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copied!<p>In Spring 3 the <em>best</em> way to go <em>is</em> to use annotations, if you can switch. The integration with the bean validation API makes it easy to add validation. All you have to do to validate a form bean is to add the @Valid (see "5.7.4.1 Triggering @Controller Input Validation" in the Spring MVC docs chapter "5. Validation, Data Binding, and Type Conversion") annotation to a controller method argument. Spring will then validate the bean and put the validation errors into a BindingResult for you.</p> <pre><code>@Controller public class RegisterFormController { ... @RequestMapping(value = "/register", method = RequestMethod.POST) public String submitFormHandler(@ModelAttribute("registration") @Valid User user, BindingResult errors) { if (errors.hasErrors()) { // send user back to form view } else { // handle form submission } } ... } </code></pre> <p>The docs say that Spring will automatically set up the bean validation factories and validators, but if that doesn't work for you, you can manually configure it very easily:</p> <pre><code> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="webBindingInitializer">  <bean class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer"> <property name="validator" ref="validator" /> </bean> </property> </bean>  <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" /> </code></pre> <p>I also created a project based on the client-side implementation of "valang" validation from the validation Spring Module that can provide client-side validation in JavaScript based on the JSR-303 and Hibernate Validator validation annotations.</p> <p><a href="http://kenai.com/projects/jsr303js" rel="nofollow noreferrer">http://kenai.com/projects/jsr303js</a></p> <p>The project provides a taglib/JavaScript file that you include to put the main JavaScript code into the page, then another tag that you put somewhere in your Spring <code><form:form></form:form></code> tag to trigger the validation.</p> <pre><code><%@ taglib prefix="jsr303js" uri="http://kenai.com/projects/jsr303js/" %> ... <head> ... <script type="text/javascript" src="<c:url value="/js/jsr303js-codebase.js"/>"></script> ... </head> <body> ... <form:form name="regForm" commandName="registration" method="post"> ... <jsr303js:validate commandName="registration"/> ... </form:form> </code></pre>

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