Re: [JSch-users] Session hang when connected with openSSH

[Lothar K. <jo...@ki...>]

Am 18.06.2014 15:17, schrieb aarthit 2014:
>  InputStream io1 = System.in;
>  byte[] buf = new byte[32768];
>  int i = -1;
>  
>  try {
> * _i=io1.read(buf, 0, 32768);_
> *
>  String str = new String(buf);
>  System.out.println ("I read " + buf + "as string" + str);
>  }
> catch (Exception e)
> {
>   System.out.println("Excecption received" + e );
> }  
> }
> }
> 
> 
> In this program when we change the value of the third parameter
>  of the read call to value greater than 26608 we get the following
> exception when run in windows XP with java version 1.6.0_22
> *
> java.io.IOException: Not enough storage is available to process this command
> *
> 
> But the same program is working fine when it is run in windows 7
> machine with same JRE version  even if we increase the values upto 32767.

The error-message comes from the operating system and has nothing to
do with Java/JSCH. See e.g.
http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/not-enough-storage-is-available-to-process-this/9624b57d-ea4c-41fa-aae0-b52e99b69fab
That's the first Google-Hit covering that error-message. As you
can see, the error can also occur on later versions of Windows
and I've seen this kind of error on other operating systems as
well (e.g. with a JVM on a BS2000-system - don't ask ;-)

The way you read in the data is not good practice anyway and can
lead to problems on Windows 7 as well, e.g. if not all data
resides in one TCP-packet and the seconds arrives delayed. A better
approach for that e.g. is

byte[] buf = new byte[maxLength]
int read;
int offset = 0;

while (offset < buf.length && (read = io1.read(buf, offset, Math.min(4096, buf.length - offset)) != -1){
  offset += read;
}


Cheers, Lothar