Modern Java Development: The Complete Guide
From modern language features and virtual threads to Spring Boot microservices, testing, and native compilation.
Modern Language Features
Records, sealed classes, pattern matching, and the APIs that replaced legacy code.
Modern Java Features: A Practical Guide from Java 8 to 21
The features that changed Java: lambdas, streams, records, sealed classes, pattern matching, and virtual threads. Java 8 to 21.
Java Streams: Pipeline Internals, Performance Traps, and Production Patterns
Java streams: pipeline internals, where streams beat loops, parallel stream traps, and when to use collectors vs teeing.
Modern Java Collections: computeIfAbsent, Immutables, and Best Practices
Java collections: computeIfAbsent, getOrDefault, removeIf, immutables, and Comparator chains that eliminate entire bug categories.
Java Date and Time API: The Definitive Guide to java.time
Stop fighting java.util.Date. Master LocalDateTime, ZonedDateTime, Instant, and Duration — predictable, thread-safe time handling.
Concurrency & Performance
Virtual threads, CompletableFuture, and the JVM performance frontier.
Java Virtual Threads: Project Loom, Pinning Hazards, and Production Migration
Java 21 virtual threads: M:N scheduling, pinning hazards, ThreadLocal pitfalls, JFR detection, and what migration really takes.
Java CompletableFuture: Chaining Async Operations with thenCompose
thenCompose vs thenApply, running calls in parallel with allOf, timeouts, executor selection, and production error handling.
Go vs Java in 2026: An Honest Performance Comparison for Backend Services
An honest Java (Spring Boot) vs. Go (Gin) performance comparison under load tests in 2026. Comparing throughput, memory footprint, cold starts, and AWS costs.
Spring Ecosystem
Production Spring Boot patterns, REST microservices, and Spring AI.
Spring Boot REST: JPA, Validation, Exception Handling, and Testing
Production REST APIs with Spring Boot: JPA, Bean Validation, global exception handling, MockMvc testing, and scalable patterns.
Spring AI in Production: RAG Pipelines, Reliability, and Observability for Java Backends
Spring AI 1.1 deep-dive: production RAG pipeline with PII scrubbing, circuit breakers, Micrometer observability, and answer evaluation.
Architecture & Design
Design patterns, clean code principles, and native compilation.
Java Singleton Pattern: Thread-Safe, Reflection-Proof, Serialization-Safe
Java singletons: enum patterns, double-checked locking, and holder-classes — and when dependency injection is the better answer.
SOLID Principles in Production: From Code Smells to Architectural Discipline
SOLID beyond theory: real production anti-patterns, Spring Boot refactorings, and the design constraints that prevent codebase rot.
GraalVM Native Images in Production: From 5-Second Startup to 50ms
From 5-second Spring Boot cold starts to 50ms with GraalVM native images. The real gotchas, wins, and whether it's worth it.
Testing
JUnit 5, Mockito, and modern Java testing strategies.
