How to access BPM 11g payload or process varibles in ADF task flow

Question

I am trying to view/edit data in a UI tied to a database using a foreign key, requestId. The foreign key comes from a BPM process where it is passed into the task flow, from a human task. The foreign key comes from process variables or payload values. I know I can simply load the payload in BPM with data from the tables, but I'm looking for a better solution to leverage ADF Business components to view and edit the data directly in the UI.
The BPM process uses a web service to kick off the process. The web services takes a primary key as a parameter to reference a column in the database table. The database is pre-populated with content and a primary key reference. The first activity is a user activity. I want the task flow behind the user activity to accept this primary key and use it to locate the desired row in the database so views associated with database bounded ADF Business Components can work to present the data in the UI.
I've tried two approaches to the problem. The first uses the operation setCurrentRowWithKeyValue. The other modifies the SQL where clause, used by the ADFbc Iterator, to only return a row for the given requestId. Both approaches fail to work because I don't know how to access the BPM payload or data variables coming into the task flow. Here's the snipet of code I used to try to set the row using setCurrentRowWithKey value:
public String setRequestId() {
FacesContext context = FacesContext.getCurrentInstance();
Object requestObj = context.getApplication().evaluateExpressionGet(
context, "#{bindings.RequestId.inputValue}", Number.class);
if (requestObj== null)
return null;
Number requestId;
requestId = (Number)requestObj;
DCIteratorBinding itr = (DCIteratorBinding)
getBindings().get ("PatfRequestHdrView1");
itr.setCurrentRowWithKeyValue(requestId.toString() );
return null;
I haven't gotten very far with the second approach, modified SQL where clause, since I don't know Groovy. I think I need something like:
adf.object.viewObj.RequestId. But there isn't a viewObject associated with BPM data, so I'm sure this particular expression won't work.
Any help you can give me is very appreciated.
Regards,
Mark

Answer 1

The first thing I want the task flow to do is display a page with a form showing the values from the database. This is why I tried to call the method first. If I add the setCurrentRowWithKey to the form as a button, I can get the form to load the data, but it's a two step process, requiring the user to click a button. The method approach throws the following exceptioin
oracle.adf.controller.activity.ActivityLogicException: ADFC-02013: The ADF Controller cannot find metadata for activity '/WEB-INF/ApproveTravel_TaskFlow.xml#ApproveTravel_TaskFlow@setTravelRecord'.
     at oracle.adfinternal.controller.util.Utils.createAndLogActivityLogicException(Utils.java:230)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.doRouting(ControlFlowEngine.java:927)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.doRouting(ControlFlowEngine.java:777)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.routeFromActivity(ControlFlowEngine.java:551)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.performControlFlow(ControlFlowEngine.java:147)
     at oracle.adfinternal.controller.application.NavigationHandlerImpl.handleAdfcNavigation(NavigationHandlerImpl.java:109)
     at oracle.adfinternal.controller.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:78)
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:130)
     at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:190)
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:475)
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:756)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:698)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:285)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:177)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.share.http.ServletADFFilter.doFilter(ServletADFFilter.java:62)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:2