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https://issues.apache.org/jira/browse/APEXCORE-528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15513460#comment-15513460
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Thomas Weise commented on APEXCORE-528:
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IMO output ports that don't have an annotation should be considered optional,
that's also the default in the annotation.
> Output Ports Not Optional by Default During Validation
> ------------------------------------------------------
>
> Key: APEXCORE-528
> URL: https://issues.apache.org/jira/browse/APEXCORE-528
> Project: Apache Apex Core
> Issue Type: Bug
> Affects Versions: 3.4.0
> Reporter: Alex McCullough
> Assignee: Alex McCullough
> Priority: Minor
>
> The 'optional' OutputPortFieldAnnotation states that the default value is
> true. When you build a DAG with multiple output ports the validator throws an
> error telling you at least one must be connected. To fix, you must explicitly
> add the annotation to all output ports and set the value to True, which is
> supposed to already be the default.
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