Understanding Java ClassLoader.loadClass() API and Its Performance Impact

This article explains how the java.lang.ClassLoader#loadClass() API works, why frequent concurrent calls can cause thread blocking due to internal synchronization, demonstrates the issue with a sample multithreaded program, analyzes thread‑dump data, and provides practical solutions to mitigate the performance problem.

JVMJavaThreadBlocking

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Understanding Java ClassLoader.loadClass() API and Its Performance Impact

Cognitive Technology Team

Oct 28, 2024 · Backend Development

Investigation of Sporadic Netty Message Send Delays Exceeding One Second

During performance testing of a Netty-based service, occasional message sends exceeded one second despite low CPU usage, prompting an investigation that identified a blocking ChannelHandler caused by a conditional sleep, leading to NioEventLoop thread stalls and delayed transmissions.

ChannelHandlerJavaNetty

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Investigation of Sporadic Netty Message Send Delays Exceeding One Second

DataFunSummit

Aug 21, 2022 · Operations

Log4j2 Thread Blocking Causes and Mitigation Strategies

This article examines how excessive logging, AsyncAppender queue saturation, JVM reflection optimizations, and Lambda class loading can cause thread blocking in Log4j2, analyzes root causes with code examples, and provides practical guidelines and best‑practice configurations to prevent performance degradation in high‑throughput Java services.

AsyncAppenderJavaLoggingThreadBlocking

0 likes · 53 min read

Log4j2 Thread Blocking Causes and Mitigation Strategies