Thrameos opened a new issue, #313:
URL: https://github.com/apache/mina-sshd/issues/313
### Version
2.9.3
### Bug description
While trying to implement a virtual file system for SFTPD, I ran into a
condition in which the connection would close but there was nothing in the
logs. After 5 hours of trying to configure the logger all I could see is
DEBUG messages, but no log of the exception or error. I eventually traced it
down that although there is a master catch in SftpSubsystem.run, it was never
being reached. It appears that AbstractSftpSubsystemHelper contains a lot of
code with this sort of pattern...
```
} catch (IOException | RuntimeException e) {
sendStatus(prepareReply(buffer), id, e,
SftpConstants.SSH_FXP_OPEN, path);
return;
}
```
It seems like poor practice to not log something when an exception occurs.
To reproduce this I implemented a custom FileSystemFactory which returned
MyFileSystem in which getSeparator() throw an exception. To hit multiple
points I had to proxy Path, FileSystem, and FileSystemProvider to the normal
versions. The exception must happen in the Path, FileSystem, or
FileSystemProvider. Throws in FileSystemFactory are caught properly as
SftpSubsystem catches during prepare, but not in doProcess.
### Actual behavior
Nothing was logged.
### Expected behavior
A log message with the source of the exception. If this is addressed,
perhaps this should be logged at the DEBUG level as this was not normally
logged in the past. After all there are a lot of tolerable exceptions
(missing file, permissions, etc) that are not errors for normal operation.
### Relevant log output
_No response_
### Other information
Logging was configured with log4j with DEBUG to console. But the lack of
output is programmatic rather than the logger, so it should be universal.
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