Скачать или смотреть How to Create JAR Files in Java Using IntelliJ | JAR vs WAR vs EAR Made Easy

You’ll learn how to create JAR files step-by-step and understand the differences between JAR, WAR, and EAR in Java development.

What You’ll Learn:
What are JAR, WAR, and EAR files?
When and why to use each type of archive
How do I create a JAR file using IntelliJ?
How to run a jar file

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EJB (Enterprise JavaBeans) is not a packaging format like JAR or WAR but a Java EE/Jakarta EE component model for building distributed business logic. However, EJBs are typically packaged inside JAR, WAR, or EAR files for deployment.

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Web Server versus Application Server

Web Server

Purpose: Handles only HTTP requests and serves static content.

Does Not Handle: Full business logic, EJBs, or advanced services.

Examples: Tomcat, Jetty are examples of web servers.

Application Server

Purpose: Enterprise-grade apps provide a full Java EE stack to handle dynamic requests, business logic, and enterprise services.

Supports Servlets, JSP, EJB, JPA, JMS, JTA, Web Services, and more.

Examples: WildFly / JBoss, GlassFish, WebLogic.
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