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https://issues.apache.org/jira/browse/JCR-2408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12787478#action_12787478
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Alexandre Capt commented on JCR-2408:
-------------------------------------

Considering the fact that for a nt:unstructured node, the mixin properties are 
not removed when removing the mixin (because they are accepted by the remaining 
nodetype), I decided to change my code to remove the properties in all the 
cases. 

Depending on what has been said before, this should work on nt:unstructured and 
nt:resoure nodetypes: 1) remove mixin properties 2) remove mixin 3) save.

But it does NOT. I get the same exception, except that it complains about the 
second property of the mixin: javax.jcr.nodetype.ConstraintViolationException: 
no matching property definition found for 
{http://www.day.com/jcr/cq/1.0}lastRolledoutBy

Code executed:

targetNode.getProperty("lastRolledout").remove();
targetNode.getProperty("lastRolledoutBy").remove();
targetNode.removeMixin("cq:LiveRelationship");

Exception is thrown on session.save();


> Mixin removal exception
> -----------------------
>
>                 Key: JCR-2408
>                 URL: https://issues.apache.org/jira/browse/JCR-2408
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 2.0-beta1
>            Reporter: Alexandre Capt
>         Attachments: JCR-2408.patch
>
>
> When trying to remove a mixin from a non nt:unstructured node (in my case 
> nt:resource), you get the following exception:
> Unable to alter mixin types: javax.jcr.nodetype.ConstraintViolationException: 
> no matching property definition found for 
> {http://www.day.com/jcr/cq/1.0}lastRolledout
> lastRolledout property is defined by the mixin cq:LiveRelationship that I am 
> trying to remove.

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