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.
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.
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 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.
Which HTTP status code is typically sent by an HTTP servlet to indicate a successful response?
- 200 OK
- 302 Found
- 404 Not Found
- 500 Internal Server Error
The HTTP status code 200 OK is typically sent by an HTTP servlet to indicate a successful response. This status code signals that the request has been successfully processed, and the server is returning the requested resource.
To handle multiple file uploads, a servlet may use the __________ API.
- Java Authentication and Authorization Service (JAAS)
- Java Naming and Directory Interface (JNDI)
- JavaBeans Activation Framework (JAF)
- JavaMail
To handle multiple file uploads, a servlet may use the JavaBeans Activation Framework (JAF) API to work with various types of data, including files.
For secure file uploads, validating the __________ and __________ of the file is essential.
- file name, content
- file name, size
- file type, content
- file type, size
For secure file uploads, it's essential to validate both the file type and content to ensure the uploaded file is safe and meets the required criteria.
The response header __________ is crucial for indicating a file download rather than display.
- Content-Type
- File-Disposition
- File-Type
- Response-Content
The response header Content-Disposition is crucial for indicating a file download rather than display.
To read uploaded files in a servlet, the __________ method is commonly used.
- doGet()
- doPost()
- init()
- service()
To read uploaded files in a servlet, the doPost() method is commonly used.