Can't connect to local database Today I created a local database on my computer. 
Then I installed SQL Developer. But I can't connect. 

It gives me this error: 


  "Status : Failure -Test failed: Locale not recognized"




My database version: 11.2.0.1.0 

Now I have only one  instance (2 databases deleted before)
According to Oracle Support Community this is likely due to a JDBC / Oracle JDBC driver issue; are you using an unusual Locale on your PC?  Is the ojdbc*.jar file on your PC that SQL*Developer is using the correct version for your database?