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Shepherd Advanced Notes

Dedicated to sharing advanced Java technical insights, daily work snippets, and the power of persistent effort.

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Latest from Shepherd Advanced Notes

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Shepherd Advanced Notes

Aug 21, 2023 · Backend Development

High‑Availability Rate‑Limiting Solutions for Spring Boot Systems

The article explains why rate limiting is essential for high‑traffic Spring Boot services, compares counter, sliding‑window, token‑bucket and leaky‑bucket algorithms, demonstrates implementations with plain Java, Guava RateLimiter, AOP, and distributed approaches using Redis‑Lua and Nginx‑Lua, and provides practical configuration examples.

GuavaNginxRate Limiting

0 likes · 20 min read

High‑Availability Rate‑Limiting Solutions for Spring Boot Systems

Shepherd Advanced Notes

Aug 14, 2023 · Backend Development

Common @Transactional Pitfalls in Spring Boot Business Code and How to Avoid Them

This article analyzes frequent scenarios where Spring's @Transactional annotation fails in Spring Boot projects—such as self-invocation, swallowed exceptions, misconfigured rollback rules, non‑public methods, wrong propagation settings, and long‑running transactions—and provides concrete fixes to prevent data inconsistency and performance issues.

@TransactionalCGLIB proxySpring Boot

0 likes · 17 min read

Common @Transactional Pitfalls in Spring Boot Business Code and How to Avoid Them

Shepherd Advanced Notes

Aug 7, 2023 · Backend Development

Implementing Multilevel Cache in Spring Boot with Redis and Caffeine

This article explains how to build a three‑layer cache architecture for Spring Boot by integrating Redis as a distributed cache with Caffeine as a local cache, covering configuration, custom CacheManager implementation, message‑driven synchronization, and practical usage examples.

CaffeineSpring Cachecache

0 likes · 15 min read

Implementing Multilevel Cache in Spring Boot with Redis and Caffeine

Shepherd Advanced Notes

Jul 31, 2023 · Backend Development

How Spring Uses AOP to Implement Transaction Management

This article explains why transaction control is essential for database‑backed applications, compares native JDBC/MyBatis handling with Spring's unified approach, details the core transaction APIs, and walks through the AOP‑based mechanism—including @EnableTransactionManagement, proxy generation, and CGLIB interception—that automatically opens, commits, and rolls back transactions at runtime.

@TransactionalAOPBackend Development

0 likes · 20 min read

How Spring Uses AOP to Implement Transaction Management

Shepherd Advanced Notes

Jul 24, 2023 · Backend Development

Understanding the Core Principles of Spring AOP Aspect Programming

This article explains how Spring AOP integrates AspectJ using CGLIB or JDK dynamic proxies, walks through a complete logging aspect example, and details the internal registration, proxy creation, and invocation processes that enable cross‑cutting concerns without modifying business code.

AOPAspectJCGLIB

0 likes · 15 min read

Understanding the Core Principles of Spring AOP Aspect Programming

Shepherd Advanced Notes

Jul 17, 2023 · Fundamentals

How to Pass Values Between Parent and Child Threads with InheritableThreadLocal and TransmittableThreadLocal

The article explains why regular ThreadLocal cannot share data from a parent thread to its child, introduces InheritableThreadLocal as a built‑in solution, shows its limitation with thread‑pool reuse, and demonstrates how Alibaba's TransmittableThreadLocal overcomes this issue with concrete code examples and output.

ConcurrencyInheritableThreadLocalJava

0 likes · 10 min read

How to Pass Values Between Parent and Child Threads with InheritableThreadLocal and TransmittableThreadLocal

Shepherd Advanced Notes

Jul 10, 2023 · Fundamentals

Understanding ThreadLocal: Usage, Implementation, and Memory Leak Risks

The article explains Java's ThreadLocal mechanism, detailing how each thread maintains its own ThreadLocalMap, provides practical code examples, examines the underlying source implementation—including set and get methods—and discusses potential memory‑leak pitfalls and ways to avoid them.

ConcurrencyJavaMemory Leak

0 likes · 11 min read

Understanding ThreadLocal: Usage, Implementation, and Memory Leak Risks

Shepherd Advanced Notes

Jul 4, 2023 · Backend Development

Implement Distributed Log Tracing in Spring Boot with MDC and traceId

This guide explains how to add a unique traceId to each request in a Spring Boot application, configure Logback/MDC to record it, propagate the ID across microservice calls and asynchronous threads using OpenFeign, RestTemplate, and TransmittableThreadLocal, enabling complete distributed log tracing.

LogbackMDCOpenFeign

0 likes · 18 min read

Implement Distributed Log Tracing in Spring Boot with MDC and traceId

Shepherd Advanced Notes

Jun 27, 2023 · Backend Development

Implementing Distributed Locks in Spring Boot with Redisson

This article explains how Redisson extends Redis to provide a rich set of distributed Java objects and services, walks through integrating Redisson into a Spring Boot project, demonstrates various lock types (reentrant, read‑write, semaphore, latch) with code examples, and details the internal watchdog mechanism that guarantees atomic lock acquisition and automatic renewal.

Distributed LockJavaRedis

0 likes · 19 min read

Implementing Distributed Locks in Spring Boot with Redisson

Shepherd Advanced Notes

Jun 19, 2023 · Backend Development

Elegant Unified Response and Global Exception Handling in Spring Boot

The article explains how Spring Boot projects can adopt a standard JSON response structure using a generic ResponseVO class and achieve automatic wrapping and global exception handling through a custom @ResponseResultBody annotation combined with ResponseBodyAdvice and @ControllerAdvice, reducing repetitive code and improving robustness.

Global Exception HandlingResponseBodyAdviceResponseVO

0 likes · 14 min read

Elegant Unified Response and Global Exception Handling in Spring Boot