public void validate(){
        
        if ( personBean.getFirstName().length() == 0 ){ 
     
            addFieldError( "personBean.firstName", "First name is required." );
             
        }
         
                 
        if ( personBean.getEmail().length() == 0 ){ 
     
            addFieldError( "personBean.email", "Email is required." );
             
        }
         
        if ( personBean.getAge() < 18 ){ 
     
            addFieldError( "personBean.age", "Age is required and must be 18 or older" );
             
        }
         
         
    }