"Could not determine containing class"

[Yoon Kyung Koo]

I'm using JDE 2.1.8 with GNU emacs/NT 20.7.
I've used JDE 2.1.6beta16 which worked fine when I debugging JDK 1.1.8.
But after I upgraded to higher than 2.1.6beta16, I cannot add breaks on
source codes.
The error message is "Could not determine containing class".
How can I solve this problem?

I have another problem too.
I have several classes names of which are ends with '_', and I cannot
let debugger load the source codes correctly. This problem also occurs
with older versions.

Thanks in advance...