Question

how do I have to modify the following ruby script to make it work? (I’m on Linux.)

# 1. Launch a java server:
system "java -jar myJavaServer.jar -someArgument -otherArgument"

# 2. Execute some ruby code (with the server running):
[...]

# 3. Stop the java server:
system "killall java"

I suppose the java server must be launched into a separate ruby thread so the following code gets executed with the server running…?

Thanks a lot for your help!

Tom

Answer 1

Use fork() to run the java server in one process and your ruby code in the other.

pid = fork()
if pid then
    # This is the parent process. Execute your ruby code here
    # then kill the process running the java server
    system "kill #{pid}"
else
    # this is the child process, run the java server here
    system "java -jar myJavaServer.jar -someArgument -otherArgument"
end