Your problem arises due to misunderstanding the nature of asynchrounos
callbacks. Since these are asynchronous, the program will not wait for
the return value before continuing execution. This means that you'll
have this flow in your onModuleLoad() method:
obtenerCompetencias();
set up callback
fire http-request to server
crearTabs(getCompetencias());
fails, since getCompetencias() = null;
Panel panel = getPanel();
Viewport viewport = new Viewport(panel);
...
...
onSuccess()/onFailure() is called.
Instead, I suggest this approach (I use pseudo-code):
in onModuleLoad():
set up a panel with a wait msg. Maybe a spinning gif, or something.
run obtenerCompetencias();
in AsyncCallback.onSuccess():
make a grid with the returned values.
remove the wait msg from the panel.
add the grid.
Also, you might run into difficulties with just using "ArrayList". If
you know the type of object this arraylist may contain, specify it, to
make it serializable, ie. ArrayList<String> or
ArrayList<SomeSerializableObject>.
/Thomas Arp
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