The Apple website basically says: "install the OS over again". I'm hoping there is something I can do other than that.
I'm testing a Java app that has known problems with JRE 1.6.0_18 and above. Somewhere along the line I accepted an OS update that installed JRE 1.6.0_20. I really want to drop back to 1.6.0_17 which was working well in this environment a few months ago.
I'm running an up-to-date Snow Leopard (10.6.4).