The Grails Framework 3.1.1

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(Quick Reference) # blank ## Purpose Validates that a String value is not blank. ## Examples
    login blank: false
## Description Set to `false` if a string value cannot be blank. Error Code: `className.propertyName.blank` If the string is `null`, it won't validate with `blank: true`. In this case, set the nullable constraint to `true`. | Quick Reference (hide)