Skip to main content

The HelloWorld example of JSF 2.2 with Myfaces

I just did by myself create a very simple app "HelloWorld" of JSF 2.2 with a concrete implementation Myfaces that we can use it later on for our further JSF trying out. I attached the source code link at the end part. Just follow these steps below:

1. Create a Maven project in Eclipse (Kepler) with a simple Java web application archetype "maven-archetype-webapp". Maven should be the best choice for managing the dependencies, so far. JSF is a web framework that is the reason why I chose the mentioned archetype for my example.

2. Import dependencies for JSF implementation - Myfaces (v2.2.10) into file pom.xml. The following code that is easy to find from http://mvnrepository.com/ with key words "myfaces".

<dependency>
 <groupId>org.apache.myfaces.core</groupId>
 <artifactId>myfaces-api</artifactId>
 <version>2.2.10</version>
 </dependency>
<dependency>
 <groupId>org.apache.myfaces.core</groupId>
 <artifactId>myfaces-impl</artifactId>
 <version>2.2.10</version>
</dependency>

3. As any other web frameworks, we need to configure for JSF stuffs in file web.xml, follow this http://myfaces.apache.org/wiki/core/user-guide/getting-started/configuring-myfaces.html

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
 xmlns="http://java.sun.com/xml/ns/javaee" 
 xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
 version="2.5">
 
 <!-- JSF mapping -->
 <servlet>
  <servlet-name>Faces Servlet</servlet-name>
  <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>Faces Servlet</servlet-name>
  <url-pattern>*.xhtml</url-pattern>
 </servlet-mapping>
  
  <!-- welcome page -->
  <welcome-file-list>
    <welcome-file>index.xhtml</welcome-file>
  </welcome-file-list>
</web-app>

4. Create a Managed Bean by Java classes and  use JSF tags in index.xhtml for testing

Java code:

package vn.nvanhuong.jsf_myfaces;

import javax.faces.bean.ManagedBean;

@ManagedBean(name = "helloBean")
public class HelloManagedBean {
 
 public HelloManagedBean() {
  this.greeting = "Hello JSF - Myfaces";
 }

 private String greeting;

 public String getGreeting() {
  return greeting;
 }

 public void setGreeting(String greeting) {
  this.greeting = greeting;
 }
}

XHTML code:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:h="http://java.sun.com/jsf/html">
 <h:head>
  <title>JSF - Myfaces Example</title>
 </h:head>
 <h:body>
  <h:outputText value="#{helloBean.greeting}"/>
 </h:body>
</html>

5. Run the application on server Tomcat (v7.0)

http://localhost:8080/jsf_myfaces/



Source code: https://github.com/vnnvanhuong/jsf_myfaces



References:

[1]. http://myfaces.apache.org/wiki/core/user-guide/getting-started/configuring-myfaces.html

[2]. http://mvnrepository.com/

[3]. http://docs.oracle.com/javaee/6/tutorial/doc/bnaxj.html













Labels:











Reactions:


























Comments











Post a Comment



















Popular posts from this blog



















Why Business Rules Engine?




























"A good DSL minimizes the 'communication gap' between a domain concept and the code that implements it" - Robert C. Martin

A Use Case
It looks like adopting a new technology is always driven by a business need.


The organizations, such as banks, have their own business processes (such as data gathering and document management). These processes are different from others but usually the differences are not big. How do we build a product which can be reused the similar features but still be adaptable with the specific requirements of each bank? Then, the answer is we should have a library/framework. There is an idea that we can implement this library/framework by using a business rules engine. Which has the following benefits:
Be able to modify implementation of business domain at runtime (such as XML, CSV)Source code is more readable for both developers and domain experts. Therefore, source code can be consider it as a document
Sine Business Rules Engines support for Dom…




















Post a Comment









Read more






























Strategy Design Pattern




























For example, I have an program with an Animal abstract class and two sub-classes Dog and Bird. I want to add a new behavior for the class Animal, this is "fly".  Now, I face to two approaches to solve this issue:


1. Adding an abstract method "fly" into the class Animal. Then, I force the sub-classes should be implemented this method, something like:

public abstract class Animal{
 //bla bla
 public abstract void fly();
}

public class Bird extends Animal{
 //bla bla
 public void fly(){
 System.out.println("Fly high");
 }
}

public class Dog extends Animal{
 //bla bla
 public void fly(){
  System.out.println("Cant fly");
 }
}


2. Creating an interfaces with method "fly" inside. The same issue to abstract class, I force the classes these implement this interface should have a method "fly" inside:

public interface Flyable{
 public void fly();
}
public class Bird implements Flyable{
//bla bla
 public void fly(){
  System.out.println…




















Post a Comment









Read more






























Styling Sort Icons Using Font Awesome for Primefaces' Data Table




























So far, Primefaces has used image sprites for displaying the sort icons. This leads a problem if we want to make a different style for these icons; for example, I would make the icon "arrow up" more blurry at the first time table loading because I want to highlight the icon "arrow down". I found a way that I can replace these icons to Font Awesome icons.

 

We will use "CSS Pseudo-classes" to archive it. The hardest thing here is that we should handle displaying icons in different cases. There is a case both "arrow up" and "arrow down" showing and other case is only one of these icons is shown.


.ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s {
    background-image: none;
    margin-left: 5px;
    font-size: 1.1666em;
    position: relative;
}

.ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s:not(.ui-icon-triangle-1-s)::before {
    content: "\f106";
    font-family: "FontAwesome";
    position: absolute;
    t…




















Post a Comment









Read more




























Attribute 'for' of label component with id xxxx is not defined




























I got the warning in the log file when I have used the tag <h:outputLabel> without attribute "for" in xhtml file. It was really polluting my server log files.


The logged information actually makes sense anyway! We could find an answer as the following: 

"Having h:outputLabel without a "for" attribute is meaningless. If you are not attaching the label, you should be using h:outputText instead of h:outputLabel."


However, these solutions are not possible just for my situation. Instead of using h:outputText for only displaying text, my team has used h:outputLabel too many places. We were nearly in our release time (next day) so it is quite risky and takes much efforts if we try to correct it. Because the style (with CSS) is already done with h:ouputLabel. The alternative by adding attribute "for" the existing h:outputLabel is not reasonable either. I really need to find another solution.
Fortunately, I came across a way if I change to use p:out…




















Post a Comment









Read more




























AngularJS - Build a custom validation directive for using multiple emails in textarea




























AngularJS already supports the built-in validation with text input with type email. Something simple likes the following:

<input name="input" ng-model="email.text" required="" type="email" />
<span class="error" ng-show="myForm.input.$error.email">
        Not valid email!</span>


However, I used a text area and I wanted to enter some email addresses that's saparated by a comma (,). I had a short research and it looked like AngualarJS has not supported this functionality so far. Therefore, I needed to build a custom directive that I could add my own validation functions. My validation was done only on client side, so I used the $validators object.


Note that, there is the $asyncValidators object which handles asynchronous validation, such as making an $http request to the backend.


This is just my implementation on my project. In order to understand that, I supposed you already had experiences with Angular…




















5 comments









Read more