Does anybody have any good java developer interview questions? I've got a couple people coming in for interviews beginning this afternoon and I have a basic set of "prove you have some clue" type questions that I have put together, but I'm still trying to flesh it out. The position is a mid-level (2-5 years relevant experience) java web developer. I'm looking for someone who has a solid understanding of j2ee development, but not so much knowledge that they will immediately outgrow the position. Any suggestions on lines of questioning are appreciated.

-Mike