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JVM Internals

The Java Virtual Machine (JVM) is a crucial component of the Java Runtime Environment (JRE) that provides a runtime environment for executing Java applications. Its architecture consists of three main components: the class loader, the runtime data area, and the execution engine.

The class loader is responsible for loading Java classes into the JVM. It searches for the necessary classes and loads them into the runtime data area. The runtime data area is where the JVM stores data during program execution, including the method area (for class and method information), the heap (for object storage), and the stack (for method calls and local variables). The execution engine interprets the bytecode and executes the program’s instructions. Additionally, the JVM includes a garbage collector that automatically manages memory by freeing up space that is no longer in use ¹²³.

Understanding these internals is essential for optimizing Java applications and debugging issues that may arise during execution.

JVM Architecture

Javarevisited

JVM (Java Virtual Machine) is a software that interprets and executes Java code. Here’s a simple way to understand its architecture:

Java Virtual Machine and its Architecture

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The JVM can be simply known as the engine that provides a runtime environment for Java and its applications. The JVM is considered to be a part of the JRE (Java Runtime Environment). Its commonly and ...

Know the Difference Between JVM, JRE, And JDK

Javarevisited

Hello everyone, in this article, I’ll be discussing and writing about the heart of Java Programming — JDK , JRE , and JVM . This is one of the frequently asked interview questions on Java programming....

A Deep Dive into JVM Start-up

Inside Java

When you start a Java application, there might be an inclination to believe that the only code being executed is the Java byte code passed to the JVM, i.e. the .class files that have been compiled by ...

A Deep Dive into JVM Start Up

Inside Java

Make sure to check the video description .

Java | Core

JavaToDev

The Java Virtual Machine (JVM) is an abstract computing machine that enables a computer to run a Java program. When we run a Java application, the JVM is responsible for converting the Java bytecode i...

Inside the JVM — Part 02 (ClassLoader)

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“Integrity is doing the right thing, even when no one is watching.” C. S. LewisNow let’s review the JVM, Basically, JVM has three main functions, which are to Loading the compiled class file, Store it...

A Concise Understanding of Java’s JVM, JRE and JDK

Level Up Coding

For anyone beginning their journey into Java development, you will at some point (very soon) run into the acronyms JVM, JRE and JDK. This article is written to give you a very clear and concise…

Memory Area and Execution Engine in JVM

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Hii guys! How are you doing? So in the previous blog, we have seen how class loader subsystem works and its function for loading the classes and verifying the byte code at Runtime. Today we will see…

How Java achieve Platform Independency

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Hola Readers! Welcome back after a lengthy break. Hope you missed my writing. 🤗I was writing a lengthy article regarding JVM today (expect to publish it really soon). But before talking about the JVM...

Java Virtual Machine (JVM) Internals, Part 2 — Class file format

Javarevisited

In this series of articles I’ll be discussing about how Java Virtual Machine works. In part 1 we looked at ClassLoader sub-system of Java Virtual Machine. In this article we are going to talk about Cl...

JVM 101: Garbage Collection and Heap (Part 2)

Javarevisited

Hola Readers! Welcome back.Today we are going to talk about another interesting aspect of JVM (Java Virtual Machine). This is the second post of this series, so if you still didn’t check out the part ...