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Java Tech Workshop

Focused on Java backend technologies, sharing fundamentals, multithreading, JVM, the Spring ecosystem, microservices, distributed systems, high concurrency, source‑code analysis, and practical experience. Continuously delivers high‑quality original content, interview guides, and learning roadmaps to help Java developers progress from beginner to advanced, enhancing technical skills and core competitiveness.

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Latest from Java Tech Workshop

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Java Tech Workshop

Jun 21, 2026 · Backend Development

Mastering Spring’s BeanPostProcessor: The Ultimate Hook for Advanced Container Customization

Spring’s BeanPostProcessor is a global container hook that intercepts every bean’s lifecycle, enabling custom initialization, dynamic proxying, annotation processing, and resource cleanup; the article explains its three-tier hierarchy, execution order, priority rules, practical use‑cases like auto‑injection, logging, data masking, and common pitfalls.

AOPBeanPostProcessorDependency Injection

0 likes · 18 min read

Mastering Spring’s BeanPostProcessor: The Ultimate Hook for Advanced Container Customization

Java Tech Workshop

Jun 20, 2026 · Backend Development

How Custom Spring Converters Eliminate Date and Enum Parameter Pain Points

The article explains why front‑end date and enum parameters often cause parsing errors in Spring applications, describes the two independent conversion mechanisms in Spring MVC and Jackson, and provides a step‑by‑step guide to building global custom converters that unify date formats and enum mappings across the whole project.

Custom ConverterEnum MappingJackson

0 likes · 17 min read

How Custom Spring Converters Eliminate Date and Enum Parameter Pain Points

Java Tech Workshop

Jun 19, 2026 · Backend Development

BeanFactory vs ApplicationContext: The Real Differences You Must Know

The article explains how BeanFactory is a minimal, lazy‑loading container that only creates and caches beans, while ApplicationContext extends it with eager pre‑loading, full annotation, AOP, transaction, environment and event support, and outlines their respective use cases and pitfalls.

ApplicationContextBeanFactoryDependency Injection

0 likes · 9 min read

BeanFactory vs ApplicationContext: The Real Differences You Must Know

Java Tech Workshop

Jun 18, 2026 · Backend Development

Understanding @Lazy in Spring: Solving Circular Dependencies and Accelerating Startup

The article explains that Spring's @Lazy annotation has two distinct mechanisms—class‑level lazy bean creation and dependency‑level proxy placeholders—detailing how each works, when to apply them, common pitfalls such as transaction and aspect failures, and best‑practice scenarios for reducing startup time while safely handling circular dependencies.

@LazyBean ProxyLazy Initialization

0 likes · 12 min read

Understanding @Lazy in Spring: Solving Circular Dependencies and Accelerating Startup

Java Tech Workshop

Jun 17, 2026 · Backend Development

Step‑by‑Step Source Code Walkthrough of Spring’s Singleton Bean Creation

This article dissects Spring’s singleton bean creation process, explaining the three‑level cache system, the doGetBean and doCreateBean workflows, circular‑dependency handling, proxy generation timing, and common pitfalls such as multithreaded duplicate creation and hot‑deployment cache issues.

Bean LifecycleCacheJava

0 likes · 11 min read

Step‑by‑Step Source Code Walkthrough of Spring’s Singleton Bean Creation

Java Tech Workshop

Jun 16, 2026 · Backend Development

How Spring’s Third‑Level Cache Resolves Circular Dependencies

The article explains Spring’s three kinds of circular dependencies, the role of the first, second, and third‑level caches in the DefaultSingletonBeanRegistry, how the third‑level cache works with AOP proxies, why constructor injection cannot be solved, the @Lazy workaround, and the hidden bugs and best‑practice recommendations.

AOPBean LifecycleConstructor Injection

0 likes · 12 min read

How Spring’s Third‑Level Cache Resolves Circular Dependencies

Java Tech Workshop

Jun 15, 2026 · Backend Development

Understanding the Full Spring Bean Lifecycle: From Instantiation to Destruction

This article walks through the complete Spring Bean lifecycle—covering scanning, instantiation, dependency injection, initialization, AOP proxy creation, and destruction—while highlighting common pitfalls, the differences for prototype and lazy‑loaded beans, and practical debugging tips.

AOPBean LifecycleDependency Injection

0 likes · 10 min read

Understanding the Full Spring Bean Lifecycle: From Instantiation to Destruction

Java Tech Workshop

Jun 14, 2026 · Backend Development

Spring Bean Scopes: 5 Types, Common Pitfalls and Concurrency Gotchas

The article explains the five Spring Bean scopes, clarifies that scope only controls instance count and not thread safety, and walks through real‑world concurrency bugs such as mutable singleton fields, prototype beans losing their prototype nature, and request‑scoped beans failing in async threads, offering concrete fixes and usage recommendations.

Bean ScopeJavaSpring

0 likes · 10 min read

Spring Bean Scopes: 5 Types, Common Pitfalls and Concurrency Gotchas

Java Tech Workshop

Jun 13, 2026 · Backend Development

Which DI Injection Method Should You Use in Production? Field vs Setter vs Constructor

The article compares Spring's three dependency‑injection styles—field, setter, and constructor—showing code, execution order, source‑code mechanics, risks such as null‑pointer windows and reflection tampering, and concludes that constructor injection (preferably with Lombok @RequiredArgsConstructor) is the production‑grade choice.

Constructor InjectionDependency InjectionField Injection

0 likes · 10 min read

Which DI Injection Method Should You Use in Production? Field vs Setter vs Constructor

Java Tech Workshop

Jun 12, 2026 · Fundamentals

Visual Guide to Spring IOC: Understand Control Inversion Without Memorizing Jargon

This article explains the difference between traditional object creation and Spring's IoC container, clarifies how IOC and DI relate, compares three injection methods, debunks common misconceptions, and shows how to swap implementations seamlessly, all with concrete Java code examples.

Dependency InjectionJavaLoose Coupling

0 likes · 9 min read

Visual Guide to Spring IOC: Understand Control Inversion Without Memorizing Jargon