I am not sure whether you checked up on google groups for this. This works for me https://groups.google.com/forum/?fromgroups=#!topic/google-web-toolkit/a8OsRmMSaMg
Create file jetty-web.xml
in yours WEB-INF
directory
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN"
"http://jetty.mortbay.org/configure.dtd">
<Configure class="org.mortbay.jetty.webapp.WebAppContext">
<Set name="contextPath">/myapp</Set>
</Configure>
Solution for GWT >= 2.6
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC
"-//Mort Bay Consulting//DTD Configure//EN"
"http://www.eclipse.org/jetty/configure_9_0.dtd">
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
<Set name="contextPath">/contextpath</Set>
</Configure>