gwt compile issue

I have a project based on gwt-ext. This project import some third-
party jars. However it didn't compile successfully because the gwt
complier couldn't find the java source code of these third-party jars.
That means that we must have the java source code in the jar package
or in the classpath, otherwise, the project complie fail. However my
project is a util, and i dont want to expose my source as it serve as
3rd jar, how can i do?

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