At present I cannot run it (SQL Developer 4.1) because it hangs on "Restoring Editors" while starting. I suppose I've done it by exiting it before by killing sql developer process because it was hanged on fetching objects to Schema Browser so long... Maybe I would clean some temporary files but can't find any. Any ideas?
It's possible that your Windows jdk path isn't recognizable or missing. You should have sqldeveloper. conf file that contains a reference to your JDK directory. Find your jdk path and make sure it's reflected in your sqldeveloper.
To kill a session: In SQL Developer, click Tools, then Monitor Sessions. In the Select Connection dialog box, select a connection to SYSTEM (or another account with full DBA privileges) Right-click in the row for the session to be terminated, and select Kill Session.
Deleting files from c:\Users\MY_USER\AppData\Roaming\SQL Developer\SQL History and c:\Users\MY_USER\AppData\Roaming\SQL Developer\System... Really helped me to resolve the connection issues
Basing on this thread https://community.oracle.com/thread/2564842 I've created own solution.
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