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.
What are the security concerns to consider while implementing file upload in servlets?
- All of the above
- Checking file size
- Securing file storage location
- Validating file types
When implementing file upload in servlets, it's crucial to consider security concerns such as validating file types, checking file size, and securing the file storage location to prevent vulnerabilities.
How can a servlet efficiently handle large file uploads without running out of memory?
- Compress the file
- Increase heap memory
- Split the file into chunks
- Use streaming API
To handle large file uploads efficiently, a servlet can use streaming APIs to process the file in smaller chunks, avoiding memory overflow. Increasing heap memory may not be a scalable solution, and splitting the file into chunks is a better approach.
What is the role of the Content-Disposition header in file downloading?
- Indicates the file size
- Manages file encryption
- Prompts for download
- Specifies the file type
The Content-Disposition header plays a crucial role in file downloading by prompting the browser to download the file instead of displaying it. It specifies the disposition of the content, ensuring a proper download experience for users.