Attempt to copy a file via FTP will cause temporary lockup and create 0 byte file
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                 Key: VFS-176
                 URL: https://issues.apache.org/jira/browse/VFS-176
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 1.0
         Environment: FtpFileSystem
            Reporter: Andrew Franklin
            Priority: Minor


The following exception occurred when I tried transferring a file via ftp that the user did not have read access to. (ie, it has been chmod 400 to another user).

Commons-vfs will create a 0 byte file in the destination folder, but that file never grows. Also, no messages are logged at
this time. So it appears to the user that the transfer has frozen, until the exception is thrown.

I suspect the problem is in commons-net.

Note: this exception is not thrown immediately. It takes a few minutes before this fires.

Caused by: org.apache.commons.vfs.FileSystemException: Could not copy "ftp://anonymous:password@server/pub/20070727.txt" to "file:///tmp/2007/10/20071011/pub/20070727.txt".
        at org.apache.commons.vfs.provider.AbstractFileObject.copyFrom(AbstractFileObject.java:933)
        at com.company.FileObjectUtil.copyFile(FileObjectUtil.java:260)
        at com.company.vfs.VfsFileMirror.copyNewFile(VfsFileMirror.java:495)
        ... 7 more
Caused by: org.apache.commons.vfs.FileSystemException: Could not close the input stream for file "ftp://anonymous:password@server/pub/20070727.txt".
        at org.apache.commons.vfs.provider.DefaultFileContent$FileContentInputStream.close(DefaultFileContent.java:565)
        at org.apache.commons.vfs.FileUtil.writeContent(FileUtil.java:87)
        at org.apache.commons.vfs.FileUtil.copyContent(FileUtil.java:103)
        at org.apache.commons.vfs.provider.AbstractFileObject.copyFrom(AbstractFileObject.java:924)
        ... 9 more
Caused by: org.apache.commons.net.ftp.FTPConnectionClosedException: FTP response 421 received.  Server closed connection.
        at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:321)
        at org.apache.commons.net.ftp.FTP.getReply(FTP.java:605)
        at org.apache.commons.net.ftp.FTPClient.completePendingCommand(FTPClient.java:1253)
        at org.apache.commons.vfs.provider.ftp.FTPClientWrapper.completePendingCommand(FTPClientWrapper.java:177)
        at org.apache.commons.vfs.provider.ftp.FtpFileObject$FtpInputStream.onClose(FtpFileObject.java:594)
        at org.apache.commons.vfs.util.MonitorInputStream.close(MonitorInputStream.java:125)
        at java.io.BufferedInputStream.close(BufferedInputStream.java:440)
        at org.apache.commons.vfs.util.MonitorInputStream.close(MonitorInputStream.java:115)
        at org.apache.commons.vfs.provider.DefaultFileContent$FileContentInputStream.close(DefaultFileContent.java:561)
        ... 12 more

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