In-depth Java & Spring articles by Senior Java Developer Pavan Rangani — practical, production-grade tutorials and engineering deep-dives. 42 articles in this category.
August 18, 2026
You put an object into a HashSet, then ask if the set contains an equal object, and it says no. The culprit is almost always a broken equals and hashCode contract – the most common quiet bug in everyd… Read more
August 18, 2026
A process dies with OutOfMemoryError and restarts, and it will happen again. Heap dump analysis tells you what filled the heap: how to capture the dump automatically at the moment of death, and how to… Read more
August 18, 2026
One page load fires 200 queries and nobody notices until production. The N+1 query problem hides behind clean-looking code. Here is how it happens, how to catch it, and the four fixes with their hones… Read more
July 23, 2026
Annotating every service method with @Transactional is cargo cult. It holds database connections longer than needed, hides the boundary that actually matters, and silently does nothing when called fro… Read more
July 17, 2026
Java Flight Recorder ships in the JDK and profiles production JVMs at roughly 1% overhead. Learn custom event settings, JFR event streaming, jfr CLI triage, JDK Mission Control analysis, and how to ga… Read more
June 12, 2026
Spring Data JDBC maps domain-driven aggregates to relational tables without lazy loading or dirty tracking. Learn aggregate roots, value objects, @MappedCollection, optimistic locking, and when JDBC b… Read more
May 7, 2026
A deep dive into Java 25 value classes: flat memory layouts, identity-free semantics, and microbenchmarks showing 3-5x speedups over records for hot domain types.… Read more
April 7, 2026
Complete guide to building modular monoliths with Spring Modulith including module design, event-driven patterns, and future microservices migration paths.… Read more
April 6, 2026
Complete guide to migrating Spring Boot applications to version 4 with virtual threads and structured concurrency for massive throughput improvements.… Read more
March 26, 2026
Complete guide to building RAG-powered Java applications with Spring AI, PGVector, embedding models, and production-ready retrieval patterns.… Read more
March 26, 2026
A comprehensive guide to implementing Micrometer observability in Spring Boot applications with unified metrics, distributed tracing, and production-ready dashboards.… Read more
March 25, 2026
Complete guide to configuring GraalVM native build tools with Maven and Gradle, including reflection metadata, resource handling, and CI pipeline integration.… Read more
March 25, 2026
Deep dive into Project Reactor advanced operators covering backpressure strategies, error handling patterns, concurrency control, and production debugging techniques.… Read more
March 23, 2026
Complete guide to building event-driven modular monoliths with Spring Modulith including module boundaries, async events, and eventual microservice extraction paths.… Read more
March 22, 2026
Complete guide to using Testcontainers Cloud for Spring Boot integration testing with CI/CD pipelines, parallel execution, and cloud-based test infrastructure.… Read more
March 21, 2026
Complete guide to using Java records and sealed classes for domain modeling with pattern matching, algebraic data types, and type-safe business logic.… Read more
March 20, 2026
Complete guide to Spring Boot 4 AOT compilation and GraalVM native images with production patterns, performance benchmarks, and optimization strategies.… Read more
March 16, 2026
A practical comparison of Spring Boot virtual threads and reactive programming with benchmarks, migration strategies, and production decision frameworks.… Read more
March 10, 2026
Comprehensive guide to Java 23 pattern matching including sealed hierarchies, record deconstruction, guard clauses, and data-oriented programming patterns for production applications.… Read more
March 9, 2026
Comprehensive guide to testing Spring Boot native applications with GraalVM, covering AOT test slices, reflection hints, and compilation verification.… Read more
March 9, 2026
Complete guide to Spring Boot 4.0 new features and migration from 3.x including declarative clients, structured concurrency, and virtual threads.… Read more
March 9, 2026
Complete guide to Java 24 virtual threads with structured concurrency including TaskScope patterns, scoped values, and thread pool migration.… Read more
March 8, 2026
Master Java 22 pattern matching features including sealed types, record deconstruction, guarded patterns, and exhaustive switch expressions.… Read more
March 7, 2026
Develop supersonic Java applications with Quarkus framework using live coding, native compilation, and container-first design principles.… Read more
March 6, 2026
Start your Spring Boot journey with this beginner-friendly guide covering project setup, REST APIs, database integration, and deployment basics.… Read more
March 6, 2026
Compile Spring Boot applications to GraalVM native images for instant startup and reduced memory consumption in cloud-native deployments.… Read more
March 5, 2026
Configure Spring Cloud Gateway with reactive routing, custom filters, rate limiting, and circuit breaking for production microservices architectures.… Read more
March 4, 2026
Discover Jakarta EE 11 new features with CDI Lite, updated REST APIs, and streamlined enterprise Java development patterns.… Read more
March 2, 2026
Build cloud-native microservices with Micronaut using compile-time dependency injection, GraalVM native images, and sub-second startup times.… Read more
March 1, 2026
Compare Quarkus and Spring Boot for cloud-native Java applications with startup benchmarks, memory analysis, and GraalVM native image strategies.… Read more
February 28, 2026
Configure Spring Boot as an OAuth2 resource server with JWT validation, scope-based authorization, and custom decoders for production.… Read more
February 27, 2026
Build modular Spring Boot applications with Spring Modulith. Learn module boundaries, event-based communication, and documentation generation.… Read more
February 25, 2026
Discover how the Spring AI framework is transforming enterprise Java applications worldwide, bringing intelligent capabilities to millions of developers.… Read more
February 23, 2026
Optimize Spring Boot Docker images for production with multi-stage builds, JVM tuning, and container best practices that cut image size by 70%.… Read more
February 23, 2026
Eliminate N+1 queries, configure batch fetching, and optimize Spring Data JPA for high-throughput production applications.… Read more
February 18, 2026
Virtual threads are rewriting the rules of concurrent Java — handling millions of threads with simple blocking code. Here’s how to adopt them in production.… Read more
February 14, 2026
WebFlux reactive programming vs Project Loom virtual threads — benchmarks, DX comparison, and when to choose each.… Read more
February 11, 2026
Record patterns, sealed hierarchies, and switch expressions — modernize your Java codebase with pattern matching.… Read more
February 10, 2026
From ChatClient to RAG pipelines — a practical guide to integrating LLMs into your Spring Boot applications using the Spring AI framework.… Read more
February 8, 2026
Implement distributed tracing, metrics, and logging with OpenTelemetry auto-instrumentation in Spring Boot.… Read more
January 15, 2026
Practical caching strategies with Redis and Spring Boot — from @Cacheable basics to distributed cache stampede prevention in high-traffic systems.… Read more
February 15, 2025
A deep dive into patterns and practices that make Spring Boot applications resilient, maintainable, and performant in production environments.… Read more