I found the following trick somewhere, maybe it works for you :
When starting your JVM, use a line like
java -Dpid=$$ program.java
and in the java program using the statement System.getProperty("pid");
If it works, it's cute, and certainly a lot less overhead.
Credits : http://www.jguru.com/faq/view.jsp?EID=416212
(last one)
Leon Rosenberg wrote:
Hi,
I have a ugly issue I'm sure many people on this list already solved.
For multiple purposes I need pid's of processes, to stop/start them or
ensure they are running. So far nothing spectacular.
To obtain the pid I have following util:
String[] cmd = { "/bin/bash", "-c", "echo $PPID" };
p = Runtime.getRuntime().exec(cmd);
and afterwards read the ppid from the output stream of my process. So
far - so good.
The problem now occurs if a process has a lot of memory configured.
Like 25Gb on a 32Gb machine. In such a configuration the above command
fails with an OS'es out of memory, because fork
fails to create another process with THAT amount of memory:
1598388 2010-11-17 02:54:47,061 ERROR net.anotheria.util.PidTools -
Could not determine PID: java.io.IOException: Cannot run program
"/bin/bash": java.io.IOException: error=12, Cannot allocate memory
Is there another method to obtain the process id from within the process?
regards
Leon
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