ADF Task Flow based on HumanTask - Region withiin Task form

Hello All,
Was wondering if anybody here has sucessfully used region in their human task forms? I really like the idea of regions and after going through the tutorial here* I tired to implement it.
Following are some additional details of the issue I'm facing.
I have created a UI project based on a human task. The main <human task>_taskFlow.xml is bounded and non-fragmented. I then dropped 'view' component within this task flow and create a blank jspx page underneath. I then dragged and droped another bounded and fragmented task flow (which is also a train) on to this jspx page. The 2nd task flow has some jsff pages in a train. When I deploy run this bpm project,I can't see train form within the region and I get following Null Pointer Exception on the server:
java.lang.NullPointerException
     at oracle.adfinternal.view.faces.renderkit.rich.FormRenderer.encodeAll(FormRenderer.java:233)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
Any help would be much appreciated.
*http://st-curriculum.oracle.com/obe/jdev/obe11jdev/ps1/boundedtaskflow/bounded_task_flow.html

Update: After struggling with it almost whole day, I recreated the UI project and the problem has gone away.

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Say for instance, on search page user press ' CreateInsert' button which takes the user to edit page and then without saving the new record user presses 'Search' button which takes the user to search page and so repeated goes back and forth cycle.
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Thanks
Edited by: user5108636 on Oct 26, 2011 5:16 PM
Edited by: user5108636 on Oct 26, 2011 5:24 PM

Hi Frank,
I checked the DB sequence is setup correctly. I have also modified the problem description above for better understanding.
2. When users press OK, navigate to a commit method activity (just drag and drop the commit operation).
-- When user presses OK, I need to rollback instead of commit to make users lose the unsaved work and controller should navigate to the search page. Here, the message panel with Cancel and OK is shown automatically with the <af:checkUncommittedDataBehavior/> property, I thought the framework will do the rollback for me. If I need to do rollback manually, how to do it, because I cannot see the JSF related source code for the <af:checkUncommittedDataBehavior/> dialog box. Please suggest what to do
3. If they press cancel, have the return activity rolling back to the save point taken when the user entered the bounded task flow (edit task flow)
-- If they press cancel, user stays on the same page, so I will leave future action to the user. This bit is working fine in my app.
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Edited by: user5108636 on Oct 26, 2011 5:23 PM

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Another way of saying it is, if sub-flow starts a nested activity and that nested activity exits out to utilize sub-flow's view. The high level definition which is mainFgmt's refresh ifNeeded is restarting sub-flow.
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Now in this scenario, it seems like the sub-flow needs to have a view established first for it to be properly be used.
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Can I consider the behavior of the refresh=ifNeeded as a bug in this usecase?
Would it be better to utilize a different way of refreshing (maybe combination of refresh condition) to get around the issue?
Is the use of the task flow as defined logical or does it cross any boundary or best practice that might be causing this behavior?

Hi,
actually you lost me in your description due to complexity. I lived under assumption that sub-flow already is a region on a view in main flow, but then you sad that
"!important - has a nested taskflow (task flow call as defined in the component pallete) called inner-flow (see below)"
which then confused me as to I have no idea if inner flow now is the second level nesting or first level nesting (should be second level nesting). If sub-flow is a region then having "has an inputParameter SampleBean.java (because it is an input parameter, by default it will be at pageFlow scope)" is an unnecessary broad scope because the region wont live longer than view scope.
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Frank

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3 different ways to retrieve the username (not sure what you mean by user ID) :
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3 different ways to retrieve the username (not sure what you mean by user ID) :
http://mahmoudoracle.blogspot.be/2012/06/adf-get-current-logged-user-name.html#.USI_c-h8zIo
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ADF Task Flow based on HumanTask - Region withiin Task form

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