Problem compiling Java with C-c C-v C-c

[George Rudolph]

I have just installed Emacs 20.6 and JDE 2.1.5 ( I was previously using
20.3.1 and JDE 2.1.1.)

The Java compile option appears to be broke, or set incorrectly.  When I
load a Java file,
and compile it, I get the following error:

"Wrong type argument: listp, t"

I have looked through the jde compile options and I don't *see* anything
that looks like it's
improperly set, but certainly something is.
What option have I missed?  Which arg is this referring to?