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In a high-performance Java application, how should memory management be approached to prevent latency issues?

  • Frequent use of finalize method
  • Implement lazy loading for classes
  • Opt for a large heap size
  • Utilize efficient garbage collectors
Utilizing efficient garbage collectors is essential for high-performance applications. Implementing lazy loading, opting for a large heap size, and frequent use of the finalize method can lead to latency issues and should be avoided in performance-sensitive applications.
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What is the primary purpose of caching in web applications?

  • To add security
  • To design the user interface
  • To handle user authentication
  • To improve performance
The primary purpose of caching in web applications is to improve performance by storing frequently accessed data and reducing the need to fetch it from the original source repeatedly.
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Which caching strategy involves storing frequently accessed data in memory for quick retrieval?

  • Browser caching
  • Database caching
  • In-memory caching
  • Page caching
In-memory caching involves storing frequently accessed data in the system's memory, enabling quick retrieval and enhancing performance.
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Which HTTP header is commonly used to control cache behavior in web browsers?

  • Cache-Control
  • Content-Encoding
  • Expires
  • Last-Modified
The Cache-Control header is commonly used to control cache behavior in web browsers by specifying directives for caching mechanisms in both requests and responses.
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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.
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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.
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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.
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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.
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In the context of web applications, what does 'cache invalidation' refer to?

  • Clearing the browser cache
  • Encrypting cached data
  • Refreshing cached data
  • Storing data in cache
'Cache invalidation' in the context of web applications refers to the process of refreshing or clearing cached data to ensure that users receive the most up-to-date information from the server.
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What is the main difference between 'write-through' and 'write-back' caching strategies?

  • Write-through and write-back are terms used interchangeably.
  • Write-through and write-back caching strategies are essentially the same.
  • Write-through involves writing data to both the cache and the underlying storage immediately, while write-back involves writing to the cache first and updating the underlying storage at a later time.
  • Write-through involves writing data to the cache only, while write-back involves writing data to both the cache and the underlying storage simultaneously.
The main difference is that 'write-through' immediately updates both the cache and the underlying storage, while 'write-back' involves updating the cache first and delaying the update to the underlying storage.
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