Introduction to Enterprise JavaBean - Kasetsart University · 11.12.2004 · Introduction to Java 2 Enterprise Edition Adhiwat Kosakarika [email protected] – Sun Certified Java Programmer

Copyright by BrainStream Co., Ltd

Introduction to Java 2 Enterprise EditionIntroduction to Java 2 Enterprise Edition

Adhiwat [email protected]

– Sun Certified Java Programmer

– IBM Certify Enterprise Connectivity with J2EE

– IBM Certify Enterprise Application Development with IBM WebSphere Studio, V5.0

Copyright by BrainStream Co., Ltd /Page2

AgendaAgenda

Enterprise Java Course.

Server-Side Component Architecture.

J2EE Services.


Enterprise Java CourseEnterprise Java Course

Pichaya Juangpanich (Note)•Session Bean•Messaging

Instructor:Adhitwat Kosakarika(Win)•Entity Bean•Transaction Service



Schedule Week1:

20/10/2004 Win 3 Introduction to J2EE.

Java Distributed Objects.

22/10/2004 Win 3 Introduction to EJB.

Tool Development.



Schedule Week2:

1/11/2004 Win 3 EJB Architecture Concepts.

2/11/2004 Note 3 Session Bean

3/11/2004 Win 3 Entity Beans

Develop CMP

5/11/2004 Win 3 12 Step to Makes CMP

6/11/2004 Note 6 Session Bean Workshop



Schedule Week3:

8/11/2004 Win 3 12 Step to Makes BMP

9/11/2004 Note

10/11/2004 Win 3 Reference to EJB

CMR

12/11/2004 Win 3 EJB QL

Entity Conclusion

Note

3 EJB Client

13/11/2004 6 JMS


Enterprise Java CourseEnterprise Java CourseSchedule Week4:

15/11/2004 Win 3 Transaction

Exception

16/11/2004 Note

17/11/2004 Win 3 Security

Deployment

19/11/2004 Win 3 Workshop

Conclusions

20/11/2004 Note 6 MDB Workshop

3 Message Driven Bean



Outline:

BP4WS&EAI

Web Services

Enterprise Java Beans(SCEA)

CORBA&RMI Messaging&JNDI Middleware Concept

Design Consideration


ToolsTools

WebSphere Studio 5.– Editor.

– Test Environment.

WebSphere Server Advance Edition.

Oracle or DB2UDB.

SwiftMQ or MQSeries.


BackgroundBackground

One-tier, mainframe-type systems.

Two-tiers client/server based systems, separate application tier from resource tier.

Flexible Three-tiers and Multi-tiersapplication models.


BackgroundBackground

Flat Client vs. Thin Client.


Multi TiersMulti Tiers

Separated Business Logic from system services and User Interface.

Place Business logic in a Middle Tier.


Multi TiersMulti Tiers

Various Solutions to implement Multi Tiers.


Middleware ServicesMiddleware ServicesTransaction Monitors.

Message-Oriented Middleware.

Object Request Brokers.

Web Application Servers.


Java 2 Platform, Enterprise EditionJava 2 Platform, Enterprise Edition

Java 2 Platform, Enterprise Edition (J2EE) is a robust suite of middleware application services for server-side application development.


Java 2 Platform, Enterprise EditionJava 2 Platform, Enterprise Edition

J2EE is an extension of Java 2 Platform, Standard Edition (J2SE).


J2EE ServicesJ2EE Services

Summary:


ServletsServlets and and JavaServerJavaServer Pages (JSP)Pages (JSP)

Separating data elements (Model: EJB) from data presentation (View: JSP) and from manipulation of data into presentation (Controller: Servlet).


ServletsServlets and and JavaServerJavaServer Pages (JSP)Pages (JSP)

MVC Application.


Java Database Connectivity (JDBC)Java Database Connectivity (JDBC)

JDBC 2.0 has built-in support for database connection pooling.


Java Database Connectivity (JDBC)Java Database Connectivity (JDBC)

Type1: JDBC-ODBC

Type2: Native Client

Type3: Network Protocol

Type4: Native Protocol


Transaction Services (JTA/JTS) Transaction Services (JTA/JTS)

Java Transaction API (JTA)

Java Transaction Service (JTS)


J2EE Connector Architecture (JCA)J2EE Connector Architecture (JCA)

Providing a standard Resource Adapter to plug into Application Server.


J2EE Connector Architecture (JCA)J2EE Connector Architecture (JCA)Application Server provides:– Connection Management.

– Transaction Management.

– Security Management.


JDBC & JCAJDBC & JCA

JDBC base on JCA.


Java Naming and Directory InterfaceJava Naming and Directory Interface

Java Naming and Directory Interface (JNDI) is a standard for naming and directory services.

•Object CosNaming

•File System

•LDAP

•Novell File System


Java Messaging Service Java Messaging Service

Java Messaging Service (JMS) supported Messaging Systems, included Point to Point/Publish Subscribe.


