Exception: The method XYZ of type ABC must override a superclass method

The method processAction(PortletConfig, ActionRequest, ActionResponse) of type ConfigurationActionImpl must override a superclass method ...

if you get an Exception like this when trying to use @Override on a method that is implementing an interface method, eclipse doesn´t care and you can´t get your ext to build and deploy ... then you have to change the build.properties (you will find it in the root folder of your plugins - sdk):

should be

Java 1.5 allows @Override only for abstract classes, not for interfaces.

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If you have any questions, feel free to leave a comment.