gud-jdb-classpath

gud-jdb-classpath is a variable defined in `gud.el'.
Its value is

nil

Documentation:
Java/jdb classpath directories list.
If `gud-jdb-use-classpath' is non-nil, gud-jdb derives the `gud-jdb-classpath'
list automatically using the following methods in sequence
(with subsequent successful steps overriding the results of previous
steps):

1) Read the CLASSPATH environment variable,
2) Read any "-classpath" argument used to run jdb,
or detected in jdb output (e.g. if jdb is run by a script
that echoes the actual jdb command before starting jdb),
3) Send a "classpath" command to jdb and scan jdb output for
classpath information if jdb is invoked with an "-attach" (to
an already running VM) argument (This case typically does not
have a "-classpath" command line argument - that is provided
to the VM when it is started).

Note that method 3 cannot be used with oldjdb (or Java 1 jdb) since
those debuggers do not support the classpath command. Use 1) or 2).