Why suddenly all these Java error messages since upgrading to Lion?

Since I upgraded to OSX 10.8.2, suddenly I'm having no end of error messages having to do with Java not running—everything from coupon printer plug-in to online games not functioning anymore. All of these worked fine in 10.7.4. Is there a fix?

Since it is such a seething whole of exploits, Apple has disabled Java by default, both the JRE and the Web Applet launcher in Safari.
If you try to run a Java application, it will ask if you want to install it.
If you're just using web applets, you won't get asked. So, open Java Preferences which is in the /Applications/Utilities folder. It will ask if you want to install Java.
Then, open Safari preferences, Security tab, and enable Java.

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