Java Concurrency in Practice

Introduction

The book "Java Concurrency in Practice" (authors: Brian Goetz, Tim Peierls, Joshua Bloch, et al.) is, without exaggeration, the bible of multithreaded programming in Java. Published in 2006, it remains the most authoritative and in-depth source of knowledge on concurrency in the Java ecosystem. Despite nearly two decades having passed since its publication, the fundamental principles described in the book have not become outdated: the Java Memory Model (JMM), issues of visibility, atomicity, ordering, as well as patterns for safe object publication, remain relevant today.

The book is not an introduction to Java from scratch — it assumes confident command of the language and a basic understanding of threads. However, it is precisely this book that transforms a developer from a "user of threads" into a true expert capable of designing reliable, scalable, and thread-safe applications.

What This Book Is About

"Java Concurrency in Practice" covers all key aspects of parallel programming in Java — from low-level synchronization mechanisms to high-level abstractions from the java.util.concurrent package. The book is logically structured: it first explains the basic problems of multithreading (race conditions, deadlocks, visibility issues), then examines tools for solving them — synchronized, volatile, final, atomic variables, ReentrantLock locks, semaphores, barriers. Separate chapters are devoted to testing multithreaded code, performance and scalability, as well as advanced topics such as Fork-Join and CompletionService.

Special attention is paid to the Java Memory Model (JMM) — understanding the JMM allows a developer to avoid hard-to-catch errors related to instruction reordering and data caching. The book contains many examples of "correct" and "incorrect" code, making the material clear and practical.

Who This Book Is For

The book is intended for experienced Java developers who have already encountered multithreading and want to systematize their knowledge. It will be useful for:

• Server application developers (web services, request processing, task queues);
• Specialists in high-load systems and low-latency applications;
• Architects designing scalable systems;
• Those preparing for technical interviews (especially at FAANG companies);
• Instructors and authors of Java courses.

Beginners may find the book challenging — it is recommended to first master the basics of multithreading from other sources (for example, "Thinking in Java" by Bruce Eckel or the official Oracle tutorials).

What the Reader Will Learn

• Basic problems of multithreading: race conditions, deadlocks, starvation, priority inversion.
• Thread safety: how to design classes that work correctly when accessed from multiple threads.
• Java Memory Model (JMM): happens-before rules, guarantees of visibility, atomicity, and ordering.
• Safe publication of objects: how to make an object visible to other threads without violating integrity.
• Synchronization tools: synchronized, volatile, ReentrantLock, ReadWriteLock, StampedLock.
• Atomic classes: AtomicInteger, AtomicReference, AtomicLong, AtomicReferenceFieldUpdater.
• Thread pools and Executor: ThreadPoolExecutor, ScheduledThreadPoolExecutor, ForkJoinPool.
• Collections for multithreading: ConcurrentHashMap, CopyOnWriteArrayList, BlockingQueue, ConcurrentLinkedQueue.
• Testing multithreaded code: how to write tests that detect races and deadlocks (including the use of Thread.yield() and synchronization primitives).