JSF 2.0, Bean Validation and labels

问题

How can I show the field label in a JSF error message when bean validation is used?

<h:messages/>
<h:inputText label="Username" value="#{myBean.username}" />
...   

 

public class MyBean {
    @NotNull
    private String username;
    ...
}

If no user name is submitted only "Must not be null" is shown and there is no field reference.

回答1:

To display the concerned component's label in the error message define a new value for the property javax.faces.validator.BeanValidator.MESSAGE in a resource bundle of the application like this:

javax.faces.validator.BeanValidator.MESSAGE={1}: {0}

The placeholder {0} refers to the error message as created by the Bean Validation runtime, {1} refers to the component label. More information can be found in the JSF 2 spec. section 3.5.6.3.

来源：https://stackoverflow.com/questions/6803536/jsf-2-0-bean-validation-and-labels