Overview

Java Concurrency in the Modern EraA Practical Guide to Multithreading, Virtual Threads & Structured Concurrency (Java 21-25) Modern systems demand throughput, low latency, and resilient concurrency. Yet writing correct, maintainable concurrent code has long been one of the hardest problems in software engineering. This book presents a clear, hands-on path through both the classic concurrency toolkit and the new model introduced by Project Loom-virtual threads, structured concurrency, and scoped values-so you can build systems that are simple, debuggable, and capable of massive scale. The narrative begins with fundamentals-why concurrency matters today, how the Java Memory Model affects correctness, and how to spot real bottlenecks in production. From there it moves quickly into practical engineering: tuned executor services, concurrent collections, synchronization pitfalls, and common anti-patterns you must recognize and avoid. Throughout, chapters pair concise explanation with runnable labs and real code, encouraging the ""learn by doing"" approach that ships results in production. What sets this book apart is its dual focus: you will learn to maintain and improve legacy, platform-thread systems while adopting the modern Java model where it helps most. Project Loom's virtual threads let you return to clear, blocking code without sacrificing scale; StructuredTaskScope and ScopedValue give you safe, leak-free task management and context propagation. The book shows when to use each tool, how to measure their impact with JMH and JFR, and how to design hybrid architectures that combine virtual threads with reactive or parallel models for optimal results. You will work through realistic projects and labs that demonstrate the full lifecycle of modern concurrency: building a high-throughput web server with virtual threads, migrating CompletableFuture chains to structured concurrency, creating robust testing and JCStress scenarios, and profiling pinning and contention with Java Flight Recorder. Each project closes with a post-mortem that explains the performance results and the architectural trade-offs-so you learn not just APIs, but professional judgement. You'll also gain the tools to lead migration efforts: checklists for deciding whether a task is I/O-bound or CPU-bound, step-by-step refactoring patterns, and guidance for safely introducing modern APIs into production. By the final chapter you'll understand the status and implications of Loom-related JEPs through Java 25 and be equipped with a pragmatic migration strategy that reduces risk while increasing maintainability and throughput. A few highlights you'll find inside: A lab-first pedagogy with runnable code and a companion GitHub repo arranged by chapter. Practical diagnostics: using JFR, jcmd, and JMH to find and fix real concurrency issues. Deep dives into the Java Memory Model, visibility bugs, and safe publication patterns. Design patterns and anti-patterns, with code reviews and refactors that show how to modernize legacy systems. Hands-on projects: virtual-thread web server, parallel file pipelines, and a concurrent distributed cache with performance post-mortems. Who this book is for: Java engineers, backend developers, and architects who need reliable, maintainable concurrency in modern production systems. Read this book to: stop guessing about performance, adopt the right concurrency model for each task, and design systems that scale elegantly with modern JVM capabilities. Whether you are maintaining platform-thread code or leading a migration to virtual threads and structured concurrency, this book arms you with practical techniques and engineering judgment to succeed.

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