ThreadGroup active count really high for my servlet, why?

Posted on 2006-06-28
Medium Priority
Last Modified: 2013-11-24
I've got a section of code:

ThreadGroup tg = Thread.currentThread().getThreadGroup();

When I get a sys out for this when my class is running as a service, in the main() method, it returns 1 or 2, as it should.

When I run the SAME CODE except now it's running as a servlet called from the init method it's returning 35, sometimes 40!!  It's different everytime.

Question by:arctanx
LVL 92

Expert Comment

ID: 17005754
container will create new thread to handle requests, and it may also be using a thread pool.
LVL 23

Expert Comment

ID: 17006356
Tomcat (or any other web container) uses threadpool to handle requests of the client. These threads belongs to same threadgroup which is different from main threadgroup.
LVL 36

Accepted Solution

girionis earned 300 total points
ID: 17007635
Most (if not all) of the containers use a thread pool. for more info have a look here: http://www.javaworld.com/javaworld/jw-06-2004/jw-0628-performance-p2.html

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