In the Breakpoint Commands section of the "jdb" man page it talks
about the "clear" command which is used while running jdb.
The "clear" command allows the user to clear a breakpoint as indicated
in the man page but is also will give a list of breakpoints that
the user has set which is *very* useful.

For example:
main[1] clear
Current breakpoints set:
        sun.tools.agent.Breakpoint:11
        sun.tools.agent.Breakpoint:15

As a user debugging a program this information is very useful and we
should make sure we document this in our man page for jdb.