I'm in dire straights. I was trying to replace my java JDK and downgrade to 1.6 and somehow managed to completely screw up all the previous versions in the process. Bottom line, my Mac has no JDK installed at all. I've tried reinstalling java 1.7 from Oracle, I've tried using Pacifist to manually extract the files from the 1.6 Apple Java... nothing. When I open terminal and use java -version all I get is -bash: java: command not found My real goal is just to get back to java 1.7, but even after running the installer, java is still inaccessible to terminal and other applications.