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A quirk updating to GWT 2.5

Posted & filed under Coding Tips.

GWT 2.5 code inconsistently uses the new EventBus.

While updating some GWT code to version 2.5 I found that PlaceController using com.google.gwt.event.shared.EventBus has been deprecated for methods using com.google.web.bindery.event.shared.EventBus. No problem, just a quick refactor I think, only to find that now my Activities do not compile as they require the old EventBus. Catch 22.

This is a known problem (Issue 6653).  Using a suggestion from there I created the following wrapper to resolve this. Now my Activities implement my NewAbstractAcitivty using the new EventBus and when Issue 6653 is fixed the wrapper can be easily removed.

 

package com.whoson2day.client.activity;

import com.google.gwt.activity.shared.AbstractActivity;
import com.google.web.bindery.event.shared.EventBus;
import com.google.gwt.user.client.ui.AcceptsOneWidget;

/**
 * The Class NewAbstractActivity.
 *
 * Wrapper to correct GWT issue 6653 –
 * com.google.gwt.activity.shared.Activity should use the new EventBus in 2.4
 * http://code.google.com/p/google-web-toolkit/issues/detail?id=6653
 * http://gwtramblings.blogspot.com.au/2011/09/gwt-24-new-placecontrollereventbus.html
 *
 */
public abstract class NewAbstractActivity extends AbstractActivity {

    /**
     * Instantiates a new new abstract activity.
     */
    public NewAbstractActivity() {
    }

    /* (non-Javadoc)
     * @see com.google.gwt.activity.shared.Activity#start(com.google.gwt.user.client.ui.AcceptsOneWidget, com.google.web.bindery.event.shared.EventBus)
     */
    @Override
    public void start(AcceptsOneWidget panel, com.google.gwt.event.shared.EventBus eventBus) {
        start(panel, (EventBus)eventBus);
    }
   
    /* (non-Javadoc)
     * @see com.google.gwt.activity.shared.Activity#start(com.google.gwt.user.client.ui.AcceptsOneWidget, com.google.gwt.event.shared.EventBus)
     */
    public abstract void start(AcceptsOneWidget panel, EventBus eventBus);

}

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