annotation-based bean validation error messages

[domurtag]

Hi,

I'm investigating an annotation-based approach to command bean validation using spring modules. In the tutorial, the following command bean (getters and setters omitted) is used:

public final class UserMessage {  
       
  @NotBlank  
  @Length(max = 80)  
  private String name;  
       
  @NotBlank  
  @Email  
  @Length(max = 80)  
  private String email;  
       
  @NotBlank  
  @Length(max = 4000)  
  private String text;  
}

And the following are (some of the) configured error messages:

UserMessage.email[not.blank]=Please enter your e-mail address.  
UserMessage.email[email]=Please enter a valid e-mail address.  
UserMessage.email[length]=Please enter no more than {2} characters.

The net effect is that if the rule about e-mail length is not observed, the message produced is:

"Please enter no more than 80 characters"

Where are the values substituted for each of the {} placeholders documented? In other words, how can I find out what will be substituted for {0}, {1},...,{N} for a particular validation rule?

Thanks in advance,
DM