[rules-users] Dynamic rule loading
Fnu Mahalakshmi
FMahalakshmi at nyx.com
Wed Jun 16 08:33:48 EDT 2010
Hi,
Yes I added the drools-compiler as a dependency.
I have added all the required jars to my classpath.
Any other error???
Thanks
M
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Today's Topics:
1. Re: Dynamic Rule Loading (Esteban Aliverti)
2. Re: rule error (Esteban Aliverti)
----------------------------------------------------------------------
Message: 1
Date: Wed, 16 Jun 2010 09:21:13 -0300
From: Esteban Aliverti <esteban.aliverti at gmail.com>
Subject: Re: [rules-users] Dynamic Rule Loading
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID:
<AANLkTil7CJpWIhO_eodIWM7vpgIS8NDzPyAP2Hx67JqO at mail.gmail.com>
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Are you including drools-compiler as a dependency?
On Tue, Jun 15, 2010 at 5:28 PM, Fnu Mahalakshmi <FMahalakshmi at nyx.com>wrote:
> Hi,
>
> I was trying to use knowledge builder package for dynamic loading of the
> rule files. Getting major errors.
>
> My knowledge builder basically adds the rule resources from the
> change-set.xml file which I have in my project directory.
>
> I am using the knowledge agent and knowledge base to add all the packages
> loaded from my change-set xml file.
>
> Am I wrong somewhere???
>
> My code is as follows:
>
>
> private KnowledgeBase loadRules(String[] rules) throws Exception{
>
> KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
> kbuilder.add( ResourceFactory.newClassPathResource(
> "/change-set.xml", getClass() ),
> ResourceType.CHANGE_SET );
> if ( kbuilder.hasErrors() ) {
> System.err.println( kbuilder.getErrors().toString() );
> }
> KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent(
> "MyAgent" );
> kagent.applyChangeSet(
> ResourceFactory.newClassPathResource("/change-set.xml", getClass()));
> KnowledgeBase kbase = kagent.getKnowledgeBase();
> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
>
> return kbase;
> }
>
> my change-set.xml is as follows:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <change-set xmlns='http://drools.org/drools-5.0/change-set'
> xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
> xs:schemaLocation='drools-change-set-5.0.xsd' >
> <add>
> <resource source='src/main/rules/' type='DRL' />
> </add>
> </change-set>
>
> I am getting the following error stack when I run:
>
> Exception in thread "main" org.drools.ProviderInitializationException:
> Provider org.drools.builder.impl.KnowledgeBuilderProviderImpl could not be
> set.
> at
> org.drools.builder.KnowledgeBuilderFactory.loadProvider(KnowledgeBuilderFactory.java:111)
> at
> org.drools.builder.KnowledgeBuilderFactory.getKnowledgeBuilderProvider(KnowledgeBuilderFactory.java:101)
> at
> org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:29)
> at com.org.RuleRunner.loadRules(RuleRunner.java:58)
> at com.org.RuleRunner.runStatelessRules(RuleRunner.java:127)
> at com.org.RulesTest.main(RulesTest.java:40)
> Caused by: java.lang.ClassNotFoundException:
> org.drools.builder.impl.KnowledgeBuilderProviderImpl
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClassInternal(Unknown Source)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Unknown Source)
> at
> org.drools.builder.KnowledgeBuilderFactory.loadProvider(KnowledgeBuilderFactory.java:108)
> ... 5 more
>
>
> The error comes exactly at the start where I call knowledge builder.
> Please help!!
>
> Thanks
> M
>
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--
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
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Message: 2
Date: Wed, 16 Jun 2010 09:24:05 -0300
From: Esteban Aliverti <esteban.aliverti at gmail.com>
Subject: Re: [rules-users] rule error
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID:
<AANLkTin7WWH2t8YETZvExSa9bGHwh7lqBvUYZgRobVIW at mail.gmail.com>
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I recommend you to read the manual first.
2010/6/16 Giovanni Motta <mottagio at gmail.com>
> You have 2 options here:
> status == ?yes" *||* status == "no"
> status == ?yes" *||* == "no"
>
> 'or' connector is not applied on constraints, but on patterns.
>
> Regards
>
> 2010/6/16 Fnu Mahalakshmi <FMahalakshmi at nyx.com>
>
>> Hi,
>>
>>
>>
>> I want to just depict ?&&? and ?or? in my rules and did as follows:
>>
>>
>>
>> *rule* "Update value?
>>
>> *no-loop* *true*
>>
>> *when*
>>
>> $y :Y(name != "")
>>
>> $x: X(status != "")
>>
>> $z : Z( y == $y, x == $X,(status == ?yes" *or* status == "no"
>> ))
>>
>> *then*
>>
>> *modify*($z){};
>>
>>
>>
>> end
>>
>>
>>
>> The above does not work. Is it not valid to write as above??
>>
>> How else can I depict ?or? ? relation?
>>
>> *rule* "Update value"
>>
>> *no-loop* *true*
>>
>> *when*
>>
>> $y :Y(name != "")
>>
>> $x: X(status != "")
>>
>> $z : Z( y == $y, x == $X,(status == ?yes" *, *status == "no"
>> ))
>>
>> *then*
>>
>> *modify*($z){
>>
>> setOutput($z)};
>>
>>
>>
>> end
>>
>>
>>
>>
>>
>> even this does not work.
>>
>>
>>
>> I also want to add all the values specific to this condition and just
>> print them out in my output file.
>>
>> So I tried adding it to a list (which is done by setOutput().
>>
>> But here I keep getting multiple entries for the same value.
>>
>> For eg. {a,b,c } //are instances of type z
>>
>> They keep getting added again and again. Should it not process input only
>> once????
>>
>>
>>
>>
>>
>> Please help.
>>
>>
>>
>> Thank you
>>
>> m
>>
>> ------------------------------
>>
>> *Please consider the environment before printing this email.*
>>
>> *Visit our website at http://www.nyse.com
>> *****************************************************************************
>>
>> Note: The information contained in this message and any attachment to it
>> is privileged, confidential and protected from disclosure. If the reader of
>> this message is not the intended recipient, or an employee or agent
>> responsible for delivering this message to the intended recipient, you are
>> hereby notified that any dissemination, distribution or copying of this
>> communication is strictly prohibited. If you have received this
>> communication in error, please notify the sender immediately by replying to
>> the message, and please delete it from your system. Thank you. NYSE
>> Euronext. *
>>
>>
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>>
>
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>
>
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
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