ConstraintViolation Exception is thrown when an action would violate a constraint on repository structure. For example, when an attempt is made to persistently add an item to a node that would violate that node's node type.Refer these documentsjavax.jcr.nodetype.ConstraintViolationException: OakCons...

Hi,I think its because, the sling request is not sent in your servlet.I also faced the same issue.Try using sling request in resource resolver.I Hope it will work.private static final String tagid = "/content/cq:tags/properties";TagManager tagManager = slingRequest.getResourceResolver().adaptTo(TagM...