Capturing thoughts and reflections while coding.
This article explains how C++ compilers implement virtual functions using a hidden vptr and virtual table, showing how class size grows from 1 to 8 bytes, detailing memory layouts for single, multiple, and diamond inheritance, and providing commands to dump vtable and layout information.
This guide explains how multipart/form-data enables sending JSON and binary data together, outlines its essential specifications, demonstrates front‑end FormData usage, and details Spring Boot back‑end handling with @RequestParam and @RequestPart annotations.
Learn how to create a Sonatype account, configure Maven POM metadata, add source and Javadoc jars, sign artifacts with GPG, set up Gradle publishing plugins, and deploy both SNAPSHOT and RELEASE versions to Sonatype’s OSS repository using Gradle 6.2.
This guide explores advanced MySQL techniques—including ON DUPLICATE KEY UPDATE for upserts, INSERT IGNORE to bypass errors, replacing subqueries with JOINs, handling LEFT JOIN pitfalls, efficient pagination strategies, multi‑table UPDATE/DELETE via JOIN, and the nuances of COUNT(*) versus COUNT(1).
This guide explains how to configure JVM options to capture GC logs, use GCViewer to interpret Parallel, G1, and CMS collector logs, decode each log field, and apply concrete tuning parameters to improve pause times and overall application throughput.
This article explains the seven Java garbage collectors available up to JDK 1.8, compares their strengths and weaknesses, and shows how to select and tune the appropriate collector—Serial, Parallel, CMS, or G1—based on application characteristics and deployment environments.
This article dissects Netty's custom FastThreadLocal and FastThreadLocalThread implementations, showing how they replace JDK ThreadLocal with constant‑time indexed access, padding to avoid false sharing, and customizable initialization and cleanup to boost backend concurrency performance.
The article explains a 14‑hour discrepancy between MySQL's created_time and recovery_time timestamps, analyzes JVM and driver timezone settings, traces MyBatis and MySQL driver conversions, and provides practical fixes by adjusting MySQL server and JDBC URL timezones.
After discovering misconfigurations in a Spring Boot project’s QuartzJobBean implementation, this article examines the root causes, compares legacy and modern Spring solutions—including custom JobFactory, AutowireCapableBeanFactory, and the spring-boot-starter-quartz starter—and provides detailed code examples to correctly integrate Quartz with Spring’s IoC container.
