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    <p>Why don't you create a new service method that returns all the data as a result?</p> <p>The implementation of such a method could simply call all of the other methods. You will have to encapsulate all the required data and return it as a single result. One example how you could handle this:</p> <p>In the service implementation:</p> <pre><code>@Override public Data getAllData(){ List&lt;Cars&gt; cars = this.getAllCars(); List&lt;School&gt; schools = this.getAllSchools(); return new Data(cars, schools); } </code></pre> <p>And you can then use the method like this:</p> <pre><code>service.getAllData(new AsyncCallback&lt;Data data&gt;() { @Override public void onSuccess(Data data) { fillCarListBox(data.getCars()); fillSchoolListBox(data.getSchools()); } @Override public void onFailure(Throwable caught) { Window.alert("Pogreska..."); } }); </code></pre> <p>With this kind of approach you minimize the number of service calls on your client side. This not only creates a more readable code, but also usually speeds up the client side of your app. You should always try to minimize the number of service calls, ideally to a single one.</p> <p>Concerning the more general question of collecting a number of asynchronous callbacks, a good approach is to use the <strong>Command Pattern</strong>. Gwt Remote Action is a library that provides an implementation of the mentioned pattern for doing RPC calls:</p> <p><a href="http://code.google.com/p/gwt-remote-action/" rel="nofollow noreferrer">http://code.google.com/p/gwt-remote-action/</a></p>
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    1. POHow to collect a number of asynchronous callbacks?
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