[mwildam]

I have noticed that there are significant new things in the version 6 eg the tray notification icons.

I also go with 6 for my early tests (I must say that I have no living Java project so far because very new to java).

But I noticed that eg most linux distributions still have the 5 installed by default and installing the version 6 needs some manual work.

So if you want to make sure that your app runs anywhere still running an older Java version then the 5 might be your choice. But regarding new features and libraries the 6 might be the one to prefer.