[rules-users] Dynamic Rule Loading

[Esteban Aliverti]

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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Esteban Aliverti
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