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https://issues.apache.org/jira/browse/CAMEL-8887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14593247#comment-14593247
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Claus Ibsen commented on CAMEL-8887:
------------------------------------
See
http://camel.apache.org/how-do-i-configure-endpoints.html
> Exceptions on routes SFTP and SEDA or DISRUPTOR (probably others)
> -----------------------------------------------------------------
>
> Key: CAMEL-8887
> URL: https://issues.apache.org/jira/browse/CAMEL-8887
> Project: Camel
> Issue Type: Bug
> Components: camel-ftp
> Environment: Camel running on Windows, polling Linux server.
> Reporter: Gwenhaël PASQUIERS
> Priority: Minor
>
> When polling from SFTP, if the exchanges are sent to asynchronous routes
> (seda, disruptor) many different types of exceptions happen everytime, when
> retrienving the content or deleting / moving / renaming the polled files.
> The cause is that when routes are executed asynchronously, concurrent calls
> to SftpOperations are made. It looks like SftpOperations as well as
> ChannelSftp (Jsch) are not thread-safe. Sftp commands are either colliding,
> and sometime are invalid at the protocol level.
> One workaround is to make SftpOperations thread-safe by making its methods
> synchronized.
> Maybe there is another better place for a fix but i leave that to the
> specialists.
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