[JSch-users] Exception in ChannelSession

[Bernd <be...@pr...>]

Hi,

sometimes, my application gets a exception in 
om.jcraft.jsch.ChannelSession.run Line 81.

The line in question looks harmless to me:

if(thread!=null){
      synchronized(thread){ thread.notifyAll(); }
}

I use blackdown-jdk-1.4.2.03 on Linux 2.6.15
on a 64Bit-Athlon machine running Gentoo.
I tried jsch-0.1.28 and jsch-0.1.26.

Maybe I do something wrong. I wrote a Wrapper 
around jsch, the execute function is:

	public ExecResult execute(String command) 
                      throws JSchException, IOException {
		int channelResult = -99;

		Channel channel = session.openChannel("exec");
		((ChannelExec) channel).setCommand(command);
		channel.setInputStream(null);

		((ChannelExec) channel).setErrStream(System.err);

		InputStream in = channel.getInputStream();

		ByteArrayOutputStream errOut = new ByteArrayOutputStream();
		ByteArrayOutputStream sysOut = new ByteArrayOutputStream();
		channel.setOutputStream(sysOut);
		((ChannelExec) channel).setErrStream(errOut);

		channel.connect();

		while (true) {
			if (channel.isClosed()) {
				channelResult = channel.getExitStatus();
				break;
			}
			try {
				Thread.sleep(50);
			} catch (Exception ee) {
			}
		}
		channel.disconnect();
		return 
                   new ExecResult(
                           channelResult, 
                           sysOut.toString(), 
                           errOut.toString());
	}


If I run a test like the one below, I get
about 10 exeptions:


public static void main(String[] arg) {
	
		String sshhost="netwar";
		String sshuser="root";
		String sshpassword="0987";
		SSHExec sshExec ;
		try {
			long l= System.currentTimeMillis();
			sshExec = new SSHExec(sshhost,sshuser,sshpassword);
			System.out.println("got ssh after "+(System.currentTimeMillis()-l));
			System.out.println("Connected to "+sshhost+" as "+sshuser);
			l= System.currentTimeMillis();
			
			for (int i=0;i<1000;i++) {
				ExecResult er = sshExec.execute("pwd");
				System.out.println(i+" "+er.getResultCode()+" "+er.getSysOut());
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}
}	


Thanks in advance,
Bernd