From: <glassfish_at_javadesktop.org>
Date: Fri, 18 Sep 2009 11:54:08 PDT

I have seen this problem in my gwt project that uses jersey to implement the backend server. There is no glassfish container. The problem occurs if I have not run "mvn clean install" prior to running "mvn gwt:run target"
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http://forums.java.net/jive/thread.jspa?messageID=364694