deadlock problem

[Brian Moseley]

while running a very simple test against my caldav server (client 
program spawns 10 threads, each of which does a single PUT request), i 
ran into what looks like a deadlock issue. all of the requests time out 
without receiving any bytes.

the thread dump is at <http://people.apache.org/~bcm/deadlock.txt>. 
there are in fact 10 http threads waiting to lock or waiting on what 
appear to be 3 different locks.

i have never had to debug a deadlock problem, so first i want to make 
sure that i'm diagnosing it properly :) if so, what's the next step? 
what's the best way to figure out what's going on?

thanks!