Servlets can be made thread-safe by making shared resources __________.
- abstract
- final
- synchronized
- volatile
Servlets can be made thread-safe by making shared resources synchronized, which ensures that only one thread can access the resource at a time.
Thread safety in servlets can be enhanced by using _________ scoped variables instead of instance variables.
- application
- page
- request
- session
Thread safety in servlets can be enhanced by using application scoped variables instead of instance variables. This ensures shared data is accessible to all users but is stored at the application level, reducing thread safety issues.
How can a server control the lifetime of a cookie in a client's browser?
- Setting the Domain attribute
- Setting the Expires attribute
- Setting the Max-Age attribute
- Setting the Path attribute
The server can control the lifetime of a cookie by setting the Max-Age attribute, specifying the maximum age of the cookie in seconds.
Which of the following is a common practice for ensuring thread safety in servlets?
- Avoiding the use of static variables
- Releasing all resources in the destroy() method
- Synchronization of the service() method
- Using a single shared resource in the servlet
A common practice for ensuring thread safety in servlets is avoiding the use of static variables, as they can lead to conflicts when multiple threads are accessing the servlet concurrently.
How can an HTTP servlet differentiate between GET and POST requests?
- Checking the request type in the doGet and doPost methods.
- The HTTP servlet cannot differentiate between GET and POST requests.
- Using the HttpServletRequest method getMethod()
- Using the requestType attribute in the web.xml file.
An HTTP servlet can differentiate between GET and POST requests by using the HttpServletRequest method getMethod(), which returns the HTTP method of the request (e.g., "GET" or "POST"). This allows the servlet to determine the type of request being made.
Which strategy involves adding more servers to handle increased load in a web application?
- Horizontal scaling
- Load balancing
- Session management
- Vertical scaling
Horizontal scaling involves adding more servers to handle increased load in a web application by distributing the load across multiple machines.
To avoid thread safety issues, it's recommended to use __________ instead of instance variables in servlets.
- final variables
- global variables
- local variables
- static variables
Using static variables is recommended in servlets to avoid thread safety issues, as they are shared among all instances of the servlet and are stored in a shared memory space.
The _________ method should be used carefully in servlets due to potential thread safety issues.
- destroy()
- doGet()
- init()
- service()
The service() method should be used carefully in servlets due to potential thread safety issues. It handles requests and might result in multiple threads accessing the servlet concurrently, requiring careful consideration for thread safety.
A thread-safe servlet ensures that shared data is accessed in a _________ manner.
- parallel
- random
- sequential
- synchronized
A thread-safe servlet ensures that shared data is accessed in a synchronized manner. This prevents multiple threads from accessing the shared data simultaneously, reducing the risk of data corruption and ensuring proper thread safety.
In HTTP servlets, the _________ method is used to send error responses back to the client.
- doError()
- errorResponse()
- handleError()
- sendError()
The sendError() method in HTTP servlets is used to send error responses back to the client, providing information about the encountered error.