External Task - prepared and commit method

Question

Hey guys,
I have a problem with External Task. I don't know how make a prepared and commit method for use with J2EE Application Server.
Anyone have an example?
tks

Answer 1

I am having some issue with the Externhal Task prepare and commit method,
Actually I am ponting the interactive activity to external Task and in the external task i am getting instanceID , participantId and activity as query paramenters.Using those query paramemeters i am initalizing the ProcessServiceSession and then making call to prepareActivate Method as below.
I am getting query string instnaceId value like " %2FScorecardChallenge%23Default-1.0%2F4%2F0 " .
And I tried to call the IntsnaceID method InstanceId.getProcessId(instanceId), but this getProcessId method gives Null value.
Is there any idea why i am getting the Null processID value for the instanceIdString " %2FScorecardChallenge%23Default-1.0%2F4%2F0 ".
My sampel code looks like below ....
String instanceId = this.getRequest().getParameter("instanceId");
               String activity = this.getRequest().getParameter("activity");
               String participantId = this.getRequest().getParameter("participantId");
               this.getRequest().setAttribute("activity",activity);
               this.getRequest().setAttribute("isFromBpm","true");
               try
                    System.out.println("########### BPM params" + instanceId + " : " + activity + " : " +participantId);
                    ProcessServiceSession bpmSession = ConnectPAPI.createSession(participantId,this.getRequest().getRemoteHost());
               String pid=InstanceId.getProcessId(instanceId);
               System.out.println("Process ID value "+ pid);
               System.out.println("Instance ID value "+ InstanceId.getInstanceId(instanceId));
               System.out.println("Instance ID value "+ InstanceId.getInstanceIn(instanceId));
                    if(bpmSession != null)
                    {  try{
                                                                           Arguments args = bpmSession.activityPrepare(activity,instanceId,Arguments.create());
                                   Map argument =(Map) args.getArguments();
                                   Iterator it = argument.entrySet().iterator();
                                   while (it.hasNext()) {
                                   Map.Entry pairs = (Map.Entry)it.next();
                                   String key = (String)pairs.getKey();
                                   Object value = pairs.getValue();
                                   System.out.println("########### BPM args" + key + " : " + value + " : " );
But my problem here is I am getting null pointer exception like below ( I found that null pointer exception is coming because processID ivelue is null).
Stack Trace is output :
Process ID value null
Instance ID value %2FScorecardChallenge%23Default-1.0%2F4%2F0
Instance ID value -1
bpmSesssion instance details abstract class fuego.papi.ProcessServiceSesion
bpmSesssion instance is not null
java.lang.NullPointerException
     at fuego.directory.DirDeployedProcess.isConsolidatedId(DirDeployedProcess.java:114)
     at fuego.papi.impl.ProcessServiceSessionImpl.getProcessControl(ProcessServiceSessionImpl.java:2328)
     at fuego.papi.impl.ProcessServiceSessionImpl.processGetInstance(ProcessServiceSessionImpl.java:1926)
     at fuego.papi.impl.ProcessServiceSessionImpl.activityPrepare(ProcessServiceSessionImpl.java:1128)
     at com.rollsroyce.gsp.poc.samplePOC.SamplePOCController.begin(SamplePOCController.java:57)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.beehive.netui.pageflow.FlowController.invokeActionMethod(FlowController.java:879)
     at org.apache.beehive.netui.pageflow.FlowController.getActionMethodForward(FlowController.java:809)
     at org.apache.beehive.netui.pageflow.FlowController.internalExecute(FlowController.java:478)
     at org.apache.beehive.netui.pageflow.PageFlowController.internalExecute(PageFlowController.java:306)
     at org.apache.beehive.netui.pageflow.FlowController.execute(FlowController.java:336)
     at org.apache.beehive.netui.pageflow.internal.FlowControllerAction.execute(FlowControllerAction.java:52)
     at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
     at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.access$201(PageFlowRequestProcessor.java:97)
     at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor$ActionRunner.execute(PageFlowRequestProcessor.java:2044)
     at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors$WrapActionInterceptorChain.continueChain(ActionInterceptors.java:64)
     at org.apache.beehive.netui.pageflow.interceptor.action.ActionInterceptor.wrapAction(ActionInterceptor.java:184)
     at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors$WrapActionInterceptorChain.invoke(ActionInterceptors.java:50)
     at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors$WrapActionInterceptorChain.continueChain(ActionInterceptors.java:58)
     at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors.wrapAction(ActionInterceptors.java:87)
     at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processActionPerform(PageFlowRequestProcessor.java:2116)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
     at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processInternal(PageFlowRequestProcessor.java:556)
     at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:853)
     at org.apache.beehive.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:631)
     at org.apache.beehive.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:158)
     at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
Please help me , is any knows the problem.........................................