To retrieve an AsyncContext object in a servlet, you use the __________ method of the HttpServletRequest.
- getAsyncContext()
- initAsync()
- retrieveAsync()
- startAsync()
To retrieve an AsyncContext object in a servlet, you use the getAsyncContext() method of the HttpServletRequest.
In asynchronous servlets, the __________ method of AsyncContext sends the response to the client.
- complete()
- finish()
- getResponseWriter()
- sendResponse()
In asynchronous servlets, the complete() method of AsyncContext is used to send the response to the client.
To add an AsyncListener to an AsyncContext, use the __________ method.
- addAsyncListener()
- addListener()
- attachListener()
- registerListener()
To add an AsyncListener to an AsyncContext, use the addAsyncListener() method.
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.
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.
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.
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.
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.
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.
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.