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https://issues.apache.org/jira/browse/NET-342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991468#comment-12991468
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Bogdan Drozdowski commented on NET-342:
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This is the way it should be. You have not read the documentation and you
haven't called client.completePendingCommand() after the file transfer. This
didn't flush the server replies and messed up the server reply queue in the
client.
> Calling retrieveFileStream(fileName) before listFiles() causes
> ParserInitializationException
> --------------------------------------------------------------------------------------------
>
> Key: NET-342
> URL: https://issues.apache.org/jira/browse/NET-342
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 2.0
> Reporter: L K
>
> When calling FtpClient.retrieveFileStream(fileName) before
> FtpClient.listFiles() an
> org.apache.commons.net.ftp.parser.ParserInitializationException is thrown,
> giving the message: Unknown parser type: [last console output]
> Works:
> FTPFile[] ftpFiles = client.listFiles();
> InputStream is = client.retrieveFileStream("./test.txt");
> Works:
> client.pwd();
> FTPFile[] ftpFiles = client.listFiles();
> InputStream is = client.retrieveFileStream("./test.txt");
> Does not work:
> InputStream is = client.retrieveFileStream("./test.txt");
> client.pwd();
> FTPFile[] ftpFiles = client.listFiles();
> Output:
> org.apache.commons.net.ftp.parser.ParserInitializationException: Unknown
> parser type: "/" is the current directory
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