[NET-419] Not possible to call FTPClient.abort() method correctly

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0
• Component/s: FTP

Environment

java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)

Linux cattie 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

• Assignee: Unassigned
• Reporter: Tomas Mysik
• Created: 11/Aug/11 11:25
• Updated: 13/Jul/21 03:32

Description

Unfortunately, it seems that there are difficulties of using FTPClient.abort()
method [1][2]. Also, it is really not clear how the abort() method should be
called/used at all - if from another thread (as I would expect) then there is a problem with
thread-safety: FTPClient itself is not thread-safe so it means that some
custom lock/monitor must be used; but this lock will prevent calling abort() on
the FTPClient while it is downloading/uploading file since file upload/download
itself is blocking...

If I'm wrong and the abort() method works then an example in Javadoc would be more than welcome.

Thanks a lot.
[1] http://apache-commons.680414.n4.nabble.com/Net-FTPClient-abort-problem-td739542.html
[2] http://www.tikalk.com/java/forums/apache-ftp-client-abort-transfer

Issue Links

• is duplicated by: NET-460 _retrieveFile() blocks calling thread, on FTP I/O till the time file transfer is complete