I got this error message starting GWT dev server but no exception in the dev mode console.
"Plugin failed to connect to development mode server at localhost:9997"
It had been running fine last time I debugged my GWT stuff so why not now?
In the end I had old App Engine jars in my class path after upgrading to the latest and greatest.
In summary: check your app classpath and also your WEB-INF/lib folders for older versions still hanging about.
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