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How to specify com.google.gwt.dev.DevMode as the main class automatically when debug gwt code

This happens because the Google Plugin for Eclipse cannot determine the version of your GWT, and falls back to assuming it's an ancient version, where DevMode didn't exist yet and GWTShell should be used.

Update to GWT 2.6.1 (download the SDK from http://www.gwtproject.org/download.html and configure it in Eclipse) to fix the issue.

See https://code.google.com/p/google-web-toolkit/issues/detail?id=8556

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