Why does Java SE 6 Web Start (javaws) not find the JRE with Apple's Java for OS X 2012-006 on Mountain Lion?
At About Java for OS X 2012-006 (article HT5493, modified 2012-10-16) Apple gives a related article:


Java for OS X 2012-006: How to re-enable the Apple-provided Java SE 6 applet plug-in and Web Start functionality (article HT5559, modified 2012-10-22).


Please run all four commands. The fourth should re-enable Java SE 6 Web Start.