On 12/28/2009 12:12 AM, matsuda wrote:
> Hi,
>
> I have a trouble using (SSH)Exec problem.
> It is that "channel object" sometimes fails to detect the close signal.
> Can anyone help me?
>
> While program does polling a remote SSH server by "ls" command,
> "if(channel.isClosed())" sometimes doesn't change true forever!
>
> According to my experience, it occurs after running some nights or
> more than 1000 times loop.
>
> For debug, I add below test message, then it appears.
> It shows exit status code changed( from -1 to 0 ),
> but channel hasn't closed.
> if( !channel.isClosed()&& channel.getExitStatus() == 0 ){
> System.out.println("before close exit-status changed!" );
> }
>
>
> Q1. Is is a known problem?
>
> Q2. How should I write program to recover this problem?
These are very good questions. I have encountered both recently myself.
I also can attest that disconnects I know to exist were not reported
by my running application, so either I misunderstand the semantics of
Channel.isClosed() and/or Channel.isConnected() or in fact there is a
bug in this part of the JSch library.
In the course of writing some test code to determine what the actual
behavior is (as opposed to what it should be --- there is no spec at
this level as far as I can determine) the question arose in my mind:
can a Channel object be opened, connected, disconnected and closed
multiple times within a single Session object? I will follow up with my
experimental results soon.
Thanks,
-pmr
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