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https://issues.apache.org/jira/browse/PROTON-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Gemmell resolved PROTON-2188.
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Resolution: Fixed
> NPE thrown upon attempt to encode map entry with unknown key/value type
> -----------------------------------------------------------------------
>
> Key: PROTON-2188
> URL: https://issues.apache.org/jira/browse/PROTON-2188
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-j
> Affects Versions: proton-j-0.33.3
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Priority: Trivial
> Fix For: proton-j-0.33.4
>
>
> When trying to encode an object directly that the codec has no known encoding
> for, or similarly for a list entry of unknown type, an
> IllegalArgumentException is thrown to indicate the issue that no encoding is
> known. If however the unknown element type is the key or value of a map entry
> being encoded then a NullPointerException occurs instead, making the issue
> unclear. A similar IllegalArgumentException should instead be thrown in these
> cases also to make the application issue clearer.
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