Dynamic region bugs and bad documentation

Question

I cannot get the second taskflow to behave correctly in a dynamic region.
Here's my scenario:
In the pursuit of resusablilty, I have two taskflows that are coming from ADF Library Jars into a master application.
Both taskflows have their own associated application modules, which appear as data controls in the master project.
Following the instructions in the Fusion Developers guide, I create a dynamic region and dynamic links.
After swapping to the second task flow, when I click on a different table, I get an error that a target is unreachable:
Target Unreachable, 'RoleId' returned null
For more information, please see the server's error log for an entry
beginning with: Server Exception during PPR, #1{code}
I posted the problem originally under this thread: [dynamic region errors
and got a response that I didn't understand -- both taskflows have data-control-scope = shared.
In contrast to the problem using a dynamic region, if I build a different page in the master application and use each taskflow as *separate* regions (via a tabbed panel), they work fine.
So it doesn't seem there is anything wrong with the taskflows per se, but rather something in the dynamic region switching mechanism that is broken.
I'd appreciate hearing from anyone who has had similar problems or anyone who knows of a solution.
In exasperation, lili5058
UPDATE
Sorry for the earlier rant. I figured out the reason for the odd behavior and it has to do with the code generated by the wizard. This code isn't so much wrong as it is short-sighted. Here's the code generated for the managed bean by the wizards for creating a dynamic region and dynamic link that is put into *backingBeanScope*:
{code:java}package view.beans;
public class DynamicRegionBean {
private String taskFlowId = "/WEB-INF/taskflow1.xml#first-taskflow";
public DynamicRegionBean() {
public TaskFlowId getDynamicTaskFlowId() {
return TaskFlowId.parse(taskFlowId);
public String firstTaskflowtaskflow() {
taskFlowId = "/WEB-INF/taskflow1.xml#first-taskflow
return null;
public String secondTaskflowtaskflow() {
taskFlowId = "/WEB-INF/taskflow2.xml#second-taskflow";
return null;
}{code}
The user is taken to the second task flow by clicking the link that executes the secondTaskflowtaskflow() handler, however, any subsequent requests take the user back to the first taskflow, i.e., the one assigned to the private instance variable, since that's how the wizard wrote the code. This explains why the table on the second taskflow displayed "Fetching Data . . .". The table's content delivery was set to lazy, so when the browser issued the AJAX request to get the data for the table, the task flow switched back to the first one and thus making the data unavailable. Changing the the content delivery attribute value to immediate, brings up the data initially, but any subsequent work on that taskflow routed the user right back to the first taskflow.
I ended up fixing the problem by adding the TaskFlowId (data type) to the pageFlowScope map, so it would be remembered across requests until the user deliberately requests a different taskflow.
Edited by: lili5058 on Feb 7, 2009 12:56 PM
Edited by: lili5058 on Feb 7, 2009 5:06 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Answer 1

Hi,
chances are you are hitting a bug. But this is hard to say from here. If you want, we can further track the issue down. I suggest you exclude the use of ADF libraries and verify that the scenario works if the two taskflows work in the mentioned scenario of they are both defined in the project itself. If this works then it seems like a bug that should be filed. Can you verify this ?
Frank