Upgrading to Mac OS Lion as Developer-Collection of common programming errors

xCode requires a full download (the full 5*ish GB) and if you are a Java guy you will have to re download Java as it is not included (this was my experience when opening eclipse for the first time in Lion).

Some of Snow leopards apps are compatible, not all (ppc apps will not work). It is probably best to check with the software vendor first.

Another thing your Library folder disappears on an upgrade among some others where Lion is trying to ‘Protect’ its users. To get round this simply enter the command into terminal. (replace username with your username and foldertoreveal with the hidden foldername)

chflags nohidden /Users/Username/FolderToReveal 

The upgrade process other wise has been fine. For reference I am an Obj C /C++ /C and Java developer. Hope this helps

Also will link you to this post about Developing Java on Lion: Stack Overflow post on Java in Lion