Editing The BlueJ Java IDE Launch Script Help

Was wondering if anyone could help me with editing the Java BlueJ IDE launch script on Linux. When I try to run the BlueJ application through Terminal, I get the message:

"A suitable JDK couldn't be located. 
You may need to edit the /usr/bin/bluej launch script. " 

I ran the BlueJ-XYZ.jar file, and selected my JDK (Java 7), which was just sitting on my desktop, and after the install, it gives this message.

I haven’t done this before, so I would appreciate the help if I could get it. I’m running Ubuntu.