[rules-users] KnowledgeAgent doesn't load dsl files and dslr file from a change-set correctly

[Steve Ronderos]

Pritham,

I've experienced this issue before as well.  It has to do with the way 
that the KnowledgeAgent subscribes to resources.  I believe behind the 
scenes the resources are loaded in an arbitrary order.  There is a JIRA 
bug report already filed:

https://jira.jboss.org/jira/browse/JBRULES-2377

Hope this helps,

Steve

rules-users-bounces at lists.jboss.org wrote on 01/26/2010 01:07:29 PM:

> [image removed] 
> 
> [rules-users] KnowledgeAgent doesn't load dsl files and dslr file 
> from a change-set correctly
> 
> Pritham 
> 
> to:
> 
> rules-users
> 
> 01/26/2010 01:10 PM
> 
> Sent by:
> 
> rules-users-bounces at lists.jboss.org
> 
> Please respond to Rules Users List
> 
> 
> I have a folder in classpath:
> 
> dsl/global.dsl
> rules/section-A.dslr
> rules/section-A/page-1.dslr
> 
> I create a knowledge base like this:
> 
> public KnowledgeBase createKnowledgeBase() throws DroolsParserException,
> IOException {
> 
>     KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory
>             .newKnowledgeBuilder();
> 
>         knowledgeBuilder.add(ResourceFactory
>                 .newClassPathResource("dsl/global.dsl"),
>                 ResourceType.DSL);
>         knowledgeBuilder.add(ResourceFactory
>                 .newClassPathResource("rules/section-A.dslr"),
>                 ResourceType.DSLR);
>         knowledgeBuilder.add(ResourceFactory
>                 .newClassPathResource("rules/section-A/page-1.dslr"),
>                 ResourceType.DSLR); 
> 
>     if (knowledgeBuilder.hasErrors()) {
>         throw new 
RuntimeException(knowledgeBuilder.getErrors().toString());
>     }
> 
>     KnowledgeBase knowledgeBase = 
KnowledgeBaseFactory.newKnowledgeBase();
> 
> 
knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages());
> 
>     return knowledgeBase;
> }
> 
> // code
> knowledgeBase = createKnowledgeBase();
> session = knowledgeBase.newStatefulKnowledgeSession();
> // insert facts
> session.fireAllRules();
> session.dispose(); 
> 
> The above code works and I can get a unit test to work that processes 
rules
> accordingly. I can see my dslr converting to a drl using the "drl 
viewer"
> correctly (provided I temporarily place the dsl file in the same 
location
> since expander doesn't accept a relative path).
> 
> The problem, however is when I use a change-set.xml and a 
KnowledgeAgent,
> things don't work 
> 
> code for loading via knowledgeAgent
> 
> public static KnowledgeBase loadKnowledgeBase() throws
> DroolsParserException, IOException {
>     agent = KnowledgeAgentFactory.newKnowledgeAgent("msll agent");
> 
> 
agent.applyChangeSet(ResourceFactory.newClassPathResource("change-set.xml"));
> 
>     return agent.getKnowledgeBase();
> } 
> 
> 
> <change-set xmlns='http://drools.org/drools-5.0/change-set'
>              xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
> xs:schemaLocation='http://drools.org/drools-5.0/change-set.xsd'
> >
>    <add>
>        <resource source='classpath:dsl/' type='DSL' /> 
>        <resource source='classpath:rules/' type='DSLR' /> 
>        <resource source='classpath:rules/section-A/' type='DSLR' />
>     </add>
> </change-set>
> 
> 
> I get the following generic drools errors:
> ERR 103] Line 4:0 rule 'rule_key' failed predicate:
> {(validateIdentifierKey(DroolsSoftKeywords.RULE))}? in rule[7,0]: [ERR 
101]
> Line 7:0 no viable alternative at input 'import' in rule Con in rule
> attribute
> ...
> ...
> 
> The rules are same, folder location is the same. I believe that drools 
has a
> problem resolving path (expander global.dsl) from the dslr file when 
using a
> KnowlegeAgent since in the earlier strategy, one could build a dsl into 
the
> knowledgeBuilder directly from the classpath.
> 
> Pl suggest.
> -- 
> View this message in context: http://n3.nabble.com/KnowledgeAgent-
> doesn-t-load-dsl-files-and-dslr-file-from-a-change-set-correctly-
> tp139702p139702.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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