How to Make Jar/War Archive with Java Classes
To be processed correctly, your jar/war archives with the compiled Java classes
should have the certain structure of folders. They
include the com folder containing all Java classes of your site/application.
This folder has the same structure as the project directory.
The following image demonstrates the structure of jar/war archive:
And here is the structure of com folder in this archive:
The sequence of embedded folders (\com\google\gwt\sample\stockwatcher\ in this example) is the same as in
the project folder.