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Published on  Jan 01, 2024

Java SE to J2EE and Jakarka EE


Java and J2EE (Java 2 Platform, Enterprise Edition) and now called as Jakarta EE are related technologies, but they serve different purposes and are used in different contexts within the realm of Java development.

Java:

1. Core Java (Java SE):

  • Purpose: Core Java, also known as Java Standard Edition (SE), is the fundamental and foundational part of the Java platform. It includes the basic libraries and functionalities needed for general-purpose programming.
  • Use Cases: Core Java is used for developing standalone applications, command-line tools, desktop applications, and more. It provides the basic building blocks for Java development.

2. Key Features:

  • Object-oriented programming
  • Platform independence (Write Once, Run Anywhere - WORA)
  • Robust memory management (garbage collection)
  • Multi-threading support
  • Exception handling
  • Libraries for networking, I/O, and more

3. Example Applications:

  • Console applications
  • GUI applications (with JavaFX or Swing)
  • Command-line tools
  • Desktop applications

J2EE (Java 2 Platform, Enterprise Edition):

1. Purpose:

  • Enterprise-Level Applications: J2EE, known as Java EE (Java Platform, Enterprise Edition) and now as Jakarta EE, is an extension of Java SE specifically designed for developing enterprise-level, distributed, and scalable applications.
  • Use Cases: It is used for building large-scale applications, particularly web applications, that require features like transaction management, security, scalability, and robustness.

2. Key Features:

  • Enterprise Beans (EJB): Components for building business logic in enterprise applications.
  • Servlets and JSP (JavaServer Pages): For building web applications.
  • JMS (Java Message Service): For messaging between distributed components.
  • JTA (Java Transaction API): For managing transactions.
  • JCA (Java Connector Architecture): For integrating with enterprise information systems.
  • JavaMail: For email communication in Java applications.
  • Security APIs, XML APIs, and more.

3. Example Applications:

  • Large-scale web applications
  • Enterprise resource planning (ERP) systems
  • Customer relationship management (CRM) systems
  • E-commerce applications

Comparison:

  • Scope:

    • Java (SE): Primarily focused on general-purpose programming, standalone applications, and desktop applications.
    • J2EE (Java EE): Designed specifically for developing large-scale, distributed enterprise applications, especially web-based applications.
  • Libraries and Components:

    • Java (SE): Provides core libraries for basic programming needs.
    • J2EE (Java EE): Extends Java SE with additional libraries and components tailored for enterprise-level applications.
  • Application Type:

    • Java (SE): Suitable for a wide range of applications, including desktop and standalone applications.
    • J2EE (Java EE): Specifically designed for building enterprise-level applications, especially those with complex business logic and distributed architecture.

In summary, Java SE is the foundation for general-purpose Java development, while J2EE/Java EE extends Java SE with additional features and libraries specifically tailored for developing large-scale, distributed enterprise applications.

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