--- title: Using Bean Validation To Validate Input order: 45 layout: page --- [[using-bean-validation-to-validate-input]] = Using Bean Validation to validate input Before you get started with Bean Validation you need to download a Bean Validation implementation and add it to your project. You can find one for instance at http://bval.apache.org/downloads.html. Just add the jars from the lib folder to your project. Bean Validation works as a normal validator. If you have a bean with Bean Validation annotations, such as: [source,java] .... public class Person { @Size(min = 5, max = 50) private String name; @Min(0) @Max(100) private int age; // + constructor + setters + getters } .... You can create a field for the name field as you always would: [source,java] .... Person person = new Person("John", 26); TextField firstName = new TextField("First name"); setContent(firstName); .... and bind the field with a bean validation binder: [source,java] .... BeanValidationBinder binder = new BeanValidationBinder<>(Person.class); binder.forField(firstName).bind("name"); binder.setBean(person); .... Your `firstName` field is now automatically validated based on the annotations in your bean class. You can do the same thing for the `age` field and you won't be able to set a value outside the valid 0-100 range. A Bean Validation tutorial is available here: http://docs.oracle.com/javaee/6/tutorial/doc/gircz.html '8.2'>8.2 Vaadin 6, 7, 8 is a Java framework for modern Java web applications: https://github.com/vaadin/frameworkwww-data

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