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https://issues.apache.org/jira/browse/FELIX-6384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17279486#comment-17279486
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Georg Henzler commented on FELIX-6384:
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This looks good/reasonable to me, [~cziegeler][~bosschaert] WDYT?
> Felix Configadmin Interpolator: Support default directive with empty value
> --------------------------------------------------------------------------
>
> Key: FELIX-6384
> URL: https://issues.apache.org/jira/browse/FELIX-6384
> Project: Felix
> Issue Type: Improvement
> Components: Configuration Admin
> Affects Versions: configadmin-interpolation-plugin-1.1.0
> Reporter: Konrad Windszus
> Priority: Major
>
> Currently in
> https://github.com/apache/felix-dev/tree/master/configadmin-plugins/interpolation#default-values
> it is not stated that an empty value is not supported as default value.
> Still the following code is not replaced as expected
> {code}
> $[env:NON_EXISTING_VAR;default=]
> {code}
> This is due to the parsing logic in
> https://github.com/apache/felix-dev/blob/0aa232a4ff8f95e92d947027ac7d8010e2a0e142/configadmin-plugins/interpolation/src/main/java/org/apache/felix/configadmin/plugin/interpolation/Interpolator.java#L118
> which detects the directive (in this case {{default}}) only in case there is
> at least one character after the {{=}}.
> This limitation should be lifted to also allow empty values as default
> values. At the same time values containing the character {{=}} should be
> allowed as well.
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