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## 6.27. < rich:beanValidator >

### 6.27.1. Description

The <rich:beanValidator> is a component designed to provide validation using Hibernate model-based constraints

### 6.27.2. Key Features

- Validation using Hibernate constraints

Table 6.54. rich : beanValidator attributes

Attribute Name | Description
--- | ---
binding | A ValueExpression that evaluates to an instance of FacesBeanValidator.
summary | Summary message for a validation errors.

Table 6.55. Component identification parameters

Name | Value
--- | ---
component-type | org.richfaces.beanValidator
component-class | org.richfaces.component.html.HtmlbeanValidator
component-family | org.richfaces.beanValidator
renderer-type | org.richfaces.beanValidatorRenderer
tag-class | org.richfaces.taglib.beanValidatorTag

### 6.27.3. Creating the Component with a Page Tag

To create the simplest variant of the component on a page use the following syntax:

Example:

    ...

    <h:inputText value="#{validationBean.email}" id="email">

           <rich:beanValidator summary="Invalid email"/>

    </h:inputText>

    ...

### 6.27.4. Creating the Component Dynamically Using Java

Example:

    import org.richfaces.component.html.HtmlCalendar;

    ...

    HtmlbeanValidator mybeanValidator= new HtmlbeanValidator();

    ...

### 6.27.5. Details of Usage

Starting from 3.2.2 GA version Rich Faces provides support for model-based constraints defined using Hibernate Validator. Thus it's possible to use Hibernate Validators the same as for Seam based applications.

The <rich:beanValidator> component is defined in the same way as any JSF validator. Look at the example below.

    ...

    <rich:panel>

           <f:facet name="header">

                  <h:outputText value="#{validationBean.progressString}" id="progress"/>

           </f:facet>

           <h:panelGrid columns="3">

                  <h:outputText value="Name:" />

                  <h:inputText value="#{validationBean.name}" id="name">

                         <rich:beanValidator summary="Invalid name"/>

                  </h:inputText>

                  <rich:message for="name" />

                  <h:outputText value="Email:" />

                  <h:inputText value="#{validationBean.email}" id="email">

                         <rich:beanValidator summary="Invalid email"/>

                  </h:inputText>

                  <rich:message for="email" />

                  <f:facet name="footer">

                         <a4j:commandButton value="Submit" action="#{validationBean.success}" reRender="progress"/>

                  </f:facet>

           </h:panelGrid>

    </rich:panel>

    ...

Please play close attention on the bean code that contains the constraints defined with Hibernate annotation which perform validation of the input data.

    package org.richfaces.demo.validation;

    import org.hibernate.validator.Email;

    import org.hibernate.validator.Length;

    import org.hibernate.validator.NotEmpty;

    public class ValidationBean {

        @NotEmpty

        @Length(min=3,max=12)

        private String name;

        @Email

        @NotEmpty

        private String email;

        public ValidationBean() {

        }

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        public String getEmail() {

            return email;

        }

        public void setEmail(String email) {

            this.email = email;

        }

    }

The following figure shows what happens if validation fails

Figure 6.5. <rich:beanValidator> usage

As you can see from the example that in order to validate the <rich:beanValidator> should be nested into a input JSF or RichFaces component.

The component has the only attribute - "summary" which displays validation messages about validation errors.

### 6.27.6. Relevant Resources Links

Here you can see an example of <rich:beanValidator> usage and sources for the given example.

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