Tagged articles

Thread Safety

233 articles · Page 3 of 3

May 12, 2019 · Backend Development

Why SimpleDateFormat Breaks in Multithreaded Java and How to Fix It

This article explains why the classic Java SimpleDateFormat class is not thread‑safe, demonstrates the problems caused by using a static instance in concurrent code, and presents four practical solutions—including creating new instances, synchronizing, using ThreadLocal, and switching to the immutable DateTimeFormatter.

DateTimeFormatterSimpleDateFormatThread Safety

0 likes · 8 min read

Why SimpleDateFormat Breaks in Multithreaded Java and How to Fix It

Java Captain

May 5, 2019 · Fundamentals

Understanding Thread Safety: Memory Isolation, ThreadLocal, Locks, and CAS in Java

The article explains why thread safety concerns memory rather than threads, describes how local stack variables, ThreadLocal, locks, and CAS provide isolation and consistency in Java concurrency, and compares optimistic and pessimistic locking strategies with illustrative code examples.

CASLocksThread Safety

0 likes · 15 min read

Understanding Thread Safety: Memory Isolation, ThreadLocal, Locks, and CAS in Java

NetEase Game Operations Platform

Mar 23, 2019 · Backend Development

Implementing a Redis‑Based Distributed Lock to Ensure Data Consistency in a CMDB System

This article analyzes data‑inconsistency problems caused by concurrent multithreaded updates in a CMDB system and presents a step‑by‑step exploration of synchronization solutions, ultimately implementing a robust Redis‑backed distributed lock in Python to guarantee atomic reads and writes while handling edge cases such as crashes and lock expiration.

CMDBData ConsistencyPython

0 likes · 17 min read

Implementing a Redis‑Based Distributed Lock to Ensure Data Consistency in a CMDB System

Java Backend Technology

Mar 19, 2019 · Backend Development

Why SimpleDateFormat Is Not Thread‑Safe and How to Fix It in Java

This article explains why Java's SimpleDateFormat is not thread‑safe, demonstrates the problems caused by using a static instance in multithreaded code, and presents four practical solutions—including synchronized blocks, ThreadLocal, and the modern DateTimeFormatter—to ensure correct date handling.

DateTimeFormatterSimpleDateFormatThread Safety

0 likes · 5 min read

Why SimpleDateFormat Is Not Thread‑Safe and How to Fix It in Java

Big Data Technology & Architecture

Feb 16, 2019 · Fundamentals

Understanding ConcurrentSkipListSet in Java: Overview, Principles, API, and Example

This article explains the thread‑safe, ordered Java collection ConcurrentSkipListSet, compares it with TreeSet, describes its skip‑list based internal structure, lists its full API, and provides a multithreaded example demonstrating correct concurrent usage versus the failure of TreeSet.

Concurrent CollectionsConcurrentSkipListSetData Structures

0 likes · 8 min read

Understanding ConcurrentSkipListSet in Java: Overview, Principles, API, and Example

Full-Stack Internet Architecture

Oct 17, 2018 · Backend Development

Understanding CopyOnWriteArrayList in Java: Implementation, Principles, and Comparison with ArrayList

CopyOnWriteArrayList is a thread‑safe variant of ArrayList that achieves read‑write separation by copying the underlying array on each mutative operation, using a ReentrantLock for writes, making it ideal for read‑heavy, write‑light scenarios, and it differs from ArrayList in safety, performance, and concurrency behavior.

CopyOnWriteArrayListData StructuresThread Safety

0 likes · 5 min read

Understanding CopyOnWriteArrayList in Java: Implementation, Principles, and Comparison with ArrayList

Java Captain

Sep 12, 2018 · Fundamentals

Understanding Processes, Threads, Multithreading, and Thread Safety in Java

This article explains the fundamentals of processes, threads, and multithreading in Java, illustrates common thread‑safety problems with example code, and demonstrates how to achieve safe concurrent execution using synchronized blocks and the Lock API, including tryLock with timeout.

LockThread Safetyjava

0 likes · 11 min read

Understanding Processes, Threads, Multithreading, and Thread Safety in Java

Xianyu Technology

Aug 28, 2018 · Mobile Development

Understanding Flutter Platform Channel Working Principles

The article explains Flutter’s platform channels—BasicMessageChannel, MethodChannel, and EventChannel—detailing their components (name, messenger, codec), how messages are encoded, decoded, and routed via BinaryMessenger, the various codecs and handlers, and considerations for thread safety, large data transfer, and practical usage.

