On 10/16/12 Apple released a software update named Java for OS X 2012-006. It will show as available on Macs running OS X 10.7 and 10.8.

This update uninstalls the Apple provided Java applet plug-in from all web browsers. This means if you had previously been going to a website that used a Java applet, after applying this update the applets will not work. Instead you will get a “Missing plug-in” box, with a link to download the latest version of Java from Oracle.

Apple deprecated their Java plug-in on 10/16/10, and two years to the date they apparently are now uninstalling it. This change was done to shift the responsibility for patching Java vulnerabilities onto Oracle, instead of having to maintain their own Java plug-in internally.

Oracle’s Java applet plug-in is not the same as Apple’s. It will only run in 64-bit mode, and has been reported to be incompatible with dozens of web based products that rely on running Java applets.

If your workflow or daily routine relies on running Java applet based software from within a web browser, do not install the Java for OS X 2012-006 unless you have first verify it’s compatible. All Covered Chicago will not be pushing this update out to Macs under contract due to it’s potential to break things.