The document is a set of lecture notes on Enterprise Java from January to June 2014 prepared by Mr. Hitesh Kumar Sharma and Mr. Ravi Tomar. It covers core J2EE technologies, enterprise application architectures like 2-tier, 3-tier and n-tier, advantages and disadvantages of architectures, J2EE application servers, web containers and EJB containers. The notes are to be submitted by B.Tech CS VI semester students specializing in MFT, O&G, OSS and CCVT.