Platform ChannelThread Safetyflutter

0 likes · 14 min read

Understanding Flutter Platform Channel Working Principles

Senior Brother's Insights

Aug 23, 2018 · Fundamentals

Mastering the Singleton Pattern in Java: Eager, Lazy, Double‑Check, and More

Explore the GOF 23 design patterns with a deep dive into the Singleton pattern, covering its purpose, characteristics, comparison to static classes, and multiple Java implementations—including eager, lazy, double‑checked locking, volatile, static inner class, and enum approaches—plus Spring’s real‑world usage.

Design PatternsEnumSpring

0 likes · 12 min read

Mastering the Singleton Pattern in Java: Eager, Lazy, Double‑Check, and More

Architecture Digest

Aug 12, 2018 · Fundamentals

Understanding the “Hardest” Java Interview Question and Thread‑Safety Fundamentals

This article presents a notoriously tricky Java interview problem, walks through its multithreaded code, explains the possible outputs, and then expands into a comprehensive discussion of thread‑safety concepts, synchronization mechanisms, and best practices for writing safe concurrent Java programs.

Interview QuestionThread Safetyjava

0 likes · 14 min read

Understanding the “Hardest” Java Interview Question and Thread‑Safety Fundamentals

Programmer DD

Jul 18, 2018 · Backend Development

How Does Java’s ConcurrentLinkedQueue Achieve Lock‑Free Thread Safety?

This article explains the lock‑free design of Java's ConcurrentLinkedQueue, detailing its core invariants, the internal Node structure, and step‑by‑step analyses of the offer and poll methods with code snippets and visual illustrations to demystify its CAS‑based concurrency mechanisms.

CASConcurrentLinkedQueueLock-Free

0 likes · 13 min read

How Does Java’s ConcurrentLinkedQueue Achieve Lock‑Free Thread Safety?

Programmer DD

Jun 21, 2018 · Fundamentals

Master Java Interview Essentials: 8 Classic Questions Explained

This article breaks down eight core Java interview questions, offering deep analysis of platform fundamentals, exception handling, reflection, I/O, concurrency, and object‑oriented design to help candidates demonstrate solid understanding beyond superficial answers.

Core ConceptsException HandlingIO

0 likes · 12 min read

Master Java Interview Essentials: 8 Classic Questions Explained

dbaplus Community

Jun 12, 2018 · Fundamentals

Master Java Concurrency: Memory Model, Atomic Operations, and Thread Pools Explained

This article walks through Java's concurrency fundamentals, covering the Java Memory Model, thread communication, atomic classes, synchronization techniques, safe object publication, and practical thread‑pool usage, while highlighting common pitfalls and performance considerations.

Thread SafetyThreadPoolatomic

0 likes · 25 min read

Master Java Concurrency: Memory Model, Atomic Operations, and Thread Pools Explained

Programmer DD

Jun 2, 2018 · Fundamentals

Unlocking Java’s Happens‑Before: When Do Thread Changes Become Visible?

The article explains the Java Memory Model’s happens‑before principle, detailing its eight core rules, how they ensure visibility and ordering across threads, provides code examples, analyzes a non‑thread‑safe snippet, and shows how to achieve safety using locks or volatile variables.

Memory ModelThread Safetyconcurrency

0 likes · 9 min read

Unlocking Java’s Happens‑Before: When Do Thread Changes Become Visible?

Java Backend Technology

May 28, 2018 · Backend Development

How to Safely Access the HttpServletRequest in Spring MVC: 5 Proven Methods

This article explains various ways to obtain the HttpServletRequest object in a Spring MVC web application, evaluates their thread‑safety through concurrent testing, and compares the advantages and drawbacks of each approach to help developers choose the most efficient solution.

HttpServletRequestThread Safetydependency injection

0 likes · 12 min read

How to Safely Access the HttpServletRequest in Spring MVC: 5 Proven Methods

Java Backend Technology

Apr 17, 2018 · Backend Development

Mastering the Singleton Pattern in Java: Eager, Lazy, and Thread‑Safe Implementations

This article explains the concept of design patterns and dives deep into the Singleton pattern in Java, covering its purpose, eager and lazy implementations, thread‑safety challenges, double‑checked locking, volatile usage, static inner class, and enum approaches, while illustrating each with clear code examples and diagrams.

Design PatternDouble-Check LockingEnum

0 likes · 11 min read

Mastering the Singleton Pattern in Java: Eager, Lazy, and Thread‑Safe Implementations

Beike Product & Technology

Mar 16, 2018 · Backend Development

Investigating a Java Heap Memory Issue: A Detective Story of Debugging and Root Cause Analysis

This article narrates a step‑by‑step investigation of a Java server whose heap memory exceeded 95%, detailing log collection, tool usage, thread analysis, and ultimately uncovering a thread‑unsafe SimpleDateFormat that caused an infinite loop and massive memory consumption.

