1. Download the MacOS Runtime for Java.
2. Once the program has downloaded and unstuffed, click on the the MRJ 2.2.5 Install.smi icon on your desktop.
3. Click on the MRJ Install icon
4. In the folder that opens, Click on MRJ Installer and follow the instructions.
5. Once the MRJ is installed, feel free to throw away the MRJ related files that are on your desktop.