GWT Compilation Error - IncompatibleClassChangeError

Question

When compiling the project, I get this obscure Exception

Looking for precompiled archives.  To disable, use -Dgwt.usearchives=false
Loading archived module: jar:         


        

Answer 1

For me, I wasn't using gwt-servlet.jar and dependencies were referencing old versions of it. I added the latest (matching my gwt-user.jar) as a regular dependency and Maven then knew to only use the latest version. You can check your dependency tree with mvn dependency:tree -Dverbose