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copied!<p>The <a href="http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/client/ui/Composite.html#initWidget%28com.google.gwt.user.client.ui.Widget%29" rel="nofollow"><code>initWidget(Widget widget)</code></a> is a method of the <a href="http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/client/ui/Composite.html" rel="nofollow"><code>Composite</code></a> class used to initialize itself as a wrapper for a possible inner aggregation of widgets. Generally you create a composition of widgets rooted on a given widget and then pass it to the <code>initiWidget()</code> method. This way, the rooted element is not exposed (in terms of its methods) but still acts as if it was never wrapped.</p> <p>In your sample you have <code>UiBinder</code> takes care of defining the UI, so you pass to such method the return of the binding creation (<code>uiBinder.createAndBindUi(this)</code>). Before this call (actually, before the <code>createAndBindUi()</code>, but generally it is tied to the <code>initWidget()</code>), you <em>must</em> instantiate all your widget marked with <code>@UiField(provided = true)</code> i.e., all those who need a proper initialization otherwise impossible in plain <code>UiBinder</code> style. In your case, you don't need to mark everything <code>provided = true</code>, only the <code>CellTable</code> requires that (for the specialization).</p> <p>Back to your problem, if you remove the <code>configureDataProvider()</code> call, you will never set up the <code>AsyncDataProvider</code> and simply you will see no data at all (the spinning gif is because somewhere - can't remember where now - the row count has been set to 0). If you enable it, the call to <code>addDataDisplay()</code> will implicitly force a range update that will end up calling the <code>AsyncDataProvider</code> to request your data.</p> <p>The problem is that you do not update both the row data <em>and</em> the row count at the same time in the <code>onSuccess()</code> callback. See <a href="http://turbomanage.wordpress.com/2011/03/02/gwt-2-2-asyncdataprovider-celltable-gotcha/" rel="nofollow">here</a>.</p> <p>Also, you don't need to call <code>updateRowCount()</code> after <code>addDataDisplay()</code>, otherwise two requests will be made to retrieve the same initial data, which is unnecessary.</p>

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