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https://issues.apache.org/jira/browse/PROTON-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17820089#comment-17820089
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Arnaud Cogoluègnes commented on PROTON-2795:
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{quote}The default AMQP message format is Zero as per the specification{quote}
I can find it in the spec, can you point me to the section? Thanks.
> Message format cannot be set to 0 on outbound messages
> ------------------------------------------------------
>
> Key: PROTON-2795
> URL: https://issues.apache.org/jira/browse/PROTON-2795
> Project: Qpid Proton
> Issue Type: Bug
> Components: protonj2
> Affects Versions: protonj2-1.0.0-M19
> Reporter: Arnaud Cogoluègnes
> Assignee: Timothy A. Bish
> Priority: Minor
>
> Setting the message format to 0 or keeping the default value results in a
> null value in the {{transfer}} frame.
> 0 seems to be considered [a special
> value|https://github.com/apache/qpid-protonj2/blob/d5144af7818b2695747782bacc410580d3ec7943/protonj2/src/main/java/org/apache/qpid/protonj2/engine/impl/ProtonSessionOutgoingWindow.java#L270-L274]
> in the code.
> This contradicts [the
> Javadoc|https://github.com/apache/qpid-protonj2/blob/d5144af7818b2695747782bacc410580d3ec7943/protonj2-client/src/main/java/org/apache/qpid/protonj2/client/AdvancedMessage.java#L170-L200]:
> {quote}This field MUST be specified for the first transfer of a
> multi-transfer message, if it is not set at the time of send of the first
> transfer the sender uses the AMQP default value of zero for this field.{quote}
> As well as the AMQP spec (section 2.7.5):
> {quote}This field MUST be specified for the first transfer of a
> multi-transfer message and can only be omitted for continuation transfers. It
> is an error if the message-format on a continuation transfer differs from the
> message-format on the first transfer of a delivery.{quote}
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