I have problem with my conncetions list in Sql Developer 188.8.131.52 (version with no jre, I'm using jdk1.7). Everything was ok, before I closed sqldeveloper.exe proccess in task manager in windows 7. After that, when I run sql developer once again then all my connections was gone. In Log i have errors:
oracle.jdeveloper.db.DatabaseConnections: DatabaseConnections has no JNDI context so cannot list connections.
oracle.jdevimpl.db.adapter.DefaultContextWrapper: Failed to create naming Context for db connections at url: file:/C:/sqldirectory/system3.0.04.34/o.jdeveloper.db.connection.184.108.40.206.37.59.31/connections.xml
I noticed that when I'm trying export my connections to connections.xml or other file then file connections.xml is empty! Even after sql developer saying that export was succeful!
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.