Whats the use of this(); in the AppEngine Example

Hello,

I'm completing the tutorial of GWT with Google App Engine
http://code.google.com/intl/es/webtoolkit/doc/1.6/tutorial/appengine.html

In one example I see this:

public Stock(User user, String symbol) {
this();
this.user = user;
this.symbol = symbol;
}

What's the use of the method : this();

Is it a constructor initializing the class? Any Ideas?

Thx

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