Why is it important to close resources like database connections in servlets?
- All of the above
- To avoid memory leaks
- To conserve memory
- To improve performance
Closing resources like database connections is important to avoid memory leaks and ensure efficient memory usage in servlets.
How does using the PreparedStatement in servlets improve performance?
- PreparedStatements allow for batch processing.
- PreparedStatements are precompiled, reducing SQL parsing overhead.
- PreparedStatements are suitable for handling large datasets.
- PreparedStatements automatically manage database connections.
Using PreparedStatements in servlets improves performance as they are precompiled, reducing SQL parsing overhead, which leads to better execution speed.
How does the sendRedirect() method communicate the new URL to the client's browser?
- Via HTTP headers
- Via HTTP status code
- Via URL parameters
- Via server-side cookies
The sendRedirect() method communicates the new URL to the client's browser by sending an HTTP redirect response with the new URL in the HTTP headers.
What is the benefit of implementing the SingleThreadModel interface in servlets?
- Enhanced concurrent processing.
- Improved thread safety.
- Reduced memory consumption.
- Simplified servlet lifecycle.
Implementing the SingleThreadModel interface in servlets provides improved thread safety by ensuring that only one thread can execute the service method at a time, preventing concurrent access issues.
In a chat application using WebSockets, when a message is sent to a closed connection, what happens and how should it be handled?
- An error is thrown on the server-side.
- The WebSocket connection remains open for future messages.
- The client receives an error, and the server is notified.
- The message is silently discarded.
When a message is sent to a closed connection, the client should receive an error, and the server needs to be notified for proper handling and logging.
In HTTP servlets, which method is commonly used for handling form submissions?
- doGet()
- doPost()
- init()
- service()
The doPost() method in HTTP servlets is commonly used for handling form submissions as it is designed for processing data sent in the body of an HTTP POST request.
To minimize server load, servlets can implement _________ to handle asynchronous processing.
- Asynchronous Servlets
- Listeners
- Synchronization
- Threads
To minimize server load, servlets can implement Asynchronous Servlets to handle asynchronous processing and improve the overall scalability of the application.
Which HTTP method is idempotent and used primarily for retrieving data?
- DELETE
- GET
- POST
- PUT
The GET method is idempotent and is used primarily for retrieving data from the server.
Which of the following techniques is effective for reducing response time in servlets?
- Disabling servlet caching.
- Increasing the servlet buffer size.
- Minimizing the use of session objects.
- Using asynchronous processing.
Using asynchronous processing in servlets is effective for reducing response time by allowing the server to handle other tasks while waiting for I/O operations, leading to improved overall system responsiveness.
How does connection pooling in servlets optimize database interactions?
- By caching database query results
- By establishing a new connection for each request
- By increasing the size of the database
- By reusing existing database connections
Connection pooling optimizes database interactions by reusing existing database connections, reducing the overhead of establishing a new connection for each request.