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https://issues.apache.org/jira/browse/PROTON-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17821868#comment-17821868
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ASF subversion and git services commented on PROTON-2795:
---------------------------------------------------------
Commit 81bd31500c4f8102409876cfc47a38f806d69fb3 in qpid-protonj2's branch
refs/heads/main from Timothy Bish
[ https://gitbox.apache.org/repos/asf?p=qpid-protonj2.git;h=81bd3150 ]
PROTON-2795 Additional tests and cleanups of message format handling
Ensure tests cover more cases of split frame transfers and message
format expectations. Improve test driver scripting for setting defaults
on outgoing Declare and Discharge frames.
> [protonj2] 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
> Fix For: protonj2-1.0.0-M20
>
>
> 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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