oracle 10xe, oracle 12705 cannot access nls data files or invalid environment specified

Issue

Can not connect to Oracle10g Express edition from SqlDeveloper. Following error occured: oracle 12705 cannot access nls data files or invalid environment specified

Solution

Add option to  sqldeveloper.conf

AddVMOption -Duser.region=US
AddVMOption -Duser.language=EN

Oracle Sql Developer migrate connectons

Use Case

You've reinstalled OS from a scratch and need to import your Oracle Sql Developer settings

Solution
Copy file "I:\Users\xxx\AppData\Roaming\SQL Developer\system1.5.4.59.40\o.jdeveloper.db.connection.11.1.1.0.22.49.48\connections.xml" to appriate location on your system drive

where I: - your backup disk drive, xxx - your username

More information can be found at: http://www.webxpert.ro/andrei/2008/06/12/oracle-sql-developer-import-connections/