A web application implements a caching layer to reduce database load. Over time, the cache starts serving stale data. What caching strategy should be implemented to resolve this?
- Eviction Policies
- Lazy Loading
- Time-to-Live (TTL) caching
- Write-Through Caching
Implementing Time-to-Live (TTL) caching allows data to be cached for a specific duration, after which it is considered stale and refreshed, resolving the issue of serving stale data over time.
A high-traffic website uses a cache that frequently encounters 'cache churn'. What strategy can be used to minimize this effect?
- Bloom Filters
- Cache Sharding
- Least Recently Used (LRU) Caching
- Write-Behind Caching
Using Least Recently Used (LRU) caching strategy helps minimize cache churn by retaining frequently used items in the cache and discarding the least recently used ones, optimizing cache efficiency for a high-traffic website.
An online content platform uses caching to improve user experience. However, users in different regions report varying latency. What caching approach can be adopted to optimize for all users?
- Content Delivery Network (CDN) Caching
- Local Caching
- Proxy Caching
- Write-Through Caching
Adopting Content Delivery Network (CDN) caching helps optimize user experience for users in different regions by distributing cached content to edge servers, reducing latency and enhancing content delivery speed globally.
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.