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.
What is the primary purpose of garbage collection in Java?
- Accelerating compilation
- Enhancing network performance
- Freeing up memory
- Optimizing CPU usage
The primary purpose of garbage collection in Java is to free up memory by identifying and reclaiming the memory occupied by objects that are no longer reachable or in use.
In Java, which keyword is used to manually suggest the garbage collector?
- delete
- finalize
- free
- nullify
The finalize keyword in Java is used to manually suggest the garbage collector to consider an object for garbage collection.
Which of these is not a type of memory area in the Java Virtual Machine (JVM)?
- Cache
- Heap
- Registers
- Stack
Cache is not a type of memory area in the Java Virtual Machine (JVM). The primary memory areas in JVM include Heap, Stack, and Registers.
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.
What is the impact of setting a large size for the Java heap space?
- Decreased garbage collection
- Enhanced security
- Improved performance
- Increased memory allocation
Setting a large size for the Java heap space increases memory allocation, which can impact the application's performance, and may result in decreased garbage collection frequency.