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public ActionErrors validate(ActionMapping mapping, HttpServletRequest request){ //run the validations declared in validation.xml first ActionErrors errors = super.validate(mapping,request); if(errors != null && !errors.isEmpty()) return errors; errors = (errors == null) new ActionErrors() : errors; //run your custom validations next for(int i = commonWords.length - 1; i >= 0; i--){ if (_password.toUpper().equals(commonWords[i])){ errors.add("password", new ActionMessage("reg.error.password.toocommon", commonWords[i])); return errors; } } return (errors.isEmpty()) null : errors; } In Listing 15-11, validate() is called on the base class (ValidatorForm), which runs the validations defined in validation.xml. The end result is an ActionErrors object, to which we can add new error messages of our own. Notice the use of the second constructor of ActionMessage (see Appendix B), in order to customize the error message with the common word that was rejected in the validation.

memory by using the Program Space utilities This is where you will store the extremely large 2D array that will hold the font for your characters The second library is the TimerOne library that was first used in Project 19 Next, the three Digital Pins that will interface with the MAX7219 are declared: int DataPin = 2; // Pin 1 on MAX int LoadPin = 3; // Pin 12 on MAX int ClockPin = 4; // Pin 13 on MAX Then you create an array of type buffer with 8 elements: byte buffer[8]; This array will store the pattern of bits that will decide what LEDs are on or off when the display is active.

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Instead of implementing validate() as in Listing 15-11, we could extend the Validator framework. Do this sparingly. For the Registration webapp example, it would be overkill implementing validate() would suffice. However, in this subsection, I will extend the Validator framework for the same functionality, simply so you can compare the two approaches.

The role of Boards is evolving over time. Ten or more years ago, Boards were less aware of their role in governance; circumstances then may not have required it. Boards would often review the information that management presented to them, agree or disagree, and provide input but in some cases didn t consider themselves to be the starting point for good corporate governance, as many Boards do today. We ve seen examples, including with WorldCom and Enron, and more recently with financial organizations taking on too much risk, where the governance that emanated out of boardrooms was either inadequate or didn t make its way across the enterprise. Or both. Boards have now seen the requirement and need and shareholders are asking Boards to see the requirement and need to be much more involved in governance. The information necessary to be able to properly protect the shareholders and the company should be the focus of what Boards think about. Therefore, that information should be both comprehensive and

So, in what situations would extending the Validator framework be appropriate Actually, only when you can justify reuse of the custom validator. This usually means that the custom validator checks a variable prevalent in your webapp s problem domain. Good examples are identifiers, like product codes, ISBN numbers, IP addresses, or zip codes (or postal codes as they are known outside the United States). While these can be validated using the standard mask validator, it may not always be easy to do so, especially if you need to take care of exceptions to the rule (e.g., postal codes), or if the variable can change format over time (e.g., IP addresses). You d be much better off extending the Validator framework than implementing the validate() function because you obviously want to reuse the validations. A zip code field, for example, could appear in more than one form, or be present in many different webapps you might create. Creating a new validator is easy:

Next comes a large 2D array of type byte: static byte font[][8] PROGMEM = { // The printable ASCII characters only (32-126) {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, {B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000000, B00000100}, .etc This array is storing the pattern of bits that make up the font you will use to show text on the display It is a two dimensional array of type static byte You have also added after the array declaration the command PROGMEM This is a function from the Program Space utilities and it tells the compiler to store this array in the flash memory instead of the SRAM (Static Random Access memory) SRAM is the memory space on the ATmega chip that is normally used to store the variables and character strings used in your sketch They are copied from program space and into SRAM when used.

1. Implement the Java handler class that actually performs the validation. 2. Optionally create JavaScript for form validation. I won t cover this topic in this

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