hsynsvndk opened a new issue, #763:
URL: https://github.com/apache/mina-sshd/issues/763

   ### Version
   
   2.12.1
   
   ### Bug description
   
   Hi everyone,
   
   I'm currently using sshd-core version 2.12.1 in a Maven-based Java project.
   I wanted to upgrade to a more recent version (e.g., 2.15.0), but 
unfortunately, I encountered a critical issue when downloading large files via 
SFTP.
   
   When I attempt to download a large file using SftpInputStreamAsync, I 
receive the following exception:
   
   `
   java.lang.NullPointerException: Cannot invoke 
"org.apache.sshd.common.util.buffer.Buffer.available()" because "this.buffer" 
is null
        at 
org.apache.sshd.sftp.client.impl.SftpInputStreamAsync.sendRequests(SftpInputStreamAsync.java:245)
        at 
org.apache.sshd.sftp.client.impl.SftpInputStreamAsync.doRead(SftpInputStreamAsync.java:195)
        at 
org.apache.sshd.sftp.client.impl.SftpInputStreamAsync.transferTo(SftpInputStreamAsync.java:152)
   `
   
   This behavior does not occur in version 2.12.1, so I suspect it's a 
regression introduced in 2.13.1 or later.
   
   - Is this a known issue?
   - Is there a recommended workaround for downloading large files with newer 
versions?
   
   Thanks a lot for your support and for maintaining this project!
   
   ### Actual behavior
   
   .
   
   ### Expected behavior
   
   .
   
   ### Relevant log output
   
   ```Shell
   
   ```
   
   ### Other information
   
   _No response_


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