Then the very first thing to do is stop using the embedded Jetty of GWT
DevMode as application server. The embedded Jetty in GWT DevMode does some
ClassLoader hacks and it often causes issues for people using the embedded
Jetty as application server. That is the reason why GWT 2.11 has
thank you @jens for your answer
I started by upgrading gwt Only from version 2.8.2 To 2.10.0 and I kept
java 8 .
I my jetty-env.xml file i had org.eclipse.jetty.webapp.WebAppContext as a
configurationClass, so It cause fd ollowing error when launching
java.lang.ClassNotFoundException:
I would first focus on upgrading Java, GWT and possibly GXT if it is
incompatible with newest GWT. The DataSource error will go away once you
upgrade GWT because newer GWT versions use a newer Jetty. Keep in mind that
in newest GWT the use of embedded Jetty as appliction server during
