Re: Returning String From JSNI method

Because your request is asynchron and your JSNI code does not wait at the $wnd.$.get call. Your method will complete immediately and return nothing as it does not have a return statement.

You would need to change your getData() method to something like:

public native void getData(String trainerName, Callback callback)/*-{
 $wnd.$.get( "http://testdastuff.dev/trainerstats", { trainer: trainerName} )
 .fail(function() {
    callback.@com.example.Callback::onFail()();
 })
 .done(function( data ) {
    callback.@com.example.Callback::onSuccess(Ljava/lang/String;)(data);
 });

 }-*/;

-- J.

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