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    <p>There are two ways to validate user input: annotations and by inheriting Spring's Validator class. For simple cases, the annotations are nice. If you need complex validations (like cross-field validation, eg. "verify email address" field), or if your model is validated in multiple places in your application with different rules, or if you don't have the ability to modify your model object by placing annotations on it, Spring's inheritance-based Validator is the way to go. I'll show examples of both.</p> <p>The actual validation part is the same regardless of which type of validation you're using:</p> <pre><code>RequestMapping(value="fooPage", method = RequestMethod.POST) public String processSubmit(@Valid @ModelAttribute("foo") Foo foo, BindingResult result, ModelMap m) { if(result.hasErrors()) { return "fooPage"; } ... return "successPage"; } </code></pre> <p>If you are using annotations, your <code>Foo</code> class might look like:</p> <pre><code>public class Foo { @NotNull @Size(min = 1, max = 20) private String name; @NotNull @Min(1) @Max(110) private Integer age; // getters, setters } </code></pre> <p>Annotations above are <code>javax.validation.constraints</code> annotations. You can also use Hibernate's <code>org.hibernate.validator.constraints</code>, but it doesn't look like you are using Hibernate. </p> <p>Alternatively, if you implement Spring's Validator, you would create a class as follows:</p> <pre><code>public class FooValidator implements Validator { @Override public boolean supports(Class&lt;?&gt; clazz) { return Foo.class.equals(clazz); } @Override public void validate(Object target, Errors errors) { Foo foo = (Foo) target; if(foo.getName() == null) { errors.rejectValue("name", "name[emptyMessage]"); } else if(foo.getName().length() &lt; 1 || foo.getName().length() &gt; 20){ errors.rejectValue("name", "name[invalidLength]"); } if(foo.getAge() == null) { errors.rejectValue("age", "age[emptyMessage]"); } else if(foo.getAge() &lt; 1 || foo.getAge() &gt; 110){ errors.rejectValue("age", "age[invalidAge]"); } } } </code></pre> <p>If using the above validator, you also have to bind the validator to the Spring controller (not necessary if using annotations):</p> <pre><code>@InitBinder("foo") protected void initBinder(WebDataBinder binder) { binder.setValidator(new FooValidator()); } </code></pre> <p>Also see <a href="http://static.springsource.org/spring/docs/current/spring-framework-reference/htmlsingle/spring-framework-reference.html#validation-mvc-triggering" rel="nofollow noreferrer">Spring docs</a>.</p> <p>Hope that helps.</p>
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    1. POSpring MVC: How to perform validation?
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    1. COwhen using Spring's Validator do i have to set the pojo from the controller and then validate it?
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    2. COI'm not sure I understand your question. If you see the controller code snippet, Spring is automatically binding the submitted form to the `Foo` parameter in the handler method. Can you clarify?
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    3. COok what i am saying is when the user submits the user inputs the Controller get the http request, from there what happens is it that you use the request.getParameter() to get all the user parameters then set the values in the POJO then pass the class to the validation object. The validation class will send the errors back to the view with the errors if any found. Is this the way it happens?
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