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https://issues.apache.org/jira/browse/CAMEL-12078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16335839#comment-16335839
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Claus Ibsen commented on CAMEL-12078:
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This is harder to avoid as its the java-mail mime multipart itself that does
this. I cannot see an easy solution.
>From where do you have those attachments in your use-case that is only
>readable once?
You can try to re-attach them with some custom DataHandler / DataSource where
the DataSource is re-readable via byte array input stream or stored as files.
Even if you remove that line 140 with the saveChanges then the java-mail
multipart will auto do that later when you call the write call where it then
will do a saveChanges first.
> MIME-Mutipart DataFormat reads attachment DataSource twice
> ----------------------------------------------------------
>
> Key: CAMEL-12078
> URL: https://issues.apache.org/jira/browse/CAMEL-12078
> Project: Camel
> Issue Type: Bug
> Components: camel-mail
> Affects Versions: 2.20.1
> Reporter: Tim Dudgeon
> Priority: Minor
> Fix For: Future
>
>
> As reported on mailing list if an attachment for MIME-Mutipart DataFormat is
> defined using a DataSource that can only be read once you get an exception.
> http://mail-archives.apache.org/mod_mbox/camel-users/201712.mbox/%3C0e0d4b2e-dc32-c61e-3ccd-7ee14238c485%40gmail.com%3E
> For instance, this happens if the DataSource is created using an InputStream
> that cannot be read multiple times
> It should be possible to post the data only reading the input a single time.
> I will add a test case shortly.
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