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From "Konrad Garus (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-476) FTP parser initialization from invalid line
Date Tue, 24 Jul 2012 08:30:33 GMT

    [ https://issues.apache.org/jira/browse/NET-476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421264#comment-13421264
] 

Konrad Garus commented on NET-476:
----------------------------------

While this may look like errors of unsafe, concurrent access on our side, I don't think that's
possible. We're always using the same connection bound to ThreadLocal via an ExecutorService.
                
> FTP parser initialization from invalid line
> -------------------------------------------
>
>                 Key: NET-476
>                 URL: https://issues.apache.org/jira/browse/NET-476
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 3.1
>         Environment: Ubuntu Linux 10.04 amd64, vsftpd 2.2.2
>            Reporter: Konrad Garus
>
> After upgrading from 1.4.1 to 3.1, we noticed the FTP client sometimes fails to list
files. It seems to occur intermittently, possibly when the system is under relatively high
load and does not respond immediately.
> From stacktraces, it seems like multithreading issues or trying to parse system type
from reply to another command than SYST:
> {code}
> Caused by: org.apache.commons.net.ftp.parser.ParserInitializationException: Unknown parser
type: PORT command successful. Consider using PASV.
>         at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createFileEntryParser(DefaultFTPFileEntryParserFactory.java:118)
>         at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2359)
>         at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2142)
>         at 
> {code}
> {code}
> Caused by: org.apache.commons.net.ftp.parser.ParserInitializationException: Unknown parser
type: Directory send OK.
>         at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createFileEntryParser(DefaultFTPFileEntryParserFactory.java:118)
>         at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2359)
>         at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2142)
>         at 
> {code}

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