JVM on XGUGENG

What Is the Concurrent Mode Failure?

Wed, 31 Oct 2018 14:25:16 +0800

This is a question that I was asked during an interview: what does the concurrent mode failure means? It’s really a good question to check your understanding of Concurrent Mark Sweep (CMS) Collector.

This post starts with concurrent mode failure and explains the whole steps of one CMS cycle.

In a nutshell,

The message “concurrent mode failure” signifies that the concurrent collection of the Old Generation did not finish before the Old Generation became full.

JVM Series: class File Format

Thu, 17 May 2018 16:52:29 +0800

Today, let’s focus on the class file format, the hardware- and operating system-independent binary format used to represent compiled classes and interfaces.

A class file consists of a stream of 8-bit bytes. All 16-bit, 32-bit, and 64-bit quantities are constructed by reading in two, four, and eight consecutive 8-bit bytes, respectively.

JVM Series: Class Loader

Wed, 18 Apr 2018 18:27:20 +0800

The Java Classloader, a part of the Java Runtime Environment, dynamically loads Java classes into the Java Virtual Machine. Each Java class must be loaded by a class loader.

JVM Series: Oop and Klass

Tue, 10 Apr 2018 14:46:26 +0800

As a part of JVM Series, this post tries to explore the object model in JVM.

JVM Series: Overview

Tue, 09 Jan 2018 20:56:47 +0800

When executing a java program, you may simply input in terminal, like:

javac HelloWorld.java
java HelloWorld

Behind these commands, JVM, as the cornerstone of the Java platform, does a lot of work, which are what this blog attempts to figure out. Today, a new series about JVM will be started, and this is the first episode.

Mind Maps for Java and JVM

Fri, 16 Jun 2017 18:14:16 +0800

These two mind maps are drawn for the further exploration of Java and JVM. For Java I try to cover some advanced features ranging from NIO and Thread. As to JVM, few components are covered, of course, I will replenish it at any moment.