Which java do I choose?

I've got java working with dos so I thought that may have helped make bluej work...I was wrong.
However I do still want it working even if my efforts are only half hearted now. I
My question:
On the launcher I have the choice of 2 javas:
c:\program files\java\jdk1.5.0_06
and
c:\sun\appserver\jdk
which should I be choosing?

OK.
That's the one I had....
Its working strange, not as much on the total crashes as I used to get (imagination?) but it is working weird. I can compile but then when I go to click on run it decompiles itself...

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