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From "Mark Ford (JIRA)" <>
Subject [jira] [Created] (NET-592) plainSocket in FTPSClient is never closed
Date Sun, 29 May 2016 19:13:12 GMT
Mark Ford created NET-592:

             Summary: plainSocket in FTPSClient is never closed
                 Key: NET-592
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 3.4, 3.5
            Reporter: Mark Ford
            Priority: Critical

The plainSocket field in the FTPSClient is never closed. Over time, this will lead to an IOException
with "too many open files".

To recreate this, try the following in a loop:

- create an FTPSClient
- call the login
- upload a file
- download the file
- disconnect within a finally block

I would expect the disconnect call would release all of the file descriptors but if you set
a breakpoint you'll notice that this socket remains open.

In my test driver, this eventually fails after 8,000 iterations until it hits the max file
descriptors for the test process. 

If I use some reflection code and force FTPSClient.plainSocket to be accessible so I can close
it, then everything works. 

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