Re: [JSch-users] JSCH .53 return empty strings executing commands on ubuntu

[Tobia C. <tob...@gr...>]

What exactly are you doing after channel.connect()?
Do you have any try/catch, read-write loops, and such?
Can you post the rest of the code until channel.disconnect()?

Tobia


> On 18 May 2016, at 10:04, Offer Baruch <off...@gm...> wrote:
> 
> can someone confirm you can actually see this?
> i would like to add some more data to this issue.
> this is the way i configure my channel:
>             Channel channel = session.openChannel("exec");
>             ((ChannelExec) channel).setPty(true);
>             ((ChannelExec) channel).setPtyType("dumb");
>             ((ChannelExec) channel).setCommand(command);
>             connOut = channel.getOutputStream();
>             connIn = channel.getInputStream();
>             connErr = ((ChannelExec) channel).getErrStream();
>             channel.connect();
> when i mark the setPty to false everything works fine...
> when it is true i get the random error...
> i tries different terminal types but that did not solve anything...
> 
> please i really need some help here...
> 
> thanks
> Offer Baruch
> 
> On Tue, May 17, 2016 at 10:10 AM, Offer Baruch <off...@gm... <mailto:off...@gm...>> wrote:
> Hello
> 
> I am new to the list but using JSCH for a long time accessing redhat and sles...
> Lately i started using it to access ubuntu but i am having a very strange issue.
> The code i am using is shared for all distors and versions but specifically on ubuntu every once in about 100 commands i issue (in average) i get back an empty string.
> No exceptions, input stream simply reaches EOF.
> I was able to recreate the issue running the same command 400 times. Specifically "echo offer".
> In average 4 times will return an empty string. In the real world this happen randomly on a different command each time.
> It only happens with ubuntu (i am using 16.04).
> I am using an exec session to run my commands with jsch .53.
> Does this ring a bell to anyone?
> How can i proceed to solve or get around this problem? is there any debug options i can use?
> I am not able to reproduce without jsch... i tried simple ssh with a single command.
> 
> Can someone point me in the right direction?
> 
> Thanks on advance
> Offer Baruch