Can one java process fetch ids of other java processes running on the same host?

Question

Is there a way to find which jvms are currently running, and get their PIDs? e.g. when launching JVisualvm, it shows all local jvms. How can I do that?

Background: I'm working on an instrumentation project, and I would like to attach an agent to another (unknown) java process. The idea is to display all currently running java processes, and let the user choose a process from that list. Thanks!

[edit] I do mean processes, not threads.

I think its NOT. Since OP wants to have list of processes currently running instead if threads in JVM. — Ved, Sep 06 '12 at 12:37
wouldnt it be better to let both communicate using sockets or pipes for example? — CloudyMarble, Sep 06 '12 at 12:35
You could use [jps](http://docs.oracle.com/javase/1.5.0/docs/tooldocs/share/jps.html). It comes with the JDK. — Dave, Sep 06 '12 at 12:35
You might need to use Runtime.exec() to run an external(OS) command for listing all the PID and probably filtering them. For doing that you can look at [this](http://www.ensta-paristech.fr/~diam/java/online/io/javazine.html). Would that work I'm not sure and it will depend what kind of information you can get from the PID listing. — Alex Botev, Sep 06 '12 at 12:37

score 1 · Accepted Answer · answered Sep 06 '12 at 12:35

1

You can use Runtime for that. This should give you a way ahead to proceed with.

Process p = Runtime.getRuntime().exec(COMMAND_TO_GET_PROCESS_DATA);

Ref

answered Sep 06 '12 at 12:35

Ved

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thanks. got any idea about "COMMAND_TO_GET_PROCESS_DATA" you've mentioned? I want it to run on windows. – iGili Sep 09 '12 at 07:34
Not sure, but `tasklist` can do the trick. – Ved Sep 10 '12 at 05:20
Did this resolved your issue ? – Ved Sep 10 '12 at 12:39
not entirely. I have some running processes that does not appear in tasklist, but I admit I didn't try hard enough... – iGili Sep 11 '12 at 10:57
hmm may be but you need to login thru admin to see all process – Ved Sep 11 '12 at 11:22
1

took me a year to go back to that old project, and this solution is solid enough. Thanks! – iGili Nov 14 '13 at 10:53

Can one java process fetch ids of other java processes running on the same host?

1 Answers1