Java Messaging ServiceJava Messaging Service

Messaging Application:


Java MailJava Mail

Java Mail API provides a platform-and protocol-independent framework to build Java-based mail and messaging applications.

Defined Mail Session in Middleware.


Distributed ObjectsDistributed Objects

Objects could be used across networks.


Distributed ObjectsDistributed Objects

Well-known Technology are:– Object Management Group (OMG) Component

Object Request Broker Architecture (CORBA) – Sun Java Remote Method Invocation (RMI)

Protocol– Microsoft Distributed Component Object Model

(DCOM).

In Java world, only CORBA and RMI they relate EJB.


CORBA OverviewCORBA Overview

Developed by a consortium of companies, Object Management Group.Provide a common, language- and vendor-neutral standard for Object DistributionStandard Interface enables interoperability between different vendors.Built around a special layer, Object Request Broker (ORB), that communication between clients and objects.


CORBA OverviewCORBA OverviewCommunicated between ORB by Internet-Inter ORB Protocol (IIOP).

Stub: marshalling of parameters of remote object.

Skeleton: unmarshalling of parameters of remote object.


CORBA OverviewCORBA Overview

CORBA clients/servers can base on variouslanguages(Java, C++, C, Smalltalk and Ada), Operating System, Networks.Two key building blocks in CORBA model:Interface Definition Language (IDL)– Normalizes differences caused by language or

operating system dependencies.

CORBA services– Provide standard to interact, such as naming

and transaction.


VisiBrokerVisiBroker JAVA CORBA DevelopmentJAVA CORBA Development

Create IDL.

Idl2java.

Create Client.

Create Object.

Compile.

Start Server.

Run Client.


VisiBrokerVisiBroker JAVA/C++ CORBAJAVA/C++ CORBA


Java Interface Definition LanguageJava Interface Definition Language

Is an implementation of CORBA specification.

Enables interoperability and connectivity with heterogeneous objects.

ORB provided with JDK 1.2.

Invoke remote network services using industry standards IDL and IIOP from OMG.


Remote Method InvocationRemote Method Invocation

Remote Method Invocation (RMI) enables to create Java distributed Application, simpler CORBA solution.

Located Remote Object by using Registry.



RMI uses object serialization to marshal and demarshal parameters

Allows RMI programs to pass by value objectsthat server can operate on a local copy.

Another advanced feature of RMI is distributed garbage collection, a feature that is not available in CORBA today.



RMI Protocol called JRMP.

Work with only Java Language.

Lack of multiple-language support.

Lack of CORBA services such as naming service, transaction, persistence service and security.


RMI over IIOPRMI over IIOP

Neither CORBA nor Java RMI were sufficient enough to building enterprise applications.

RMI over IIOP (RMI-IIOP) combines the best features of RMI with those of CORBA.

Synthesis of RMI-IIOP results in a unique combination of power and ease of use, the Enterprise JavaBeans.


From CORBA to EJBFrom CORBA to EJBCORBA has some drawbacks:– CORBA has a steep learning curve. Many cases

low-level APIs are too complex.– Different CORBA infrastructures were less

portable. – CORBA had no complete server-side component

model and distributed object framework. – CORBA vendors (or developers) had to integrate

CORBA services with a own, non-standard application layer.


From CORBA to EJBFrom CORBA to EJB

In 1998, SUN Micro system introduction EJB.

In 1999, OMG group has published CORBA Component Model (CCM).

The Most Application server market focus on EJB component solutions.

EJB was designed to be 100% CORBA-compliant.


From CORBA to EJBFrom CORBA to EJBEJB technology easier to build applications on top of a CORBA infrastructure.

With EJB,low-level APIs has been shifted from the application developer to the application server infrastructure (EJB container).

Business LogicApplication Server


Enterprise JavaBeansEnterprise JavaBeans

Enterprise JavaBeans (EJB) is an architecture for server-side component based distributed applications written in Java.

Provides separation of business logic with persistency, transactions, and other services


EJB specificationEJB specification

“The EJB architecture is a component architecture for development and deployment of component-based distributedbusiness applications”– Defines how server-side components are

written.

– Provides a standard architectural contract between components and container/servers.

– Interoperability EJB servers or CORBA.



EJB container is where EJB reside and make EJB available to client.

EJB are deployed into EJB containers and run on Server that provides services.



Located EJB through JNDI.EJB can accessible methods of remote object by RMI. EJB use RMI-IIOP, standard mapping of EJB interfaces to CORBA IDL. EJB offered through JTA/JTS for Distributed Transaction. EJB provide Messaging with JMS.


J2EE ContainerJ2EE Container


ConclusionsConclusions

Server-Side Component Architecture.

J2EE Services.

What’s EJB?

Documents

Introduction to Enterprise JavaBean - Kasetsart University · 11.12.2004 · Introduction to Java 2 Enterprise Edition Adhiwat Kosakarika [email protected] – Sun Certified Java Programmer