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https://issues.apache.org/jira/browse/FELIX-6009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17266162#comment-17266162
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Carsten Ziegeler commented on FELIX-6009:
-----------------------------------------
Committed the potential fix:
https://github.com/apache/felix-dev/commit/6a75e1226141b3f99cb8051da33be427f1c293b4
> Metatype AD empty String default value
> --------------------------------------
>
> Key: FELIX-6009
> URL: https://issues.apache.org/jira/browse/FELIX-6009
> Project: Felix
> Issue Type: Bug
> Components: Metatype Service
> Affects Versions: metatype-1.2.2
> Reporter: Andreas Lemmer
> Assignee: Carsten Ziegeler
> Priority: Critical
> Fix For: metatype-1.2.4
>
>
> I have an AD with a default value which is an empty string, like
> {{<AD id="server" type="String" default=""/>}}
> According to the OSGi Spec, the method AttributeDefinition.defaultValue() in
> this case must return an array with one element (which should be the empty
> string), because the cardinality is 0 (implicit) and the default is defined.
> However, the Felix Metatype Service implementation returns null for
> defaultValue().
> In my use case, this breaks everything, because a null value indicates a
> configuration error (default not given, although mandatory) whereas an empty
> string is perfectly fine.
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