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From "Sebb (JIRA)" <>
Subject [jira] [Commented] (NET-397) FTPSClient does not handle AUTH or ADAT and only partially handles PBSZ. FTPSCommand should be deprecated
Date Thu, 31 Mar 2011 16:17:05 GMT


Sebb commented on NET-397:

Thanks again!

Cannot remove FTPSCommand without breaking binary compat. and I don't want to do that.

I've just realised that overriding sendCommand(int) and sendCommand(int, String) cannot be
made to work properly, as it cannot distinguish between int values from FTPCommand and int
values from FTPSCommand. For the values that overlap, there's no way to know what the caller
intended. I suppose the method could reject all duplicate values, but that might break existing
code (which uses the FTPCommand strings). [Had enums been used, this would not have been an

Good suggestion re sendFTPSCommand(); that would solve the problem of differentiating the
different int ranges. 
However I think it might make the API more confusing, so I think deprecation is better. If
FTPSClient provides exec() methods for all the FTPS commands there is then no need to use
the integers (and anyway, FTPSCommand.getCommand() can be used to convert the int to String)

I've no idea about PBSZ either, beyond extracting the minimum value for use by client code.
Could start with that.

> FTPSClient does not handle AUTH or ADAT and only partially handles PBSZ. FTPSCommand
should be deprecated 
> ----------------------------------------------------------------------------------------------------------
>                 Key: NET-397
>                 URL:
>             Project: Commons Net
>          Issue Type: Bug
>            Reporter: Sebb
>         Attachments: ftps-rfc2228.diff
> FTPSClient does not provide any code to handle AUTH or ADAT, and does not provide support
for handling a reduced buffer size provided by the server.
> FTPSCommand defines int values for AUTH and ADAT, but if the integer values are used
by client code, the value will be passed to FTPClient, which uses its own array of command
strings, and FTPSCommand.AUTH will translate to "USER" and ADAT => "PASS", similarly for
> These commands all need special handling, so should be dealt with by FTPSClient only.
> FTPSClient can override the sendCommand(int) and sendCommand(int, String) methods in
FTPClient which will help prevent problems.
> Since most of these commands need additional special handling, there should be execNAME()
methods for each.
> FTPSCommand should be deprecated.

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