Java Thread monitoring. How to find out non daemon live threads?

Question

I see in JConsole that I still have 2 non daemon threads but I can't find out which exactly (total number of thread is beyond 30).
Visual VM doesn't provide such information.

Collettecolletti

Answer 1

Run:

$ jstack PID | grep tid= | grep -v daemon

This will dump all the thread of a given Java PID, filter lines with thread names and filter out non-daemon ones.

Remove -v to print daemon threads only.

Madson

unfortunately leaves a few odd threads in there, like GC threads, but close enough! :) – Albie

A tip for future readers: you can find jstack in your JDK's bin folder – Irremediable

Answer 2

Take a thread dump in VisualVM. Daemon threads have the word 'daemon' next to the thread name.

"Default RequestProcessor" daemon prio=1 tid=101e58000 nid=0x124d86000 runnable [124d85000]

Brig

i dont see this in visualvm 1.33 on linux. which window do you refer to? – Ohmage