UsernameConstraint (Account Management App 7.1.0 API)

@Target({METHOD,FIELD})
@Retention(RUNTIME)
@Constraint(validatedBy=UsernameValidator.class)
public @interface UsernameConstraint

Author:: "Daniel Bernstein (dbernstein@duraspace.org)"

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  Class<?>[] groups
  
  String message
  
  Class<? extends javax.validation.Payload>[] payload

- Element Detail
  - message
```
String message
```
    Default:
    
    "The username is not available. Please choose another."
- - groups
```
Class<?>[] groups
```
    Default:
    
    {}
- - payload
```
Class<? extends javax.validation.Payload>[] payload
```
    Default:
    
    {}