The "stock" validators provide default error messages. To override the default message,

• create or edit a global resource bundle, and
• add an entry corresponding to the field

The "message prefix" is invalid.fieldvalue. To create a message entry, append the field name to the prefix. For example, a field named user.dob would use the entry invalid.fieldvalue.user.dob.

invalid.fieldvalue.user.dob=Please enter Date of Birth in the correct format.