Oracle Java 7 no Mac OS X Lion e Eclipse

Download do java na oracle: link
Instale o Java 7 (dmg)
No Eclipse, va em Preferences, Java, Installed JREs, Add..., Standard VM, em JRE Home coloque "/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home", em JRE Name coloque "JDK1.7", clique finish e pronto.