UIHandler not working

[KK]

I created one simple program to test the UIHandler annotation from the
tutorial.

        @UiHandler("button")
        void handleClick(ClickEvent e) {
            Window.alert("Hello, AJAX");
          }


But this event is not getting triggerred when i click on the button.

Any clues ?

public class HelloWorld extends Composite {

        interface HelloWorldUiBinder extends UiBinder<Widget, HelloWorld> {
        }

        private static HelloWorldUiBinder uiBinder =
GWT.create(HelloWorldUiBinder.class);

        @UiField Button button;

        @UiHandler("button")
        void handleClick(ClickEvent e) {
            Window.alert("Hello, AJAX");
          }


        public HelloWorld() {
                initWidget(uiBinder.createAndBindUi(this));
                }
        }

}

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