Java 1.5 update 4 issues with Snow Leopard

CAfter Mac OS X Snow Leopard upgrade, I had to download Java 1.5 update 4 and got following error:

Java for Mac OS X 10.5 update 4 can't be installed on this disk. This software can only be installed on Mac OS X Leopard

Here is a solution:

1. Click on Finder -> Utilities -> Disk Utility 
2. Click on HD and run Repair HD Permissions
3. Restart you Mac and magic should start happening!

Also see:

Another way to fix this issue 

Java 1.5 update 4 download for Snow Leopard