[jira] [Created] (NET-592) plainSocket in FTPSClient is never closed

["Mark Ford (JIRA)" <ji...@apache.org>]

Mark Ford created NET-592:
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             Summary: plainSocket in FTPSClient is never closed
                 Key: NET-592
                 URL: https://issues.apache.org/jira/browse/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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