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https://issues.apache.org/jira/browse/SLING-2534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416273#comment-13416273
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Justin Edelson commented on SLING-2534:
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Patch isn't backwards compatible. I think you'll need to specify this behavior
via an additional parameter, e.g. myStringProp@DeleteIfBlank=false
> Strings of zero length on update in post servlet delete the property
> --------------------------------------------------------------------
>
> Key: SLING-2534
> URL: https://issues.apache.org/jira/browse/SLING-2534
> Project: Sling
> Issue Type: Bug
> Components: Servlets
> Affects Versions: Servlets Post 2.1.2
> Reporter: Endolf
> Attachments: blankstrings.patch
>
>
> According to JCR specs, for string type properties, a blank string should be
> a valid value. Currently the post servlet delets any property where 1 or less
> values are specifed and the 1 value has a 0 length. I think string properties
> with a zero length should be blanked instead of deleted.
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