This is a book on Oracle J2EE, covering standards, concepts and applications. J2EE is an industry standard for enterprise application development and deployment using Java technologies. All popular vendors like Oracle, BEA, IBM support J2EE. The Oracle Companion To J2EEEhas 3 parts. Part I focuses on understanding internet platform with client, application server and database tiers. Overview of J2EE is explained with Oracle 9i. Java primer covers basics and advanced concepts in Java. Client part of an application could be developed using many tools and the book covers Java Scripts as one of the ways. Database primer builds up the essentials of SQL, a vehicle for working with databases. Part II is the core of the book. It covers J2EE in detail covering database connectivity (JDBC, SQLJ, Java Stored procedures), web development (Servlets, JSP), J2EE Core Services, EJB, XML, Web Services, Security). Part III dealing with developing real life J2EE compliant applications demonstrate the learning’s in Part II with real life scenarios. The authors, sharing their experience, cover development life cycle and customer expectations of applications.