Since it's "expression" is an OGNL expression, have you tried instead:
@FieldExpressionValidator(expression = "usernameAvailable", message = "...") which would attempt to find, in turn, getUsernameAvailable() and then isUsernameAvailable()... I would be curious to know if that works. My two cents... 2008/8/2 Hrvoje Ban <[EMAIL PROTECTED]> > I placed validation code for one of my fields inside action's method > and I'm trying to call it using OGNL expression: > > @FieldExpressionValidator(expression = "isUsernameAvailable()", > message = "...") >