J2EE

2.  A set of Java-related software practices and
technologies for building enterprise-class
applications
 Emphasis on availability, security, reliability and
scalability
 Multi-tiered application model

3.  Enterprises spread across multiple geographic
and organization boundaries
 Pendulum has swung from data center to desktop
to somewhere in-between

4.  Enterprise JavaBeans
 Java Servlets
 Java Server Pages
 HTTP / HTTPS
 Java RMI-IIOP
 JavaIDL
 JDBC
 Java Naming and
Directory Interface
 JavaMail and Java
Activation Framework
 Java Messaging
Service
 Java Transaction API

5.  Partition app construction task by role
 Shift much of development burden to bean
containers by taking advantage of container
services
 Select desired services declaratively
 Support non-persistent (session) and persistent
(entity) usage

6.  Bean provider
 Container provider
 Server provider
 Application assembler
 Application deployer
 System administrator

7.  Implicit: distributed transaction management,
security, resource management and component
lifecycle, persistence, remote accessibility,
multiclient support, component location
transparency
 Explicit: naming and directory services

8.  Java RMI uses Java Remote Method Protocol
(JRMP) as its default comm layer
 Internet Inter-ORB Protocol (IIOP) is the standard
protocol used by CORBA
 Provides greater reusability, cross-language use,
better integration into legacy systems, firewall
navigation and context propagation

9.  Addresses semantic differences between RMI and
CORBA relating to distributed garbage collection,
object conversion and type mapping

10.  Provides access to most database management
systems via SQL
 Similar, though not identical to Microsoft ODBC

11.  Provides a unified API for associating names with
objects, accessing objects by their names and
associating attributes with objects
 Acts as an adapter to LDAP, Novell NDS, Sun
NFS, Java RMI and both Unix-style and DOS-
style file systems

12.  Provides a high-level API for accessing an e-mail
system
 Uses service providers for SMTP, IMAP, POP3
and other protocols
 JAF provides means to describe and display
content of varying types

13.  Provides an API for message-based interprocess
communications
 Supports point-to-point and publish/subscribe
models
 J2EE provides interfaces; third-party vendors
supply implementations (IBM MQSeries, Progress
SonicMQ, FioranoMQ)

14.  Low-level API for defining units of work and
maintaining the logical integrity thereof
 Not explicitly used by EJB programmers

15.  Reference implementation from Sun
 BEA Systems WebLogic
 IBM WebSphere
 Oracle 8i
 enhydra.org
 openejb.org

16.  Updates to EJB, Servlet and JSP specs
 Addition of JAXP, JAAS
 Addition of message-driven bean type
 Addition of J2EE Connector Architecture
 Improvements to container-managed persistence

17.  Common Object Request Broker Architecture
(CORBA)
 Microsoft COM/DCOM, COM+, .NET

18.  “Designing Enterprise Applications with the Java 2
Platform, Enterprise Edition”,
http://java.sun.com/j2ee/blueprints/
 “Mastering EJB” by Roman (Wiley)
 “Developing Java Enterprise Applications” by
Asbury and Weiner (Wiley)
 “Java Network Programming” by Harold (O’Reilly)