To improve scalability, servlets can delegate database reads to ________ instances.
- Observer
- Singleton
- Stateful
- Stateless
To improve scalability, servlets can delegate database reads to Stateless instances, as they do not maintain client-specific state between method calls.
A servlet handling massive data queries is experiencing performance issues. What optimization technique should be prioritized?
- Caching results
- Increasing server hardware
- Minifying CSS and JavaScript files
- Optimizing database queries
Optimizing database queries would be a key strategy in this scenario, as it directly addresses the performance issues associated with handling massive data queries.
For a high-traffic web application, which servlet optimization strategy would best balance load?
- Implementing load balancing
- Increasing server cache size
- Minimizing session management
- Using a single server instance
Implementing load balancing is a key strategy to distribute the incoming traffic among multiple servers, ensuring a better balance and improved performance for a high-traffic web application.
In a resource-constrained environment, what servlet coding practice would you recommend to optimize memory usage?
- Disabling compression
- Increasing session timeout
- Reducing unnecessary object creation
- Using synchronous servlets
Reducing unnecessary object creation is a good practice to optimize memory usage in a resource-constrained environment, as it helps minimize the overhead associated with object allocation.
How does Java's heap memory management differ from stack memory management?
- Both heap and stack memory are used interchangeably.
- Heap and stack memory are the same in Java.
- Heap memory is used for dynamic memory allocation, and objects are stored in the heap. Stack memory is used for static memory allocation, and method calls and local variables are stored in the stack.
- Stack memory is used for dynamic memory allocation, and objects are stored in the stack. Heap memory is used for static memory allocation, and method calls and local variables are stored in the heap.
In Java, heap memory is used for dynamic memory allocation, and objects are stored in the heap, while stack memory is used for static memory allocation, storing method calls and local variables.
What is a memory leak in the context of Java programming?
- A memory leak occurs when a program allocates memory but forgets to deallocate it, leading to a gradual reduction in available memory.
- A memory leak occurs when a program deallocates memory properly, ensuring optimal memory usage.
- Memory leaks are intentionally created to enhance program performance.
- Memory leaks only occur in languages other than Java.
A memory leak in Java programming happens when the program allocates memory but forgets to deallocate it, resulting in a gradual reduction in available memory.
Can session tracking be implemented using hidden form fields?
- Depends on the browser
- No
- Possible only in HTTPS
- Yes
Session tracking can be implemented using hidden form fields by including the session identifier in the form, allowing it to be sent back to the server with each form submission.
The ServletContext is shared across multiple servlets within a __________.
- request
- server
- session
- web application
The ServletContext is shared across multiple servlets within a web application.
What is URL rewriting in the context of session tracking?
- Appending a random string to the URL for session identification.
- Creating a new URL for each session.
- Hiding session information in the URL.
- Modifying the URL to include session information.
URL rewriting in session tracking involves modifying the URL to include session information. This enables the server to identify the client's session when processing subsequent requests.
Which tool is commonly used for analyzing memory usage in Java applications?
- Eclipse
- Git
- JConsole
- NetBeans
JConsole is commonly used for analyzing memory usage in Java applications. It provides monitoring, troubleshooting, and profiling capabilities to understand the memory consumption of Java applications.