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https://issues.apache.org/jira/browse/AVRO-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976942#action_12976942
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Doug Cutting commented on AVRO-723:
-----------------------------------
Also, the testUndeclaredError test in TestProtocolGeneric, TestProtocolSpecific
and TestProtocolReflect should be updated to check that the error message
contains the original error message.
> Incorrect handling of Undeclared Errors in IPC calls to SpecificResponder
> -------------------------------------------------------------------------
>
> Key: AVRO-723
> URL: https://issues.apache.org/jira/browse/AVRO-723
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.5.0
> Reporter: Stephen Gargan
> Priority: Minor
> Attachments: undeclared-error.patch, undeclared-error.patch
>
>
> Undeclared errors thrown during service invocations are not getting returned
> correctly. When they are encountered, the writeError method in the responder
> will try to encode them using errors union for the message. However, because
> they are undeclared they are not present in the union and encoding causes a
> further AvroRuntimeException. Its this "Not in union" exception that gets
> returned to the client, not the undeclared problem which gets lost.
> The attached patch handles them like other system errors, calling to string
> on the exception and writing this as the error to be returned.
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