Need a desktop or Unity launcher for jDeveloper? That's pretty easy...
Create a txt file in your home directory with the following content
Exec=<Full path of your Oracle Jdeveloper Home>/jdeveloper/jdev/bin/jdev
Icon=<Full path of your Oracle Jdeveloper Home>/jdeveloper/jdev/bin/jdev_icon.gif
Copy it to ~/.local/share/applications/jDeveloper.desktop, e.g:
cp jDeveloper.txt ~/.local/share/applications/jDeveloper.desktop
In Nautilus go to the ~/.local/share/applications/ directory and drag the file to your Unity bar on the left. You can also drag it to your desktop. (.local is a hidden directory, display it with ctrl + h)
If you only want a desktop shortcut you can copy the .txt file directly to your desktop.
cp jDeveloper.txt ~/Desktop/jDeveloper.desktop