SimpleDateFormatThread Safetyheap memory

0 likes · 15 min read

Investigating a Java Heap Memory Issue: A Detective Story of Debugging and Root Cause Analysis

Java Captain

Mar 13, 2018 · Backend Development

Servlet Overview: Introduction, Lifecycle, Eclipse Development, URL Mapping, and Thread Safety

This article provides a comprehensive tutorial on Java Servlets, covering their purpose, lifecycle, creation in Eclipse, configuration of web.xml mappings, URL pattern rules, default servlet behavior, thread‑safety concerns, synchronization techniques, and the deprecated SingleThreadModel approach.

EclipseServletThread Safety

0 likes · 20 min read

Servlet Overview: Introduction, Lifecycle, Eclipse Development, URL Mapping, and Thread Safety

Java Backend Technology

Mar 4, 2018 · Backend Development

Why is DefaultSqlSession Not Thread‑Safe and How Does SqlSessionTemplate Ensure Safety?

This article examines the thread‑unsafe nature of MyBatis's DefaultSqlSession, explains how SqlSessionTemplate and SqlSessionManager use proxy and ThreadLocal mechanisms to provide safe database access in Spring‑integrated environments, and presents related interview questions for deeper understanding.

Java PersistenceMyBatisSqlSession

0 likes · 7 min read

Why is DefaultSqlSession Not Thread‑Safe and How Does SqlSessionTemplate Ensure Safety?

Java Captain

Feb 11, 2018 · Backend Development

Analyzing Java Concurrency Models: CopyOnWriteArrayList, ConcurrentHashMap, and LinkedBlockingQueue

This article examines three Java concurrency implementations—CopyOnWriteArrayList, ConcurrentHashMap, and LinkedBlockingQueue—explaining their underlying principles, code structures, and how they achieve thread‑safe read/write operations using techniques such as copy‑on‑write, CAS, and separate locks.

CASConcurrentHashMapCopyOnWriteArrayList

0 likes · 13 min read

Analyzing Java Concurrency Models: CopyOnWriteArrayList, ConcurrentHashMap, and LinkedBlockingQueue

Programmer DD

Dec 6, 2017 · Fundamentals

Mastering Java Singleton: From Lazy Initialization to Enum with Thread‑Safety

This article walks through multiple Java Singleton implementations—lazy initialization, double‑checked locking, volatile‑protected, static‑inner‑class, and enum—explaining their thread‑safety characteristics, the pitfalls of instruction reordering, and how reflection and serialization can break or preserve the pattern.

Design PatternEnumThread Safety

0 likes · 10 min read

Mastering Java Singleton: From Lazy Initialization to Enum with Thread‑Safety

Senior Brother's Insights

Dec 4, 2017 · Fundamentals

Mastering Thread‑Safe Singleton in Java: Double‑Check, Static Holder, Enum & Reflection Hacks

Explore multiple Java singleton implementations—including a thread‑safe double‑checked locking version, a static inner‑class approach, an enum‑based solution, and a reflection‑based attack—while learning their key technical details, advantages, pitfalls, and how to protect against serialization and reflection vulnerabilities.

Design PatternEnumThread Safety

0 likes · 6 min read

Mastering Thread‑Safe Singleton in Java: Double‑Check, Static Holder, Enum & Reflection Hacks

Java Captain

Nov 13, 2017 · Fundamentals

Understanding the Singleton Design Pattern in Java: Implementations, Thread Safety, and Best Practices

This article explains the Singleton design pattern in Java, covering its definition, lazy and eager implementations, thread‑safety issues such as double‑checked locking and volatile, and alternative approaches like static inner classes and enums, providing code examples and practical insights.

Design PatternThread Safetydouble-checked locking

0 likes · 14 min read

Understanding the Singleton Design Pattern in Java: Implementations, Thread Safety, and Best Practices

BiCaiJia Technology Team

Aug 20, 2017 · Fundamentals

Understanding Java synchronized: Preventing Thread‑Unsafe Dirty Reads

This article explains how unsynchronized access to instance variables can cause dirty reads in multithreaded Java programs, demonstrates the issue with sample code, shows how adding the synchronized keyword resolves it, and explores the behavior when multiple objects each hold their own lock.

Dirty ReadThread Safetyconcurrency

0 likes · 5 min read

Understanding Java synchronized: Preventing Thread‑Unsafe Dirty Reads

Tencent TDS Service

Mar 9, 2017 · Mobile Development

Mastering the Singleton Pattern in Android: Pitfalls, Best Practices, and Real‑World Implementations

This article explores the Singleton design pattern in depth, covering its definition, various Java implementations, thread‑safety concerns, serialization, reflection and cloning pitfalls, Android‑specific considerations, and practical recommendations for using singletons effectively in mobile projects.

