JSF Life Cycle

23:14 Unknown 0 Comments

      JSF life cycle consist of following phases,

Ø  Restore view phase
Ø  Apply request values phase
Ø  Process validations phase
Ø   Update model values phase
Ø  Invoke application phase
Ø  Render response phase




1. Restore view phase

JSF begins the restore view phase as soon as a link or a button is clicked and JSF receives a request. During this phase, the JSF builds the view, wires event handlers and validators to UI components and saves the view in the FacesContext instance. The FacesContext instance will now contains all the information required to process a request.

2. Apply request values phase
After the component tree is created/restored, each component in component tree uses decode method to extract its new value from the request parameters. Component stores this value. If the conversion fails, an error message is generated and queued on FacesContext. This message will be displayed during the render response phase, along with any validation errors.
3. Process validations phase
During this phase, the JSF processes all validators registered on component tree. It examines the component attribute rules for the validation and compares these rules to the local value stored for the component.
4. Update model values phase
After the JSF checks that the data is valid, it walks over the component tree and set the corresponding server-side object properties to the components' local values. The JSF will update the bean properties corresponding to input component's value attribute.
5. Invoke Application Phase
During this phase, the JSF handles any application-level events, such as submitting a form / linking to another page.
6. Render response phase
During this phase, the JSF asks container/application server to render the page if the application is using JSP pages. For initial request, the components represented on the page will be added to the component tree as the JSP container executes the page. If this is not an initial request, the component tree is already built so components need not to be added again. In either case, the components will render themselves as the JSP container/Application server traverses the tags in the page. After the content of the view is rendered, the response state is saved so that subsequent requests can access it and it is available to the restore view phase.

Reference:Book@tutorialspoint.com



0 comments:

How to write simple code in jsf with XHTML

04:17 Unknown 0 Comments

While writing code in jsf we are using

1.Xhtml front end design code.
2.Bean class in java.

1.Simply we are writing code as
Example :
<html>
<head>
< title>Test Jsf page<title>
</head>
<body>
Hello #{test.name}
<body>
</html>
Save with .xhtml extension


2.Java Bean Class
This class is nothing but reusable component class.It uses annotation(@) to provide additional information about class.
For above example :

@Name("test")
public class Test
{

  private String name="Robot";

  public void setName(String Name)
  {
       this.name=Name;
  }

  public String getName()
  {
       return name;
  }

}


Here  #{test.name} represents expression in JSF which maps front end value with java bean class.





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