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My operating system is windows 7.
When I add some connection and after that close sql developer and open it's again then all my connections are gone, connections navigator is empty.
I tried to change sqldeveloper.conf and delete AppData/Roaming/Sql Developer/... from user's directory.
Maybe it's jdk7 fault?
As you can see from these earlier discussions on the forum, Java 7 is not certified but some have supposedly stayed with it:
SQLDeveloper and JDK 1.7
SQL Developer 3.0 and Java SE 7?
I recommend using the latest available update in the jdk1.6.0 series instead. Normally deleting the AppData/.../SQL Developer/... folders and restarting SQL Developer fixes any problems, but perhaps this problem is some combination of Java 7 and product initialization without any migration.
Hope this helps,
SQL Developer Team