J2EE

J2EE, now known as Java Platform, Enterprise Edition or Java EE, is a set of specifications from Sun Microsystems for creating and running enterprise applications. It is a platform-independent, Java-centric environment designed for developing and deploying large-scale, multi-tiered, and highly available business applications. J2EE provides a robust framework that simplifies the development of complex applications by offering a collection of services and APIs.

Key components of the J2EE platform include the Java Servlet API, JavaServer Pages (JSP), Enterprise JavaBeans (EJB), Java Naming and Directory Interface (JNDI), Java Message Service (JMS), and Java Transaction API (JTA). These specifications define how different parts of an application interact and how they are managed by a J2EE container, such as an application server. The container provides services like transaction management, security, and concurrency, allowing developers to focus on business logic rather than low-level infrastructure.

J2EE applications are typically structured in a multi-tiered model, often involving a presentation tier, a business tier, and a data tier. This architecture promotes modularity, scalability, and maintainability. The platform has been widely adopted in enterprise environments for its ability to handle complex business requirements, integrate with existing systems, and ensure high levels of performance and reliability. Oracle acquired Sun Microsystems and continues to evolve the Java EE platform.