channel does not close after executing long running command

[yunmengmeng]

execChannel.setCommand(cmd);
execChannel.connect(timeOut);
while (!execChannel.isClosed()) {
    TimeUnit.MILLISECONDS.sleep(100);
}

I used to running cp xxx xxx,the file size is 13G,it takes serveral minutes to finish.but sometimes execChannel.isClosed() always return false and execChannel.getExitStatus() always return -1. So this code can't break out the loop.but on the server, cp process is finish and the server doesn't have this process.
So i guess it may because of long command, or channel doesn't receive end message from the server. But not happens every time.
Jsch version is 0.1.55.How to fix it?

[yunmengmeng]

it happend again when executing sleep 1800

[norrisjeremy]

Hi @yunmengmeng,

JSch 0.1.55 is a very old version that was published well before this fork of the project was created.
Have you attempted to use our most recent release (0.2.21) to confirm whether this problem still occurs?

Thanks,
Jeremy