Problem with application modules and switching from 2 tier to 3 tier mode

Question

Hello,
I've got an application in 2 tier mode. Now I wanted to switch to 3 tier mode but get a class cast exception. It has turned out, that panelBinding.getApplication().getApplicationModule().findApplicationModule returns in 2 tier mode <ModuleName>Impl and in 3 tier mode oracle.jbo.client.remote.ApplicationModuleImpl. But searching for modul name with panelBinding.getApplication().getApplicationModule().getApplicationModuleNames() returns the right in names in 2 tier and in 3 tier mode. Does anybody know a way to access <ModulName>Impl in 3 tier mode?

Answer 1

This is the reason that the BC4J project will create an <appmodulename>AM interface and a <appmodulename>AMClient Implementation that you include on the client side if you expose any methods in your app module. You should access them by casting it to the interface, NOT the appModuleImpl class. If you stick to using the interface, then you should be fine.
So to keep your implementation flexible, you should do this on the client to access your custom methods on your app module:
The BC4J project should generate the following classes:
AppModule Name = MyCustomAM.xml
AppModule Implementation = MyCustomAMImpl.java
Custom AppModule Interface = /common/MyCustomAM.java
Custom clientside AppModule Implementation = /client/MyCustomAMClient.java
On the client, do the following:
import my.bc4j.model.package.common.MyCustomAM;
// Call custom method on App module
  MyCustomAM am = (MyCustomAM) panelBinding.getDataControl().getApplicationModule();
  am.myCustomMethod(someParams);Hope this helps.
Erik