[SOLVED] Which is the java application pid?

newbie14 · 05-11-2012, 01:39 AM

Dear All,
I got a java application where I run it as a daemon using this yajsw tool. So when I run this command I get as below. Now I would like to know what is 3109 and 3132 is pointing to?

Code:

ps -ef | grep java

root      3109     1  0 Apr06 ?        00:04:35 /usr/java/jdk1.6.0_18/bin/java -Dwrapper.pidfile=/var/run/wrapper.commServer.pid -Dwrapper.service=true -Dwrapper.visible=false -jar /usr/local/yajsw-beta-10.2/wrapper.jar -c /usr/local/yajsw-beta-10.2/conf/wrapper.conf
root      3132  3109  0 Apr06 ?        00:25:26 /usr/java/jdk1.6.0_18/bin/java -classpath /usr/local/yajsw-beta-10.2/./wrapperApp.jar:/usr/local -Xrs -Dwrapper.service=true -Dwrapper.console.visible=false -Dwrapper.visible=false -Dwrapper.pidfile=/var/run/wrapper.commServer.pid -Dwrapper.config=/usr/local/yajsw-beta-10.2/conf/wrapper.conf -Dwrapper.port=15003 -Dwrapper.key=4276015160565963367 -Dwrapper.teeName=4276015160565963367$1333699547154 -Dwrapper.tmpPath=/tmp org.rzo.yajsw.app.WrapperJVMMain
root     23986 23945  0 16:53 pts/0    00:00:00 grep java

pidof java
3132 3109

EricTRA · 05-11-2012, 01:51 AM

Hi,

The first number is the process ID (PID) and the second one the parent process ID (PPID). So when you started '3109' (apparently a wrapper) it got started by the init process (PPID 1) and launched a child process with ID 3112. The second process has the first one as parent.

Kind regards,

Eric

em31amit · 05-11-2012, 01:53 AM

i guess, 3109 is process of java, which parent process is (INIT) PID is 1. and 3132 is a child process of java PID 3109.

newbie14 · 05-11-2012, 01:58 AM

Dear Eric,
What is the reason to have two pid actually? So If I would setup a monit to monitor my java process what do you suggest then which pid to take on ?

EricTRA · 05-11-2012, 02:17 AM

Hi,

I'm not much into Java but here's some explanation on Java wrappers and why they're used. On the other hand you can also have TCP wrappers, which are explained a bit on this page. Hope this clears it up a bit.

Kind regards,

Eric

newbie14 · 05-11-2012, 03:36 AM

Dear Eric,
In order to find out the status of the my java app which pid should I focus the parent or child? Thank you.

em31amit · 05-11-2012, 04:48 AM

i guess, it is normal behavior of the process , like if a running process start a new child process than that running process become parent process of child process. child and parent concepts are most common into thread process and also JAVA is multi-thread process.

newbie14 · 05-11-2012, 09:55 AM

Dear Amit,
Thank you I will look into for further details.