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https://issues.apache.org/jira/browse/FELIX-4665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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J.W. Janssen resolved FELIX-4665.
---------------------------------
Resolution: Fixed
Fix Version/s: metatype-1.0.12
Fixed in rev #1653581.
> Metatype service does not allow a default empty string in XML resource
> ----------------------------------------------------------------------
>
> Key: FELIX-4665
> URL: https://issues.apache.org/jira/browse/FELIX-4665
> Project: Felix
> Issue Type: Bug
> Components: Metatype Service
> Affects Versions: metatype-1.0.10
> Reporter: David Humeniuk
> Fix For: metatype-1.0.12
>
>
> An entry like the following will be treated as invalid and the default will
> change to null instead of an empty string:
> {code}
> <AD id="string.prop" cardinality="0" required="false" default=""
> type="String" description="Some string property"/>
> {code}
> MetaDataReader.readAD() method will first set the default value, then later
> check if the value is required:
> {code}
> ad.setDefaultValue( this.getOptionalAttribute( "default" ) );
> ad.setRequired( this.getOptionalAttribute( "required", true ) );
> {code}
> However, setDefaultValue method will check if the value is required (before
> it is known) in ADValidator.validateString():
> {code}
> if (ad.isRequired() && ((value == null) || (length == 0)))
> {
> // Possible if the cardinality != 0 and input was something like
> // "0,,1"...
> return AD.VALIDATE_MISSING;
> }
> {code}
> The call to isRequired() will always be true at the time of the call.
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