[jBoss-User] Starting and stopping jboss automatically in *nix

[VASQUEZ_JASON]

Let me preface this by saying that this is a horrible hack--it seems to work for me today, but if you're interested, try it out and let me know...

This is NOT 100% pure java.  (there's a 4 line C program--ick!)

I have done some research, and it doesn't appear that there is anyway to get the current process id from within java any other way.  If anybody knows otherwise, let me know -- it will make this a lot simpler.

The solution consists of 3 parts:
     a 4-line C program
     a couple of mods to org.jboss.Main
     some mods to run.sh and a new shutdown.sh and setvars.sh

The source for the C program is as follows:
int main() {
  printf("%i", getppid());
  return 0;
}

All this does is print out the process id of the process calling it (the parent process).  Compile this, and put it in JBOSS_HOME/bin with the name 'getppid'

in org.jboss.Main, add this to the beginning of the constructor:
        Runtime r = Runtime.getRuntime();
        Process p = r.exec(System.getProperty("jboss.home") + "/bin/getppid");
        BufferedReader bin = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line = bin.readLine();
        int pid = Integer.parseInt(line);
        PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(System.getProperty("jboss.home") + "/tmp/jboss.pid")));
        out.print(pid);

          in.close();
        out.close();

        r = null;
        line = null;


You'll also need to add an import for java.io.BufferedWriter to Main.java
This calls our C program from above, and writes the output to a file in JBOSS_HOME/tmp/jboss.pid


Next, create a file in JBOSS_HOME/bin called setvars.sh. Currently it consists of this:
#!/bin/sh

JBOSS_HOME=/opt/jboss
export JBOSS_HOME

Be sure to make it executable (chmod +x setvars.sh), and change to the actual location of your JBOSS_HOME.

Add this near the top of run.sh:
. ./setvars.sh

Edit the last line of run.sh (where the java vm is launched) to include a '-Djboss.home=$JBOSS_HOME'  (put it somewhere around the tomcat.home var)

Create a new file called shutdown.sh, executable with these contents:
#!/bin/sh

. ./setvars.sh

getpid() {
  pid=`cat $JBOSS_HOME/tmp/jboss.pid`
  echo $pid
  return 0
}

thispid=`getpid`
kill $thispid


This seems to do the trick.   There's some obvious room for improvement here and there.... (such as cleaning up the .pid file, etc.)  I have no idea if this will work under Windows or not (I don't have a C compiler for windows)--anybody care to comment?

It should now be trivial to set up start and stop scripts for your system that just call run.sh and shutdown.sh....

-Jason