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.
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.
How does the 'String Pool' in Java affect memory management?
- Improved thread safety
- Increased memory consumption
- No impact on memory
- Reduced memory usage
The 'String Pool' in Java reduces memory usage by reusing existing string literals, thus decreasing the overall memory footprint and enhancing memory management efficiency.
In Java, the __________ collector is used for young generation garbage collection.
- CMS
- G1
- Parallel
- Serial
In Java, the Parallel collector is used for young generation garbage collection.