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public void validate(Object target, Errors errors) { ValidationUtils.rejectIfEmptyOrWhitespace(errors, "courtName", "required.courtName", "Court name is required."); ValidationUtils.rejectIfEmpty(errors, "date", "required.date", "Date is required."); ValidationUtils.rejectIfEmpty(errors, "hour", "required.hour", "Hour is required."); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "player.name", "required.playerName", "Player name is required."); ValidationUtils.rejectIfEmpty(errors, "sportType", "required.sportType", "Sport type is required."); Reservation reservation = (Reservation) target; Date date = reservation.getDate(); int hour = reservation.getHour(); if (date != null) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) { if (hour < 8 || hour > 22) { errors.reject("invalid.holidayHour", "Invalid holiday hour."); } } else { if (hour < 9 || hour > 21) { errors.reject("invalid.weekdayHour", "Invalid weekday hour."); } } } } } In this validator, you use utility methods such as rejectIfEmptyOrWhitespace() and rejectIfEmpty() in the ValidationUtils class to validate the required form fields. If any of these form fields is empty, these methods will create a field error that will be bound to the field. The second argument of these methods is the property name, while the third and fourth are the error code and default error message. You also check whether the reservation hour is valid on holidays and weekdays. In case of invalidity, you should use the reject() method to create an object error that will be bound to the reservation object, not to a field. To apply this validator to your controller, you just configure an instance of it, either as an inner bean or via a bean reference, in the validator property. If you have multiple validators to apply for a controller, you can set them in the validators property instead, whose type is an array. <bean id="reservationFormController" class="com.apress.springrecipes.court.web.ReservationFormController"> ... <property name="validator">

To develop web services with the contract-first approach, you have to process request and response XML messages. If you parse the XML messages with XML parsing APIs directly, you ll have to deal with the XML elements one by one with low-level APIs, which is a cumbersome and inefficient task.

<bean class="com.apress.springrecipes.court.domain. ReservationValidator" /> </property> </bean> As your validators may create errors during validation, you should define messages for the error codes for displaying to the user. If you have ResourceBundleMessageSource defined, you can include the following error messages in your resource bundle for the appropriate locale (e.g., messages.properties for the default locale): required.courtName=Court name is required required.date=Date is required required.hour=Hour is required required.playerName=Player name is required required.sportType=Sport type is required invalid.holidayHour=Invalid holiday hour invalid.weekdayHour=Invalid weekday hour

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In a web application, you sometimes have to deal with complex forms that span multiple pages. Forms like this are usually called wizard forms, as users have to fill them page by page just like using a software wizard. Undoubtedly, you can create one or more form controllers by extending SimpleFormController to handle a wizard form. However, you will have much to do if you maintain the form status across multiple pages.

Spring-WS supports using XML marshalling technology to marshal/unmarshal objects to/from XML documents. In this way, you can deal with object properties instead of XML elements. This technology is also known as object/XML mapping (OXM), because you are actually mapping objects to and from XML documents.

The AbstractWizardFormController class provided by Spring MVC defines the basic tasks for wizard form handling. It also supports the concept of a command object and can bind form fields in multiple pages to a single command object s properties of the same name. By extending the AbstractWizardFormController class, your form controller will inherit the ability to handle wizard forms. As there are multiple form pages for a wizard form, you have to define multiple page views for a wizard form controller. This controller will then manage the form status across all these form pages. In a wizard form, there are multiple actions instead of a single submit action in SimpleFormController. AbstractWizardFormController will determine a user s action by a special request parameter, usually specified as the name of a submit button: _finish: Finish the wizard form. _cancel: Cancel the wizard form. _targetx: Step to the target page, where x is the zero-based page index.

To implement endpoints with an XML marshalling technology, you have to extend the AbstractMarshallingPayloadEndpoint class and configure an XML marshaller for it. Table 5-3 lists the marshallers provided by Spring-WS for different XML marshalling APIs. Table 5-3. Marshallers for Different XML Marshalling APIs

Adaptive Software Development [Highsmith 1999] Dynamic System Development Method (DSDM) [Stapleton 2003] Evolutionary Project Management (EPM or Evo) [Gilb 1989] Feature-Driven Development (FDD) [Palmer and Felsing 2002] Lean Software Development [Poppendieck 2003] Microsoft Solutions Framework (MSF) [Microsoft 2003] OPEN Process Framework [Firesmith and Henderson-Sellers 2001] SCRUM [Schwaber and Beedle 2001]

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