Apple blocked the Java 6 and Java 7 plug-ins for the third time this year over Mac users on Thursday over more potential security threats. Mac users running versions of Java that are earlier than version 6 update 51 and version 7 update 25 can no longer run Java code on their computer until they update to a newer version.
Apple disables Java for Macs for the third time this year
Apple hasn't uninstalled Java from user's Macs, and instead has simply disabled the older versions of the plug-in, which means apps and websites that rely on Java either won't work or will be partially non-functional. Users running newer versions of the plug-ins aren't affected.
This isn't the first time this year Apple has remotely disabled older versions of Java over security-related issues. For Mac owners that don't actually need Java, you can uninstall it, or at least find out exactly which version is living on your Mac, by following along with TMO's handy guide.
Apple has taken to remotely disabling older versions of Java on user's Macs, and will also auto-disable the plug-in when it hasn't been used for at least 30 days. You can also disable Java yourself in Safari's preferences.
Apple has stopped maintaining Java on its own and has handed that task off to Oracle, which also happens to be the company that develops the Java platform. Assuming you need Java on your Mac, you can find the latest version at Oracle's Java website.