Stuff At Work

This is for people who have faced that problem when using myeclipse. Well, I'm going to give you a tip.

"the jarfile rt.jar has no source attachment" is not part of the actual error. An exception is being thrown in your programme. Eclipse is trying to show you the source code of error, But it cant find the code of relevant classes (it is possible)
Eclipse is telling you it can't provide this help. This is a seperate matter
from the actual exception itself.

So , pay your attention to more important area without worring about this. I'm telling you this from my experience :)

more info :
http://www.velocityreviews.com/forums/t151773-need-help-the-jarfile-jsr173_api-jar-has-no-source-attachment.html