Try <gwtSdkFirstInClasspath>true</gwtSdkFirstInClasspath> in your gwt-maven-plugin configuration.
Maybe you have libraries in your project that interference with embedded libraries in gwt-dev.jar. -- J. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/groups/opt_out.