What is the primary purpose of the try-catch block in a servlet?
- Close connections
- Define methods
- Handle exceptions
- Initialize variables
The primary purpose of the try-catch block in a servlet is to handle exceptions that may occur during the execution of code within the block.
Which method is commonly used for logging in servlets?
- log()
- printLog()
- recordLog()
- writeLog()
The log() method is commonly used for logging in servlets. It allows servlets to log messages for debugging or informational purposes.
How does a servlet typically report an error back to the client?
- Print the error on the page
- Redirect to an error page
- Send an error code
- Throw an exception
A servlet typically reports an error back to the client by sending an error code using the sendError() method. This can be accompanied by an error message or a redirection to an error page.
How would a servlet handle a situation where both GET and POST requests need to be processed, but different actions are required for each?
- Combine GET and POST logic in a common method and use the @HttpMethod annotation to specify the request type.
- Delegate the handling of GET requests to another servlet and handle POST requests within the current servlet.
- Implement separate doGet()anddoPost() methods, each handling the respective request type.
- Use a single method (e.g., doProcess()) and differentiate between GET and POST requests within the method using conditional statements.
The correct approach is to implement separate doGet() and doPost() methods in the servlet, each handling the respective request type. This ensures clarity and adherence to the HTTP method semantics.
What is the significance of the web.xml file in handling servlet errors?
- It configures session handling
- It controls servlet access
- It defines error pages
- It sets servlet timeout
The web.xml file is significant in handling servlet errors as it defines error pages, specifying which HTML or JSP page should be displayed for different HTTP error codes.
How can a servlet differentiate between client errors (like 404) and server errors (like 500)?
- By analyzing the response object
- By checking the servlet context
- By examining the exception type
- By inspecting the request object
A servlet can differentiate between client errors (e.g., 404) and server errors (e.g., 500) by examining the type of exception that occurred, typically accessed through the exception handling mechanism.
Which Java interface is typically used for creating custom log messages in a servlet?
- ServletConfig
- ServletContext
- ServletLogger
- ServletRequest
The ServletContext interface is typically used for creating custom log messages in a servlet, providing methods for logging information that can be accessed across the servlet's entire application context.
_________ is a caching technique where frequently and recently accessed data is prioritized for caching.
- FIFO (First In, First Out)
- LRU (Least Recently Used)
- Optimal Replacement
- Random Replacement
LRU (Least Recently Used) is a caching technique where frequently and recently accessed data is prioritized for caching, aiming to keep the most relevant data in the cache.
Custom error pages in servlets are configured in the _________ file.
- config.xml
- custom-error.xml
- error-pages.xml
- web.xml
Custom error pages in servlets are configured in the web.xml file. This file allows you to specify error pages for different HTTP status codes, providing custom error handling in your web application.
Servlets can use the _________ interface to log application-level events.
- EventLog
- LogInterface
- Logging
- ServletLog
Servlets can use the Logging interface to log application-level events, providing a standardized way to record various log messages.