[rules-users] Dynamic Rule Loading

[Fnu Mahalakshmi]

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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