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.

score 22 · Accepted Answer · answered Dec 16 '11 at 16:26

22

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.

answered Dec 16 '11 at 16:26

Tomasz Nurkiewicz

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unfortunately leaves a few odd threads in there, like GC threads, but close enough! :) – rogerdpack Jul 12 '13 at 17:21
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A tip for future readers: you can find jstack in your JDK's bin folder – Dana Cartwright Jul 20 '17 at 19:05

score 2 · Answer 2 · edited Dec 17 '11 at 15:29

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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]

edited Dec 17 '11 at 15:29

Tomasz Nurkiewicz

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answered Dec 17 '11 at 15:19

Tomas Hurka

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i dont see this in visualvm 1.33 on linux. which window do you refer to? – Tom Mar 10 '12 at 18:39

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

2 Answers2