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Unknown resource type: null when call kagent.applyChangeSet( resource ) the second time.
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created by <a href="https://community.jboss.org/people/devilkazuya99">TC ONG</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/722709#722709">View the full discussion</a>
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<div class="jive-rendered-content"><pre><p>          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);
</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></pre><p><span style="font-family: 'Lucida Grande', Arial, Helvetica, sans-serif; background-color: #ffffff;">The code above is ok but when I call </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre>kagent.applyChangeSet( resource );</pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>again then I get</p><pre>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)</pre></div>
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