Userfriendly debugger?

For Java?

I'm teaching an AP class but they are still kids (~14 years old). No jdb won't do. I want something very simple. Something that doesn't consume time learn.

Something that basically prints a continuously updated trace table, with all the variables, their values and their details.

>>1
Learning how to appease the Java debugger gods is a rite of passage, how you distinguish the good crap programmers from the bad crap programmers.