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I use vaadin 6.7.1 to develop my client application, in the release notes it is told vaadin 6.7.1 depends on GWT 2.3.x lib. However I just downloaded it and overwrote the vaadin6.7.1.jar in the folder:\WebContent\WEB-INF\lib, and in Eclipse IDE added GWT 2.3.x related jar files, it is okay to compile the code and the app works as well in Browser+Tomcat after my manual creating the war for my application and copied to the webapps of Tomcat home directory.
So my question is where the GWT jar files are utilized at runtime, I didn't see anything related to GWT jar files in the war package.