Sometimes its frustrating to see Jdev closing immediately on opening. We try restarting the machine, re-installing jdev...and nothing seems to be working.
This is a sign that something got corrupted on Jdeveloper.
Best way to get over this issue is to restore it back to the original setting (Ofcourse you loose all your settings, preferences, svn connection, DB settings, external tools, etc ..).
The way you do this is by removing system11.1.1.* folder under jdeveloper. Yes, not the best soution, but better than re-installing jdeveloper.
On restarting JDeveloper, it creates a new system11.1.1* directory.
