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Posted to dev@mina.apache.org by "Jonathan Valliere (Jira)" <ji...@apache.org> on 2021/07/31 15:18:00 UTC
[jira] [Resolved] (DIRMINA-1137) PortUnreachable not check while
writing to socket
[ https://issues.apache.org/jira/browse/DIRMINA-1137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Valliere resolved DIRMINA-1137.
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Assignee: Jonathan Valliere
Resolution: Not A Problem
The operating system is responsible for emitting {{UnreachablePortException}}. There is no guarantee that you will even get that exception. You are using a Datagram Socket, which has no guarantee of anything unless you write your program on the receiver side to send back acknowledgments of received data.
You should just switch to using a TCP socket instead. This will provide you with guaranteed delivery.
> PortUnreachable not check while writing to socket
> -------------------------------------------------
>
> Key: DIRMINA-1137
> URL: https://issues.apache.org/jira/browse/DIRMINA-1137
> Project: MINA
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.1.4
> Environment: Java 1.8, Unix/Windows
> Reporter: Alexander B
> Assignee: Jonathan Valliere
> Priority: Critical
> Attachments: exceptionstack.png, minatest2.7z
>
>
> Hi guys,
> My intention is to send udp package to a specific ip and port (even if there is not receiver). Me - as the sender - do not have any knowledge about (existing) receivers. After receiving a "unreachable port" package back to myself (because no receiver exists), the session was closed automatically.
> In your class AbstractPollingIoProcessor from lines 1108ff. in such a case a UnreachablePortException was thrown, catched and therefore in line 1112 the session was closed.
> In contrast to this, while reading from a socket (lines 560ff.), you are distinguishing cases with and without the flag CloseOnPortUnreachable from the sessionConfig. [I am not quite sure about my statement here]
> Can you explain, why this was not done at the "writing"-process? Or was there anything I missunderstood?
> Thanks
> Alex
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