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History of Java, Architecture of Java, Server Provider Companies

#java #architecture

1) History of Java

Origin of Java (1991)

  • Java was created by James Gosling and his team at Sun Microsystems.

  • The project was initially called “Green Project.”

  • It was designed for embedded systems (like TVs, set-top boxes).

First Name: Oak

  • The language was first named “Oak” (after an oak tree outside Gosling’s office).

  • Later renamed to Java because “Oak” was already trademarked.

Official Release (1995)

  • Java was officially released in 1995.
  • Key concept introduced: “Write Once, Run Anywhere (WORA)”
  • It became popular due to internet growth and web applications.

Key Features That Made Java Popular

  • Platform independent (runs on JVM)
  • Object-Oriented Programming (OOP)
  • Secure and robust
  • Supports multithreading

Java Versions Timeline

  • Java 1.0 (1996) - First stable version, Focus on web browsers and applets

  • Java 2 (1998) - Introduced J2SE, J2EE, J2ME, Used for enterprise applications

  • Java 5 (2004) - Major update: Generics, Enhanced for loop, Autoboxing

  • Java 8 (2014) - Most popular version - Introduced: Lambda expressions, Stream API

  • Java 11 (2018) - Long-Term Support (LTS) version

  • Java 17 (2021) - Another LTS version with performance improvements

Oracle Acquisition (2010)

  • Oracle Corporation acquired Sun Microsystems.
  • Since then, Oracle maintains Java.

2) Architecture of Java

  • The architecture of Java explains how Java programs run on different systems using the Java Virtual Machine (JVM). It is the reason behind Java’s famous feature “Write Once, Run Anywhere.”

  • Java architecture mainly consists of: Java Source Code, Compiler (Javac), Bytecode, JVM (Java Virtual Machine), Operating System

Source Code (.java file)

  • Write a program in Java
  • Example: Hello.java

Compiler (Javac)

  • The Java compiler converts source code into bytecode
  • Bytecode file → .class

Bytecode

  • Platform-independent code
  • Can run on any system with JVM

JVM (Java Virtual Machine)

  • JVM is the core of Java architecture.
  • It converts bytecode into machine code and executes it.
  • Executes bytecode using: Interpreter, JIT (Just-In-Time) Compiler

Java Runtime Environment (JRE)

  • JRE = JVM + Libraries
  • Provides runtime environment to run Java programs

Java Development Kit (JDK)

  • JDK = JRE + Development tools
  • Includes: Compiler (javac), Debugger, Other tools

Simple Flow Diagram

Java Source Code (.java)
        ↓
   Java Compiler (javac)
        ↓
     Bytecode (.class)
        ↓
        JVM
        ↓
   Machine Code
        ↓
   Operating System
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3) Server Provider Companies

Top Server Providers for Java

Amazon Web Services (AWS)

  • Very popular for Java apps

  • Supports: Spring Boot, Java EE

  • Services: EC2 (servers),Elastic Beanstalk (easy deployment for Java)

  • Used in large-scale enterprise applications

Microsoft Azure

  • Supports Java, Spring Boot

  • Good integration with enterprise tools

  • Provides managed app services

Google Cloud Platform

  • Good for Java microservices

  • Supports Kubernetes + Docker

  • Strong performance

Oracle Cloud

  • Best for Java because: Oracle owns Java

  • Great for database + Java applications

Java Application Servers

Apache Tomcat

  • Most commonly used

  • Lightweight

  • Best for beginners

JBoss (WildFly)

  • Enterprise-level Java server

  • Supports full Java EE

GlassFish

  • Official Java EE reference server

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