The J2EE APIs includes several technologies that extend the functionality of the base J2SE APIs. Some of these are:
The Enterprise Java Beans API defines a set of APIs that a distributed object container will support in order to provide persistence, remote communication (using RMI), concurrency control, and access control for distributed objects.
These packages define the JAXP API
These packages define the Java Message Service (JMS) API
One of the benefits of J2EE as a platform is that it is possible to get started with little, or no, expenditure. The J2EE implementation from Sun can be downloaded for free, and there are a great many open source tools available to extend the platform or to simplify development.
Examples of third party open source Java development tools include:
General APIs
javax.ejb.*
javax.servlet
The Servlets API defines a set of APIs between a web container and a servlet that is responsible for processing requests and issuing responses.javax.servlet.jsp
The javax.servlet.jsp and javax.servlet.jsp.tagext packages define the JavaServer Pages API.javax.naming
The javax.naming, javax.naming.directory, javax.naming.event, javax.naming.ldap and javax.naming.spi packages define the Java Naming and Directory Interface API.java.sql, javax.sql
The java.sql and javax.sql packages define the Java Database Connectivity (JDBC) APIjava.transaction.*
These packages define the Java Transaction API (JTA) javax.xml.*
javax.jms.*
Low cost development
External links