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https://issues.apache.org/jira/browse/FELIX-6009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16731571#comment-16731571
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Carsten Ziegeler commented on FELIX-6009:
-----------------------------------------
On page 168 in the R7 compendium spec it reads "The empty
string is significant and must be seen as
an empty List or array if specified as the
default for an attribute with a cardinality
that is not equal to zero."
which leads me to believe that the implementation is correct; the cardinality
is zero
> 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
> 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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