After having update my Mac Os X, the java 6 have been removed and unfortunately Arduino request to use it. Personally I’m not really happy to install this not even more supported version of Java on my machine.
I was looking for the 1.5.8 Beta made for Java 7. I was not able to download it as the download stops in the middle even if I have a really good transfer rate at the beginning.
It seems that there is no mirror for Arduino (waouhou !! what that sh*t ?!?) and it seems this download problem is not really new. Here is the solution obtained from here. Use command line curl program:
curl -LOGC - http://arduino.cc/download.php?f=/arduino-1.5.8-macosx-java7.zip
The last step to be able to use it is to install Java from java.com