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Network Security Secure-Shell
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Re: Question on SSH hang on exit when running Java background process

from [Greg Wooledge] Network Security [Permanent Link]
Subject: Re: Question on SSH hang on exit when running Java background process
Date: Mon, 30 Apr 2007 08:24:50 -0400 
On Fri, Apr 27, 2007 at 10:25:44PM +0800, YU Jiazi wrote:

My problem is that my SSH client hang on "exit" if I run a java program 
as a background process.


This will hang:

   ssh somewhere 'sleep 1000 &'

This will not hang:

  ssh somewhere 'sleep 1000 >/dev/null 2>&1 &'

Make sure your program does NOT leave open file descriptors attached to
the terminal, and you should be fine.


then I save it as Test.java,  and compile, run it as follow in a 
terminal connected by ssh(my ssh client is putty 0.58):

javac Test.java
java -cp . Test &
exit

then putty hang, it seems that the SSH connection is still alive and 
waiting for the java program to exit.


Do this instead:

  java -cp . Test >/dev/null 2>&1 &
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