MRJ 2.2.5 =Java (Mac OS Runtime For Java). 2.2.6
http://docs.info.apple.com/article.html?artnum=120209 is a fix for people using the Oracle database program.
http://docs.info.apple.com/article.html?artnum=75097 is the link you want for MRJ 2.2.5 .
If you find the folder Mac OS Runtime For Java on your HD, you should be able to tell if you're up-to-date. btw--running the Software Update control panel should also be done regularly.