Using JDB on tomcat

[Thompson,Roger]

WHat is the best way to do this?
1) substitute jdb for java in the command shell
2) try to attach to a running instance
 
any pointers to experience in the email archive would be useful. 
I'm looking at http://mail-archives.apache.org/mod_mbox/tomcat-users/
but I don't see a way to search them -- just browse them.
 
Thanks,
Roger