Saquib Aftab ✓

[image] Embedded Servers in Spring Boot ✅ In older Java web apps, we usually build a WAR file and deploy it to an external server, such as a standalone Tomcat or JBoss. With Spring Boot, the server is embedded inside the application. The server libraries are bundled in the classpath

[image] Interview Question: Explain the internal working of HashMap? How does it handle collisions?

[image] Important Java Library #1: Apache Commons Lang 👉 ✅This library provides small helper utilities like StringUtils, ObjectUtils, and EqualsBuilder, which can save time and produce clean code.

[image] What causes a java.lang.OutOfMemoryError in Java?

[image] Java Interviewer: How do you create and start threads in Java? Answer: ✅There are three common approaches: - Extending Thread - Implementing Runnable - Using executors (including virtual thread executors)

[image] Understanding JVM Memory Areas ✅

[image] Spring Security Concepts: OAuth2 Resource Server ✅ With a single OAuth2ResourceServer declaration, Spring Security will: 1. Extract the Authorization: Bearer <token> header from every request 2. Validate the token’s signature against your Authorization Server’s public key

[image] ➡️Pagination is the technique which divides large datasets into smaller, manageable chunks. These chunks are called pages. Instead of fetching and displaying all data at once, we retrieve and show only the data a user needs right now. ✅ What are the benefits of pagination?

[image] ✅Garbage Collector in Java: Java gives us multiple GC options. Picking the right one depends on your latency and throughput requirements.

[image] Interview Questions on Java Concurrency ✅ ➡️ What is the real difference between volatile, synchronized, and atomic classes? ➡️ When would one be enough and when would you need the others? ➡️ How do visibility, atomicity, and ordering matter in multithreaded code?

[image] Factory vs Abstract Factory Design Pattern ✅️