Found in GWT Release (e.g. 1.5.3, 1.6 RC):

• Found in 2.2.0
• Still present in 2.3.0

Encountered on OS / Browser (e.g. WinXP, IE6-7, FF3):

• Win7

Detailed description (please be as specific as possible):

I can easily reproduce the encountered problem with HandlerDemo.java (here: http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/test/com/google/gwt/uibinder/test/client/HandlerDemo.java)

1) Use HandlerDemo.java

1) Modify the declaration by creating a generic type declaration as following:

e.g. replace public class HandlerDemo extends Composite by public class HandlerDemo<T> extends Composite

2) Use this class e.g. RootPanel.get().add(new HandlerDemo<String>());

3) Run the dev mode

You should get these errors:

• DEBUG: Rebinding com.mySampleApplication.client.HandlerDemo.MyUiBinder. ERROR: Deferred binding failed for 'com.mySampleApplication.client.HandlerDemo.MyUiBinder'; expect subsequent failures. DEBUG: Invoking generator com.google.gwt.uibinder.rebind.UiBinderGenerator. WARN: The method 'getAssociatedType()' in 'ValueChangeEvent' does not return Type<? extends EventHandler>.. ERROR: Parameter 'ValueChangeEvent' is not an event (subclass of GwtEvent)..

Workaround if you have one:

1) Do not use @UIHandler with a typed event if the class to bind with template is typed and add manually ValueChangeHandler

e.g.:

myCheckBox.addValueChangeHandler(new ValueChangeHandler<Boolean>() { @Override public void onValueChange(ValueChangeEvent<Boolean> booleanValueChangeEvent) { // do something... } });

Still present in GWT 2.4. Reproducible on Red Hat Linux x64 / FF7.

Attaching updated example with non-relevant stuff removed.

Still present in 2.5-rc1

The issue is that the UiBinder is declared with the raw type, so the generator subsequently only sees raw types down until ValueChangeEvent#getAssociatedType returning a raw GwtEvent.Type.

Declaring the UiBinder with a wildcard type is enough to make it compile. I.e.: interface MyUiBinder extends UiBinder> {} instead of: interface MyUiBinder extends UiBinder {}

Comment deleted

Hi, is this issue still present in current GWT version?

This seems to be still an issue in 2.5.1 I have the Ui Binder declared with a wildcard type but of course I need to have my ValueChangeEvent declared with the wildcard as well and then downcast it to the type I want. It seems that it defeats the purpose.