanner.java: 101) at org.drools.agent.FileScanner.getChangeSet (FileScanner.java:79) at org.drools.agent.FileScanner.loadPackageChanges ( FileScanner.java:57) at org.drools.agent.URLScanner.loadPackageChanges (URLScanner.java:93) at org.drools.agent.RuleAgent.checkForChanges (RuleAgent.java:291) at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java: 259) at org.drools.agent.RuleAgent.configure(RuleAgent.java:228) at org.drools.agent.RuleAgent.init(RuleAgent.java:160) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:169) at org.acme.insurance.launcher.InsuranceBusiness.loadRuleBase
Re: [rules-users] Production rules vs. ECA Rules
ECA is really a specialised subset of Product Rules; focusing more on generic event generation and event handling. Mark [EMAIL PROTECTED] wrote: Dear List, In JBoss Rules documentation it is written that they can be used for production rules. But I frequently read also in other sources about ECA rules. Is there any significant difference between “ECA” and “Production” Rules? If yes, what? Thanks in advance for your feedback and best Regards, Kioumars ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] JBoss Drools BRMS Standalone
Now you can download BRMS standalone version, this distribution comes with a built-in Tomcat 5.5.20 web server and the insurance example as demo repository, so it runs out the box. If you want to test BRMS and don't have enough time to deploy, just follow to downloads page http://labs.jboss.com/drools/downloads Brief install guide 1. Install a Java Development Kit (JDK) from http://java.sun.com/ javase/downloads/index.jsp (avoid JREs, Java EEs, Netbeans, etc. on that page - you just want a JDK). 2. Set the JAVA_HOME variable to where you installed Java. Windows installers may do this for you. 3. Run bin/startup.sh (*nix) or bin\startup.bat (Windows). Check that there are no errors on the console. See below for troubleshooting advice. 4. Point your browser at http://localhost/ You should see brms's login box. Problem A common startup problem is when another program has claimed port 80, which BRMS is configured to run on by default. To avoid this port conflict, BRMS's port can be changed in conf/server.xml. If you have installation (or other) problems, ask on the mailing lists or irc. http://labs.jboss.com/drools/irc.html Fernando Meyer http://fmeyer.org [EMAIL PROTECTED] PGP: 0xD804DDFB ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
