This document maps J2EE technologies across various system blocks, including traditional web clients, rich internet applications (RIA), web application frameworks, programmatic access and APIs, business logic, workflow, data access, infrastructure services, and cross-cutting concerns like security and monitoring. It provides examples of specific technologies that can be used for each block, such as jQuery, Struts, EJB, Hibernate, Solr, Tomcat, ActiveMQ, MySQL, Hadoop, and OpenAM. The document aims to help understand the landscape of technical components involved in J2EE architecture.