How should filters be configured to apply only to certain URL patterns in a web application?
- Configure in the web.xml file
- Filters automatically apply to all URLs
- Specify URL patterns in the filter mapping in the deployment descriptor
- Use annotations in the filter class
Filters should be configured to apply only to certain URL patterns by specifying those patterns in the filter mapping in the deployment descriptor (web.xml).
Which method is used to get a reference to the ServletContext?
- getContext()
- getServletConfig()
- getServletContext()
- init()
The getServletContext() method is used to obtain a reference to the ServletContext. It is typically called within a servlet using the this.getServletContext() or getServletContext() to access the context information.
What type of listener is used to monitor changes in ServletContext attributes?
- HttpSessionAttributeListener
- HttpSessionListener
- ServletContextAttributeListener
- ServletRequestListener
The ServletContextAttributeListener is used to monitor changes in ServletContext attributes.
Which listener interface is implemented to track session creation and destruction?
- HttpSessionListener
- ServletContextAttributeListener
- ServletContextListener
- ServletRequestListener
The HttpSessionListener interface is implemented to track session creation and destruction events in servlets.
For which purpose is the ServletRequestListener used in servlets?
- To listen for request attribute changes
- To monitor session attribute changes
- To track changes in ServletContext attributes
- To track session creation and destruction
The ServletRequestListener is used in servlets to listen for changes in request attributes.
What is the use of HttpSessionBindingListener in the context of servlets?
- To listen for changes in the session attributes
- To listen for changes in the session creation
- To listen for changes in the session destruction
- To listen for changes in the session timeout
The HttpSessionBindingListener is used to listen for changes in the session attributes and is notified when an attribute is added, removed, or replaced in the HttpSession object.
How can you track attribute changes in the HttpSession object?
- Use HttpSessionAttributeListener
- Use HttpSessionBindingListener
- Use HttpSessionEvent
- Use HttpSessionListener
You can track attribute changes in the HttpSession object by implementing the HttpSessionBindingListener interface, which provides methods to be notified when attributes are added, removed, or replaced.
What is the difference between ServletContextListener and ServletContextAttributeListener?
- Both can be used to listen to events in the ServletContext.
- ServletContextAttributeListener listens to changes in the ServletContext, while ServletContextListener specifically listens to attribute changes in the ServletContext.
- ServletContextListener listens to changes in the ServletContext, while ServletContextAttributeListener specifically listens to attribute changes in the ServletContext.
- They serve the same purpose and can be used interchangeably.
ServletContextListener is used to detect changes in the ServletContext, whereas ServletContextAttributeListener focuses on changes in attributes within the ServletContext.
How does the HttpSessionActivationListener interface help in servlets?
- It is used to activate and deactivate sessions in the HttpSession.
- It is used to listen to attribute changes in the HttpSession.
- It is used to listen to session activation and passivation events.
- It is used to manage session IDs in the HttpSession.
The HttpSessionActivationListener interface is specifically designed to listen to session activation and passivation events, allowing servlets to perform tasks when sessions are activated or passivated.
In which scenario would you use HttpSessionIdListener?
- To customize the session ID generation process.
- To manage session activation and passivation.
- To monitor changes in session attributes.
- To track the creation and destruction of sessions.
HttpSessionIdListener is used in scenarios where you want to customize the session ID generation process in servlets. It provides a way to influence how session IDs are created and assigned to user sessions.