Killing any process ..Please Help

Question

Hi
This is the situation.
From my Python script I start a Java Process which starts rmiregistry at some port
Now I am interested in Killing the rmiregistry process .
So i start another Python script which runs another Java Program ....
BUT now i am not sure how to kill the process ?
THIS IS MY QUESTION
Basically 2 jvms are run . IN one jvm i have process handle.
BUT how do i kill process from different JVM
If this is not possible i would lilke to know how to the below
in java
1> HOW DO I KILL A PROCESS RUNNING AT SOME PORT (In general)
(Can be started frrom different JVM)
2> Also is it possible to get PID of process from Java

Answer 1

On Unix including Linux the command fuser tells which process listens on a port:
posman@linux:~> fuser -n tcp 1234
here: 1234
1234/tcp:            23153
posman@linux:~> ps -p 1234
  PID TTY          TIME CMD
posman@linux:~> ps -p  23153 -f
UID        PID  PPID  C STIME TTY          TIME CMD
posman   23153     1  0  2004 ?        00:00:01 java -Dfile=ZipServer.par -Dbeau
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