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.
The __________ method can be used to get runtime information about memory usage.
- freeMemory()
- getMemoryInfo()
- maxMemory()
- totalMemory()
The maxMemory() method can be used to get runtime information about the maximum amount of memory that the Java Virtual Machine will attempt to use.
Memory leaks in Java often occur due to __________ objects not being released properly.
- finalized
- garbage collected
- reference-counted
- static
Memory leaks in Java often occur due to static objects not being released properly.
The __________ and __________ are two major parts of JVM memory structure.
- Cache, Register
- Heap, Stack
- Queue, Linked List
- Stack, Heap
The Heap and Stack are two major parts of the JVM memory structure. The Heap is used for dynamic memory allocation, while the Stack is used for static memory allocation and method call management.
A servlet forwards a request to a JSP page for rendering the view. Which method does it use, and what happens to the URL in the browser?
- request.getRequestDispatcher().forward()
- request.sendRedirect()
- response.forward()
- response.sendRedirect()
The correct method for forwarding a request to a JSP page is request.getRequestDispatcher().forward(). The URL in the browser remains the same as the original request URL.
The __________ area in JVM memory is used to store per-class structures.
- Class
- Heap
- Method
- Stack
The Class area in JVM memory is used to store per-class structures, such as class metadata, constants, and static fields.
A Java application experiences 'OutOfMemoryError'. What could be the potential causes and solutions?
- Implement caching mechanisms
- Increase heap size using -Xmx
- Optimize code for memory leaks
- Reduce the number of threads
'OutOfMemoryError' may occur due to memory leaks. Optimizing code, reducing threads, and implementing caching mechanisms are strategies to address this issue. Increasing heap size is a solution but doesn't address the root cause of the problem.