(Quick Reference) # 10.12.3 Vnd.Error Support Version: 6.0.0 ## 10.12.3 Vnd.Error Support Vnd.Error is a standardised way of expressing an error response. By default when a validation error occurs when attempting to POST new resources then the errors object will be sent back allow with a 422 respond code:
    $ curl -i -H "Accept: application/json"  -H "Content-Type: application/json" -X POST -d "" http://localhost:8080/books

    HTTP/1.1 422 Unprocessable Entity
    Server: Apache-Coyote/1.1
    Content-Type: application/json;charset=ISO-8859-1

    {
      "errors": [
        {
          "object": "rest.test.Book",
          "field": "title",
          "rejected-value": null,
          "message": "Property [title] of class [class rest.test.Book] cannot be null"
        }
      ]
    }
If you wish to change the format to Vnd.Error then simply register `grails.rest.render.errors.VndErrorJsonRenderer` bean in `grails-app/conf/spring/resources.groovy`:
    beans = {
        vndJsonErrorRenderer(grails.rest.render.errors.VndErrorJsonRenderer)
        // for Vnd.Error XML format
        vndXmlErrorRenderer(grails.rest.render.errors.VndErrorXmlRenderer)
    }
Then if you alter the client request to accept Vnd.Error you get an appropriate response:
    $ curl -i -H "Accept: application/vnd.error+json,application/json" -H "Content-Type: application/json" -X POST -d "" http://localhost:8080/books
    HTTP/1.1 200 OK
    Server: Apache-Coyote/1.1
    Content-Type: application/vnd.error+json;charset=ISO-8859-1

    [
        {
            "logref": "book.nullable,
            "message": "Property [title] of class [class rest.test.Book] cannot be null",
            "_links": {
                "resource": {
                    "href": "http://localhost:8080/rest-test/books"
                }
            }
        }
    ]
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