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.
When is it necessary to consider thread safety in the development of a servlet?
- Always, whenever the servlet is handling concurrent requests
- Only when the servlet is handling file uploads
- When the servlet has static variables
- When the servlet is used in a single-threaded environment
It is necessary to consider thread safety in the development of a servlet whenever the servlet is handling concurrent requests to ensure that multiple threads can access the servlet without causing conflicts or data corruption.
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.
In a highly concurrent web application, how would you design a servlet to handle database connections securely and efficiently?
- Open a new database connection for each request.
- Store database connections as static variables.
- Use a connection pool to manage database connections.
- Use synchronized methods for database operations.
Using a connection pool is a best practice in highly concurrent applications as it efficiently manages and shares database connections, reducing the overhead of opening and closing connections for each request.
If a servlet manipulates a shared data structure, what must be done to ensure it operates correctly in a multithreaded environment?
- Avoid multithreading in servlets.
- Synchronize access to the shared data structure.
- Use multiple instances of the servlet.
- Use volatile keyword for the shared data structure.
Synchronizing access to the shared data structure is crucial in a multithreaded environment to prevent data corruption and ensure consistency. The synchronized keyword ensures that only one thread can access the shared data structure at a time.