reference/code-museum/src/com/google/gwt/museum/DefaultMuseum.gwt.xml

<module>
    
    <!-- Inherit the core Web Toolkit stuff.                  -->
    <inherits name='com.google.gwt.museum.Museum'/>
    <source path="client/defaultmuseum"/>
      <!-- Specify the app entry point class.                   -->
    <entry-point class='com.google.gwt.museum.client.defaultmuseum.Issue3190'/>
 </module>