I have been developing an app with GWT and have recently moved my development platform to a 64-bit Dell Poweredge running Ubuntu 15.10. I installed Eclipse Mars. 1 Release (4.51) and downloaded and installed the GWT Plugin and SDK. When I attempt to open the GWT Designer, I initially received a message stating that I did not have a compatible version of XULRunner installed. I finally found what was listed as a compatible version at http://ftp.mozilla.org/pub/mozilla.org/xulrunner/nightly/2012/03/2012-03-02-03-32-11-mozilla-1.9.2/xulrunner-18.104.22.168pre.en-US.linux-x86_64.tar.bz2. and installed it. Now, I no longer get the error message but GWT Designer still does not open. Rather, it freezes with a dialog box that states 'initializing.' From the log, it appears that it starts the local http server. At this point, I am dead in the water. I don't see anything else in the logs that indicate what the problem is.
I would greatly appreciate any feedback or direction on resolving this issue. My code compiles correctly but GWT Designer simply will not load.
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