Killing child kills Java parent

I have a Java process that is a child of the Solaris SMF and the Java starts it's own child process. When I kill Java's child then the Java process dies also. No standard output or error output. It just disappears and stops executing.
1: root@TestHost4:/ >ptree 9797
2: 7     /lib/svc/bin/svc.startd
3:   9797 java -jar <PathToJarFile> run
4:     10005 /opt/bin/perl -w <PathToPerlScript>
5: root@TestHost4:/ >kill 10005
6: root@TestHost4:/ >ptree 9797
7: root@TestHost4:/ >The perl script (line 4) is a child of the java app (line 3). When I kill the script (line 5) I end up also killing the java app (line 6)
How can I kill the child but not the parent?
I wrote the Java app myself and there is nothing in the logic that would cause all the threads to end or that would cause a call to System.exit except immediately after a logged message of the intention

If it it being killed then it wouldn't call System.exit() of course.There are 3 processes, SMF, Java and child. When the child is killed, the Java process dies
The child process is being created via Runtime.exec/ProcessBuilder right?Right
I think I have the answer in another thread
[http://forums.sun.com/thread.jspa?messageID=10567703&#10567703]

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Killing child process, not just the shell

Killing child process, not just the shell
#241 - 07/11/03 11:30 AM
Edit post Edit Reply to this post Reply Reply to this post Quote
Hi,
I am working on a system for automatically testing student submissions on an introductory course about unix scripting. The program works by running a test script on a student submission, using Runtime.getRuntime().exec(). The Process object has a limited life span of 10 seconds (by default), and if it is still running after these 10 seconds, Process.destroy() is used to kill it.
A bug exists when one of the submissions being tested times out. When the destroy() method is used it leaves a child process running... since students can also run
some tests from the file submission client, the number of hanging processes soon adds up as they test and test again to get it right before submission. Eventually this results in too many processes and the server keels over.
Does anyone have any ideas on killing these hanging processes?

Not much help, but I think this is a known bug ...
http://developer.java.sun.com/developer/bugParade/bugs/4770092.html

[Solved] Bash: killing child processes

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# This uses PIDs not names
# Also prints out a list of child pids that should be killed
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fi
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Last edited by some-guy94 (2010-01-13 22:48:39)

gradgrind wrote:You might like to try pkill / pgrep with the -g option?
Unfortunately that isn't what I'm looking for, I want this to work with multiple sessions(not that difficult), and also work with other apps on other tty's.
Currently what it does is it runs ps o ppid,pid,command x which gives a nice table
1234 5678 command1
1234 5679 command2
and if the ppid matches the session's pid, it's pid is saved, and (this part is looped) if it has child processes, then the function is run on the pid, afterward the pid is killed.
It works when I separate the function from the rest of the script, but when it is in a session it fails to work properly.
Last edited by some-guy94 (2010-01-05 23:11:57)

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