JSF is defined as a Java Based framework for building web based user interfaces. JSF stands for JavaServer Faces which acts as a standard Web application framework for Java EE. Few benefits of JSF are listed below:
- It allows the implementation of custom components.
- With JSF, users can easily transfer the data between UI components.
- It helps in managing the User Interface state across the multiple server requests.
Main objective of JSF is to build the web applications faster. JSF helps in the developer’s work by hiding the complexities. Two major components of JSF are as follows:
- JSF Files containing dynamic data which are modeled into POJO are known as JSF backing Beans. JSF server is used to manage the lifecycle of backing beans.
JSF creates the UI components in a View Page with the help of JSP custom Tag Library. JSF consist a Set of APIs to manage and represent the state of components. The most important advantage of using JSF is that users can use its basic UI components and additional components too. It minimizes the efforts of developers in creating and maintaining applications.
JSF application is quite similar to the java based web application. JSF mainly consists three parts which are given as:
- Java based Data Management
- For using components in any browser, it provides a set of UI components that can be converted into standard HTML tags.
- JSF consist a component model that allow third party developers to provide subsidiary components.
Lifecycle of JSF application includes six main phases which are listed below:
- Restore view phase: in this phase, JSF save the view in FacesContext instances and creates the event handlers, view and validators to the user interface components. After that, all the necessary information to process a request is contained by FacesContext.
- Apply request view phase: after creating the component tree, each component extract the new value from requested parameters by using decode method. This value is stored by the component and if the conversion fails, an error message is generated to the FacesContext instance.
- Process validation phase: in this phase, JSF examines the all registered validators with component attribute rules and compared these rules with the local value that is stored for the component. If value is invalid, JSF generates the error message to the FacesContext.
- Update model value phase: in this phase, JSF set the properties of server side object to the local value and update the bean properties which are similar to the input component’s value attribute.
- Invoke application phase: in this phase, application level events is handled by JSF such as linking to another page, form submission, etc.
- Render response phase: in this phase, if the application is using JSP pages, then it asks application server to render the page. For starting request, component tree adds the all components that are represented on the page.
Another major aspect of JSF is that is based on pattern of Model View Controller Design and it also follows few business standards. JSF with Model View Controller Design help users to use the new MVC framework easily.
JSF runs on a Java servlet container. There are two types of integration included in JSF:
- Spring integration: it provides a specific class to integrate the spring and JSF together, this class is named as DelegatingVariableResolver.
- JDBC integration: it used JDBC for integrated the database in JSF.
JSF Component Model enables third party to develop the reusable UI component libraries. For running the application, JSF uses a jar file. Some of its jar files are as follows:
JSFToolbox 4.5 is the latest advanced toolbox of JSF. It allows the Java developers to create JavaServer faces with Web authoring tools. This tool involves many features such as EL support, dynamic code hints, etc. JSF2.3 is the upcoming version of JSF. Some of the advanced topics that involved in JSF are listed below:
- Apache MyFaces with AJAX
- Custom component development
- Ajax in JavaServer Faces application
- Integration with JSP applications
- Domain Controller
- Web Framework
- Web Server And service deployment
Moreover, JSF handles the resource bundle by using Internationalization technique in which GUI component tables and status messages are not embedded in the program.
Expressions in JSP can be simplified by a way which is provided by the Expression language. This language is used for accessing the implicit Java and Objects classes. These objects can be accessed by JavaBeans and Servlets.
For building the JavaServer Faces, JSF used a page declaration language which is known as Facelets. It creates the web pages by using XHTML. Facelets supports its own tag libraries and expression language.
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