How does asynchronous processing affect the servlet's lifecycle?
- Extends the servlet lifecycle
- No impact on the servlet lifecycle
- Pauses the servlet lifecycle
- Shortens the servlet lifecycle
Asynchronous processing can extend the servlet lifecycle, as it allows tasks to continue beyond the usual request-response cycle, providing more flexibility in handling long-running operations.
What is the role of the AsyncListener in the servlet's asynchronous mode?
- Controlling servlet initialization
- Handling asynchronous errors
- Initiating asynchronous tasks
- Monitoring asynchronous operations
The AsyncListener plays a role in monitoring asynchronous operations, allowing developers to respond to events such as the start and completion of asynchronous tasks or handling errors in asynchronous processing.
How does asynchronous processing in servlets improve server resource utilization?
- Increases server load
- Increases thread blocking
- No impact on thread blocking
- Reduces thread blocking
Asynchronous processing reduces thread blocking, allowing the server to handle more requests without waiting for each to complete, thus improving resource utilization.
How can a servlet determine if an incoming request supports asynchronous processing?
- canAsyncProcess()
- isAsyncRequest()
- isAsyncSupported()
- supportsAsync()
The isAsyncSupported() method is used by a servlet to determine if an incoming request supports asynchronous processing.
What method is used to complete the asynchronous process and send a response?
- complete()
- finalize()
- finish()
- sendResponse()
The complete() method is used to complete the asynchronous process and send a response in asynchronous servlets.
For file download, what Content-Type should be set in the servlet response?
- application/json
- application/octet-stream
- image/png
- text/html
For file download, the Content-Type in the servlet response should be set to application/octet-stream to indicate that the response contains binary data without any specific format.
What is the primary interface used for file upload in servlets?
- FileHandler
- FileUpload
- ServletFileUpload
- UploadManager
The primary interface used for file upload in servlets is ServletFileUpload. It provides a simple way to parse and process HTTP requests with content type multipart/form-data.
Which method is typically used for file uploads in a servlet?
- doGet()
- doPost()
- init()
- service()
The doPost() method is typically used for file uploads in a servlet as it is designed to handle HTTP POST requests, commonly used for submitting forms and uploading files.
How would you handle errors and timeouts in an asynchronous servlet operation?
- Errors and timeouts are ignored in asynchronous operations.
- Handle errors centrally in the servlet by implementing error listeners.
- Throw exceptions from the servlet to handle errors.
- Use error handling within each asynchronous task.
Errors and timeouts in asynchronous servlet operations are typically handled within each task, allowing for specific error-handling strategies for each asynchronous process.
In a situation where multiple asynchronous tasks are initiated by a servlet, how is the completion of these tasks managed?
- Each asynchronous task manages its completion independently.
- The servlet prioritizes tasks based on their initiation order.
- The servlet waits for all tasks to complete before proceeding.
- The tasks are completed in a random order.
Each asynchronous task manages its completion independently, allowing them to finish in parallel without waiting for others to complete.
Consider a servlet that initiates a long-running task asynchronously. What happens to the request thread during this task?
- The request thread is blocked until the asynchronous task completes.
- The request thread is free to handle other requests.
- The request thread is paused indefinitely.
- The request thread is terminated.
In an asynchronous operation, the request thread is freed to handle other requests while the long-running task proceeds independently.
The __________ method of AsyncContext allows for manually controlling the timeout of an asynchronous operation.
- adjustTimeout()
- controlTimeout()
- setAsyncTimeout()
- setTimeout()
The setAsyncTimeout() method of AsyncContext allows for manually controlling the timeout of an asynchronous operation.