Senthil Sathiya [https://community.jboss.org/people/skumar0105] created the discussion "Re: Error starting process instance - getting HTTP 500: Unknown error" To view the discussion, visit: https://community.jboss.org/message/831217#831217 -------------------------------------------------------------- Hi Maciej, Thanks for your reply. I went through the documentation and followed the steps . First , created a sampleprocess.bpmn with - start --->  task (CustomHandler) -> and end event . 2) Wrote a CustomHandler.java workItem handler class package com.sample.bpmn.project; import org.apache.log4j.Logger; import org.drools.runtime.process.WorkItemHandler; import org.drools.runtime.process.WorkItem; import org.drools.runtime.process.WorkItemManager; public class CustomHandler implements WorkItemHandler {    static Logger log = Logger.getLogger(             CustomHandler.class.getName());     //@Override     public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {                // extract parameters              System.out.println("aborting *****");     }     //@Override     public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {        System.out.println("The custom work handler is successfully invoked");             log.info("The custom work handler is successfully invoked");        manager.completeWorkItem(workItem.getId(), null);     } } and packaged it into a .jar and  copied it into ..\jboss-as-7.1.1.Final\standalone\deployments\jbpm-gwt-console-server.war\WEB-INF\lib\  and ..\jbpm-installer\jboss-as-7.1.1.Final\standalone\lib directories. 3) In guvnor, created a workitem defintion CustomWorkItemHandler ( Not sure if this is required ) import org.drools.process.core.datatype.impl.type.ObjectDataType; import org.drools.process.core.datatype.impl.type.StringDataType; [   [     "name" : "CustomHandler",     "parameters" : [         "MyFirstParam" : new StringDataType(),         "MySecondParam" : new StringDataType(),         "MyThirdParam" : new ObjectDataType()     ],     "results" : [         "Result" : new ObjectDataType()     ],     "displayName" : "CustomHandler",     "icon" : "",   ] ] Successfully packaged and deployed the sampleprocess and wid into the GWT console server via guvnor. 4) Modified the CustomWorkItemHandlers.conf file and added the following entry [   "Log": new org.jbpm.process.instance.impl.demo.SystemOutWorkItemHandler(),  "CustomHandler": new com.sample.bpmn.project.CustomHandler(), ] 5) Restarted the server . I was able to see the SampleProcess in the webconsole , but when I tried to start it , blew up again with the same error message . I am really frustrated :( , not sure what I am missing here. . Any help would be highly appreciated . Thanks Senthil -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/831217#831217] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Senthil Sathiya [https://community.jboss.org/people/skumar0105] created the discussion "Re: Error starting process instance - getting HTTP 500: Unknown error" To view the discussion, visit: https://community.jboss.org/message/831505#831505 -------------------------------------------------------------- Thanks for your reply . The CustomWorkItemHandlers.conf file is located within the jboss-as-7.1.1.Final\standalone\deployments\jbpm-gwt-console-server.war\WEB-INF\classes\META-INF\ directory . Let me try modifying the session.template and see if that works . I will get back to you after making the changes . Thanks again :) -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/831505#831505] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]