Application Module getting and using.

Hello all,
I am currently using this code:
DCDataControl dc = daContext.getBindingContext().findDataControl("AppModuleDataControl");
if (dc instanceof DCJboDataControl) {
ApplicationModule appModule = (ApplicationModule) dc.getDataProvider();
ApplicationModuleImpl myAm = (ApplicationModuleImpl)appModule;
It compiles well, but the problem is that the App Module that is returned is of type : WSApplicationModuleImpl.
I need to use the getDBTransaction() method from ApplicationModuleImpl, since when I cast my appModule, i get an error, I was wondering if there was something I was doing wrong.
I have searched high and low, and still haven't found what WSApplicationModuleImpl is for (i know that if I try to use some of the methods of ApplicationModuleImpl I get a moethod 'methodname' is not a working set Application Module method...)

Steve,
I followed the instructions in your article, which gave me a better understanding of the situation but did not resolve my particular issue. I was confused by all the statements and insinuations in both JDev and various articles that configuring application modules to use interfaces is really to support a client that is not colocated with the business services. I did not see the relevance of the interfaces to getting the appropriate data type back from the data control (MyAppModule rather than WSApplicationModuleImpl, for example). Anyway, I followed the steps from that article that related to the application module. I did not create interfaces for the other business components (views, entities, etc). I continued to get back the wrong data type when retreiving the application module from the data control in an action. So I kept looking for other clues and finally came across the article about when to use batch mode (http://www.oracle.com/technology/products/jdev/tips/muench/batchmode/index.html). Reading that one of the benefits of batch mode is better enforcement of programming business calls to interfaces I thought I'd try changing the sync to immediate rather (from the default, batch). This did exactly what I was originally trying to do. It caused the data control to return a MyAppModuleImpl rather than a generic WSApplicationModuleImpl. Finally I could call methods on the business service from actions.
After learning about batch mode, I understand that my change is not advisable in the grand scheme of clean design. Unfortunately, even though I believe that I have all the components in place to support a clean design, the batch mode seems to be preventing me from getting data type back.
So I write this for the next person to run into ClassCastExceptions when attempting to retrieve their application module, since I haven't seen it suggested before: look into batch vs. immediate mode - at the very least it will help you diagnose the problem.
Jeff

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public void setBindingContainer (DCBindingContainer bc) {this.bindingContainer = bc;}
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Application Module getting and using.

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