JSF Tutorial - JSF Custom Validation Error Message Example

The following code shows how to create custom validation message.

Example

The following code is from UserBean.java.

package com.java2s.common;

import java.io.Serializable;
import java.sql.Date;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
 
@ManagedBean(name="user")
@SessionScoped
public class UserBean implements Serializable{
  
  String username;
  Date dob;

  public String getUsername() {
    return username;
  }
  public void setUsername(String username) {
    this.username = username;
  }
  public Date getDob() {
    return dob;
  }
  public void setDob(Date dob) {
    this.dob = dob;
  }

}

The following code is from demo.xhtml.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"   
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      >
    <h:body>
    <h:form>
      <h:panelGrid columns="3">
      
        Enter your username :
        
        <h:inputText id="username" value="#{user.username}" 
          size="20" required="true" label="Username">
          <f:validateLength minimum="5" maximum="10" />
        </h:inputText>
        
        <h:message for="username" style="color:red" />
        
        Enter your DOB :
        
        <h:inputText id="dob" value="#{user.dob}" 
          size="20" required="true" label="Date of Birth">
          <f:convertDateTime />
        </h:inputText>
        
        <h:message for="dob" style="color:red" />
        
      
      </h:panelGrid>
      
      <h:commandButton value="Submit" action="result" />
      
    </h:form>
    
    </h:body>
</html>

The following code is from MyMessage.properties.

javax.faces.converter.DateTimeConverter.DATE={2}: ''{0}'' could not be understood as a date.
javax.faces.converter.DateTimeConverter.DATE_detail=Invalid date format.

javax.faces.validator.LengthValidator.MINIMUM=Minimum length of ''{0}'' is required.

The following code is from result.xhtml.

Download Custom-Validation-Error-Message.zip

To RUN

Copy the generated WAR file from the target folder to Tomcat deployment folder and run Tomcat-Install-folder/bin/startup.bat.

After Tomcat finish starting, type the following URL in the browser address bar.

http://localhost:8080/simple-webapp/demo.xhtml