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map vs flatMap in Java Explained with Real-World Examples
Learn the difference between map() and flatMap() in Java Streams with simple, complex, and real-world examples, including nested collections and Optional.
Java Wrapper Classes: Autoboxing, Unboxing, Integer Caching and Interview Questions
A complete guide to Java wrapper classes, autoboxing, unboxing, Integer.valueOf(), Integer caching, == vs equals(), String comparison, and common Java interview questions.
Spring Boot Actuator Custom Endpoints, Custom Metrics, Prometheus and Grafana Explained
Learn how Spring Boot Actuator, custom endpoints, Micrometer metrics, Prometheus and Grafana work together with real-world examples and interview questions.
Java Spring Boot Microservices Patterns and Actuator Explained with Real-World Examples
A beginner-friendly and interview-focused guide to Strangler Pattern, CQRS, Saga Pattern, Spring Boot Actuator, custom HealthIndicators, component scanning, and PostgreSQL with Docker.
ThreadLocal in Java Explained with Real-World Examples
Learn ThreadLocal in Java with simple and advanced examples. Understand ThreadLocal internals, ThreadLocalMap, object storage, collections, Spring Boot usage, and real-world applications.