Design PatternEnumThread Safety

0 likes · 38 min read

Mastering the Singleton Pattern in Android: Pitfalls, Best Practices, and Real‑World Implementations

ZhiKe AI

Feb 23, 2017 · Fundamentals

Why volatile Is Not Thread‑Safe: A Java Increment Test

The article presents a Java program where 100 threads each increment a volatile int 1,000 times, showing that the final value may be less than the expected 100,000, and explains that volatile only guarantees visibility, not atomicity, making it unsuitable for concurrent modifications.

AtomicityThread SafetyVolatile

0 likes · 2 min read

Why volatile Is Not Thread‑Safe: A Java Increment Test

ITPUB

Oct 11, 2016 · Databases

How a Simple MySQL UPDATE Solved a Multi‑Threaded Counting Problem

A developer recounts how a seemingly trivial MySQL UPDATE statement—‘UPDATE table_name SET sum = sum + 5 WHERE id = 1’—proved thread‑safe for aggregating file counts across a multi‑threaded module, highlighting the importance of knowledge reserves and cautious evaluation before implementing complex synchronization solutions.

DatabaseMySQLSQL

0 likes · 5 min read

How a Simple MySQL UPDATE Solved a Multi‑Threaded Counting Problem

Hujiang Technology

May 27, 2016 · Mobile Development

Understanding Context Design in Objective‑C: Concepts, Nested Contexts, Thread Safety, and an Event Bus Example

This article explains the concept of a software context, discusses design considerations such as nesting and thread‑safety, and provides a concrete Objective‑C implementation including a lightweight event‑bus library, helping developers apply context patterns in mobile applications.

Objective‑CThread Safetycontext

0 likes · 8 min read

Understanding Context Design in Objective‑C: Concepts, Nested Contexts, Thread Safety, and an Event Bus Example

21CTO

Mar 26, 2016 · Fundamentals

How a Custom Linux‑Based Distributed File System Achieves Scalability and Consistency

This article describes the design and implementation of a Linux‑based distributed file system (DFS) that targets large‑scale data storage and access, detailing its architecture, goals, storage model, consistency mechanisms, thread‑safety approach, synchronization strategies, and recovery processes to ensure high availability and data integrity.

DFS designDistributed File SystemLinux storage

0 likes · 35 min read

How a Custom Linux‑Based Distributed File System Achieves Scalability and Consistency

21CTO

Mar 20, 2016 · Backend Development

Mastering Thread Safety in Java: When and How to Use synchronized

Thread safety issues arise when multiple threads access shared resources like variables, objects, or databases, potentially causing duplicate data or errors; this article explains when such problems occur and demonstrates how Java’s synchronized methods, synchronized blocks, and lock mechanisms can ensure safe, serialized access.

Thread Safetyjavamultithreading

0 likes · 12 min read

Mastering Thread Safety in Java: When and How to Use synchronized

Architect

Nov 2, 2015 · Backend Development

Handling Overselling in High‑Concurrency Scenarios: Pessimistic, FIFO, and Optimistic Lock Strategies

The article explains why overselling occurs in flash‑sale systems under high concurrency, analyzes the drawbacks of pessimistic locking and FIFO queues, and presents optimistic locking with version control as a more efficient solution for ensuring thread‑safe inventory updates.

FIFO queueThread Safetybackend

0 likes · 5 min read

Handling Overselling in High‑Concurrency Scenarios: Pessimistic, FIFO, and Optimistic Lock Strategies

Art of Distributed System Architecture Design

May 19, 2015 · Fundamentals

Why the Singleton Pattern Matters: Lazy Loading, Thread Safety, and Real‑World Java Examples

This article explains the Singleton design pattern in Java, illustrates why a single instance is essential for configuration classes, compares eager and lazy initialization, shows thread‑safe implementations, and demonstrates extensions that limit the number of instances with practical code samples.

Design PatternThread Safetyjava

0 likes · 12 min read

Why the Singleton Pattern Matters: Lazy Loading, Thread Safety, and Real‑World Java Examples

Qunar Tech Salon

Feb 20, 2015 · Backend Development

Overview of How Web Servers Work and the Role of Java Servlets

This article explains the fundamentals of web servers, application servers, and web containers, describes the Java Servlet API—including Servlet, ServletContext, ServletRequest, ServletResponse, and session handling—and provides guidance on thread safety with illustrative code examples.

HTTPServletThread Safety

0 likes · 11 min read

Overview of How Web Servers Work and the Role of Java Servlets