Introducing full-stack Internet architecture technologies centered on Java
This article explains the Proxy design pattern, illustrates its core participants with clear Chinese idiom analogies, and provides a complete static‑proxy implementation in Java—including interface, real subject, proxy class, and client code—while also noting the distinction between static and dynamic proxies.
This article explains the concept of database transactions, the ACID properties, how MySQL implements transactions with InnoDB, how to manage autocommit, the essential transaction control statements, a practical example using savepoints, and the four isolation levels supported by MySQL.
This article explains the key differences between Java's Lock interface and the synchronized keyword, covering their nature, lock acquisition and release mechanisms, fairness, ability to query lock status, usage scenarios, and includes example code demonstrating each approach.
This article explains the concepts and advantages of NoSQL databases, categorizes the four main types, introduces MongoDB’s data model and components, and provides step‑by‑step instructions for installing MongoDB 7.0 on CentOS 7 using both yum repository and manual RPM packages.
This article explains what Java OutOfMemoryError (OOM) is, outlines the most common OOM types such as Java heap space, GC overhead limit, Metaspace, and native thread exhaustion, provides sample code for each, and suggests basic mitigation strategies like adjusting JVM options or optimizing code.
This guide explains the concepts of ZooKeeper cluster roles and provides step‑by‑step instructions, including configuration file edits and command‑line operations, to set up a pseudo‑cluster on a single machine for testing and learning purposes.
This article explains Java annotations, their purposes such as providing compiler metadata, generating code, runtime processing, and documentation, introduces built‑in and meta‑annotations, and demonstrates how to create and use custom annotations both via reflection and with Spring AOP for logging, including full code examples.
This article explains what ZooKeeper is, describes its data model and four znode types, introduces the watch mechanism, and provides step‑by‑step commands for installing ZooKeeper, creating nodes, and verifying the service on a Java‑enabled machine.
This article explains the Observer behavioral design pattern, describes its participants, illustrates a real‑world e‑commerce scenario, and provides complete Java code for the observer interface, subject interface, concrete subject, concrete observers, and a test client, concluding with the pattern’s benefits.
This tutorial walks you through creating a Spring Cloud Alibaba project from scratch using IntelliJ IDEA and Maven, covering parent project setup, module creation, pom.xml configuration, a simple Spring Boot application, a Hello World controller, and how to run and verify the service.
