¿Qué es el alcance de la solicitud en Java?

What is request scope in Java?

The request scope creates a bean instance for a single HTTP request, while the session scope creates a bean instance for an HTTP Session. The application scope creates the bean instance for the lifecycle of a ServletContext, and the websocket scope creates it for a particular WebSocket session.

Backing Beans are Java Beans Components associated with User Interface Components in a JSF Page. It contains Action methods, Action Listeners and Value Change listeners that correspond to the UI components that initiate action events.

Request scope begins when an HTTP request is received by a servlet and end when the servlet has delivered the HTTP response. With respect to the servlet life cycle, the request scope begins on entry to a servlet’s service() method and ends on the exit from that method.

Singleton: Only one instance will be created for a single bean definition per Spring IoC container and the same object will be shared for each request made for that bean. Prototype: A new instance will be created for a single bean definition every time a request is made for that bean.

1) BB: A backing bean is any bean that is referenced by a form. MB: A managed bean is a backing bean that has been registered with JSF (in faces-config. xml) and it automatically created (and optionally initialized) by JSF when it is needed.

JSF – Managed Beans

• @ManagedBean Annotation. @ManagedBean marks a bean to be a managed bean with the name specified in name attribute.
• Scope Annotations. Scope annotations set the scope into which the managed bean will be placed.
• @ManagedProperty Annotation. JSF is a simple static Dependency Injection (DI) framework.

• None: Objects with this scope are not visible in any JSF page. When used in the configuration file, they indicate managed beans that are used by other managed beans in the application. Objects with none scope can use other objects with none scope.

Request scope starts at the beginning of a request and ends when the response has been sent to the client. If the request is forwarded, the objects are visible cycle. Objects with request scope can use other objects with none, request, session, or application scope. belongs to a session. Objects with this scope have their state persisted between

You may know that when you use the standard action, you can specify similar scopes for the JavaBean. The difference is that JSP scope includes an additional scope named page. Because JSF requests often involve navigation between pages, objects with page scope have no value in a JSF application.

The difference is that JSP scope includes an additional scope named page. Because JSF requests often involve navigation between pages, objects with page scope have no value in a JSF application.