> dataSource.setDatabase
> ("jdbc:firebirdsql://localhost/3050:D:/Javadev/Databases/MURATEST.GDB");

If you check examples more carefully you will see that database must be

dataSource.setDatabase(
"localhost/3050:D:/Javadev/Databases/MURATEST.GDB");

Also note, there's two possibilities to specify JDBC URL:

jdbc:firebirdsql://host:port/drive:/path/to/the/database.gdb

or

jdbc.firebirdsql:host/port:drive:/path/to/the/database.gdb

Best regards,
Roman Rokytskyy