Unknown resource type: null when call kagent.applyChangeSet( resource ) the second time.

[devilkazuya99]

          URL url = new URL(CHANGE_SET_URL);
          UrlResource resource = (UrlResource) ResourceFactory.newUrlResource( url );
               
          KnowledgeAgentConfiguration agentConfig = KnowledgeAgentFactory.newKnowledgeAgentConfiguration(); 
             agentConfig.setProperty("drools.agent.newInstance", "true");
             agentConfig.setProperty("drools.agent.scanDirectories", "false");

               KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyKnowledgeAgent", agentConfig );
               
               KnowledgeAgentEventListener kaListener = new KnowledgeAgentEventListener() {
                    
                    @Override
                    public void resourceCompilationFailed(ResourceCompilationFailedEvent arg0) {
                         logger.debug("resourceCompilationFailed");
                    }
                    
                    @Override
                    public void knowledgeBaseUpdated(KnowledgeBaseUpdatedEvent arg0) {
                         logger.debug("knowledgeBaseUpdated");
                    }
                    
                    @Override
                    public void beforeResourceProcessed(BeforeResourceProcessedEvent arg0) {
                         logger.debug("beforeResourceProcessed");
                    }
                    
                    @Override
                    public void beforeChangeSetProcessed(BeforeChangeSetProcessedEvent arg0) {
                         logger.debug("beforeChangeSetProcessed");
                    }
                    
                    @Override
                    public void beforeChangeSetApplied(BeforeChangeSetAppliedEvent arg0) {
                         logger.debug("beforeChangeSetApplied");
                    }
                    
                    @Override
                    public void afterResourceProcessed(AfterResourceProcessedEvent arg0) {
                         logger.debug("afterResourceProcessed");
                    }
                    
                    @Override
                    public void afterChangeSetProcessed(AfterChangeSetProcessedEvent arg0) {
                         logger.debug("afterChangeSetProcessed");
                    }
                    
                    @Override
                    public void afterChangeSetApplied(AfterChangeSetAppliedEvent arg0) {
                         logger.debug("afterChangeSetApplied");
                    }
               };
               
               kagent.addEventListener(kaListener);
               
               kagent.applyChangeSet( resource );
               
               kagent.monitorResourceChangeEvents(true); 

The code above is ok but when I call

kagent.applyChangeSet( resource );

again then I get

Exception in thread "Thread-3" java.lang.RuntimeException: Unknown resource type: null
     at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:686)
     at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37)
     at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:712)
     at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1002)
     at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785)
     at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657)
     at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)
     at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169)
     at com.geneoz.procedureengine.KnowledgeAgentTest$ResourcePoller.run(KnowledgeAgentTest.java:68)
     at java.lang.Thread.run(Thread.java:680)

[eaa]

Can you share with us the change-set you are using?

Best Regards,

[devilkazuya99]

Here it is:

<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 http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd">
    <add>
        <resource source="http://192.168.10.13/drools/JavaInteractiveFlow.rf" type="DRF"/>
    </add>
</change-set>
     

Ad the rf file is:

<?xml version="1.0" encoding="UTF-8"?> 
<process xmlns="http://drools.org/drools-5.0/process"
         xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
         xs:schemaLocation="http://drools.org/drools-5.0/process drools-processes-5.0.xsd"
         type="RuleFlow" name="flow" id="interactiveJava" package-name="com.geneoz.procedureengine" >
  <header>
    <variables>
      <variable name="smart_guy" >
        <type name="org.drools.process.core.datatype.impl.type.StringDataType" />
        <value>john</value>
      </variable>
    </variables>
  </header>
  <nodes>
    <start id="1" name="Start" x="204" y="12" width="48" height="48" />
    <end id="2" name="End" x="204" y="314" width="48" height="48" />
    <actionNode id="3" name="Question" x="45" y="157" width="130" height="48" >
        <action type="expression" dialect="java" >System.out.println("Current name is " + smart_guy);
System.out.println("Who is the smartest man in the world?");
java.io.BufferedReader br = new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
String name = null;
try {
 name = br.readLine();
} catch (java.io.IOException e) {
 System.out.println("Error!");
}
kcontext.setVariable("smart_guy", name);
System.out.println("Got " + name);</action>
    </actionNode>
    <split id="4" name="Gateway" x="205" y="229" width="49" height="49" type="2" >
      <constraints>
        <constraint toNodeId="2" toType="DROOLS_DEFAULT" name="correct" priority="1" type="code" dialect="java" >return smart_guy.equals("lim");</constraint>
        <constraint toNodeId="5" toType="DROOLS_DEFAULT" name="incorrect" priority="2" type="rule" dialect="mvel" >eval(true)</constraint>
      </constraints>
    </split>
    <actionNode id="5" name="Error message" x="312" y="156" width="123" height="45" >
        <action type="expression" dialect="mvel" >System.out.println("Wrong you stupid! Try again.");</action>
    </actionNode>
    <join id="6" name="Gateway" x="204" y="96" width="49" height="49" type="2" />
  </nodes>
  <connections>
    <connection from="4" to="2" />
    <connection from="6" to="3" />
    <connection from="3" to="4" />
    <connection from="4" to="5" />
    <connection from="1" to="6" />
    <connection from="5" to="6" />
  </connections>
</process>