J2EE is an environment for developing and deploying enterprise applications. The J2EE platform consists of a set of services, application programming interfaces (APIs), and protocols that provide the functionality for developing multitiered, web-based applications.
J2EE, which stands for Java 2 Platform, Enterprise Edition, is a set of specifications, APIs (Application Programming Interfaces), and technologies developed by Sun Microsystems (now owned by Oracle) for building enterprise-level, distributed, and scalable Java applications. J2EE provides a standardized, component-based model for designing, developing, deploying, and managing multi-tier, server-centric applications.
Key features and components of J2EE include Enterprise JavaBeans (EJB), Java Servlets, JavaServer Pages (JSP), Java Message Service (JMS), Java Naming and Directory Interface (JNDI), and more. It aims to simplify the development of large-scale, distributed applications by providing a robust and scalable infrastructure.
As of my knowledge cutoff in January 2022, the term “J2EE” has been somewhat deprecated in favor of the term “Java EE” (Enterprise Edition) due to changes in the Java EE platform. Java EE is now part of the Eclipse Foundation under the name “Jakarta EE,” following the transfer of Oracle’s Java EE technologies to the Eclipse Foundation.
So, while J2EE historically refers to the earlier versions of the enterprise Java platform, it’s essential to note that the more modern and widely used term is Java EE or Jakarta EE, depending on the specific version and the organization managing it.