process completed

hi there
          I am executing an unix process from my servlet using process class.
After
          user hits the submit button this process starts. The process take
about 30
          to 60 minutes to get completed depening on user data. I want to
display
          "Your job is accepted and it running" when user clicks submit
button,
          whereas process is also running. When the process is completed the
page
          should automatically display that job is completed. I dont know how
to keep
          track of process and know when it is completed. Also if i use wait
for
          method of process class then it wont display"Your job is accepted
and it
          running" but wait for process to get over and then display it.
          Any help in this matter would be helpful.
          Bye
          Dinesh

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