I had similar problem like Chris. the problem was Eclipse/M2Eclipse conflict.
M2EClipse would overwrite Eclipse classpath, and things would work and stop working at random. especially after mvn clean. It also affects JUnit, if you google Eclipse Maven JUnit ClassNotFound, you come across many issues that are still open this is nothing new, many posts dating back to 2008 with the same problem. many hacks were proposed and I tried them all for two days, with no luck, I then switched to IntelliJ and everything worked just fine right away. the reason I kept pushing for two days to make Eclipse work, was to take advantage of CodePro Analytix, but unfortunately it is only available for Eclipse, and Clover by Atlassian is , well, pricey :") http://jira.codehaus.org/browse/MECLIPSE-132 https://issues.sonatype.org/browse/MNGECLIPSE-2121 http://rbtech.blogspot.com/2009/09/eclipse-galileo-javalangclassnotfoundex.html http://blog.andrewbeacock.com/2008/11/classnotfoundexception-when-running.html -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.