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Did you create the database, or did it already exist?
The default system password is manager, but you are normally asked to specifiy a password when creating the database.
If someone else created the database, you will have to ask them for the password.
I figured out that I need an oracle database connection created before I can add a new connection in SQL Developer.
Do I just download Oracle 11g? And add tables etc..?
I'm curious how you managed to get a database error message (Invalid username or password) if you haven't got a database.
Download 11g Express edition.