Introduction. Enterprise Java Instructor: Please introduce yourself Name Experience in Java Enterprise Edition Goals you hope to achieve
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1 Enterprise Java
2 Introduction Enterprise Java Instructor: Please introduce yourself Name Experience in Java Enterprise Edition Goals you hope to achieve
3 Course Description This course focuses on developing and testing server-side applications based on the Java 2 Enterprise Edition (J2EE) component model We will build and test J2EE applications
4 Audience Students, professionals, and developers who wish to know about the Java 2 Enterprise Edition
5 Prerequisites Java programming DB2 programming
6 Course Objectives 1 After completing this course, you should be able to: Design and develop Java Servlets Design and develop JSPs Build and test server-side logic which is threadsafe in a concurrent web application environment Manage end-user state
7 Course Objectives 2 After completing this course, you should be able to: Create basic session and entity EJBs Access container and server services from enterprise documents Implement Java clients calling EJBs
8 Agenda Each unit in this course is of two/four hours duration
9 Summary We've looked at the overall course objectives and the agenda Let us get started
10 Unit 1 Java 2 Enterprise Edition Overview
11 Learning Objectives At the end of this unit, you will be able to: Define J2EE Describe the J2EE architecture Define the J2EE services and communication mechanisms
12 Learning Objectives 1 Describe the types of J2EE containers Explain the types of J2EE packaging mechanisms Describe the various application scenarios Discuss the J2EE tools
13 Introduction Current business and enterprise information systems The Internet is pervading almost all enterprises and e-business is growing rapidly Information has become the most valuable assets of organizations Complexity of the application is increased but development time is reduced Applications need to work with legacy systems
14 Introduction 1 Characteristics of an enterprise application Reliability and Availability Security Scalability Different enterprise application models 2-Tier architecture 3-Tier architecture n-tier architecture
15 2-tier Architecture Application Client Database Server
16 3-tier Architecture Presentation logic Business logic Database Client Server Tier-0 Tier-1 Tier -2
17 n-tier Architecture Browser Client Application Client Firewall Client tier Presentation logic Business logic Infrastructure Services Middle tier Database Data tier
18 Drawbacks in Current Frameworks Portability Enterprise application developed for a platform is not portable across all platforms Infrastructure services Services like transactional, security etc., provided by one vendor will not be compatible with another EIS connectivity Interfaces provided to access EIS resources are also vendor specific
19 What is J2EE? Specifications provided by Sun Microsystems It comprises a collection of APIs to support enterprise application development It addresses all the drawbacks mentioned in the previous slide Definition J2EE is a simple unified standard for developing distributed enterprise applications through a component-based application model
20 J2EE Architecture Overview Client Client Client Client Tier Firewall Client Middle Tier Web Web container container Servlet Servlet Web tier JSP JSP EJB EJB container container EJB EJB EJB EJB EJB tier (RDBMS, ERP, Legacy Application) EIS Tier
21 J2EE Elements J2EE is defined based on the following elements: Specification Standards that J2EE server provider must implement EJB specification, JSP specification, Java Servlet specification Application programming model Standard model for developing multi-tier and web based applications
22 J2EE Elements Platform It defines standard platform for hosting J2EE applications Compatibility Test Suite (CTS) It is used to validate the conformance of a J2EE platform product Referential Implementation It demonstrates the capabilities of J2EE and provides operational definitions of J2EE
23 J2EE Approach It is component based Components developed will depend on system level entity known as containers provided by the J2EE server providers
24 J2EE Architecture Applet Container Applet Container J2SE Applet Applet HTTP, SSL Web Container Web Container JSP JSP Servlet Servlet Java Mail JMS JNDI JTA JAF RMI-IIOP JBDC J2SE HTTP, SSL RMI- IIOP EJB Container EJB Container Enterprise Enterprise Bean Bean JMS JNDI JTA Java Mail JAF RMI-IIOP JBDC J2SE Application Application Client Client Container Container Application client Application client JMS JNDI RMI-IIOP JDBC J 2 S E Database Database
25 Benefits of J2EE Simplified architecture and development Simple standard to all aspects of building and large scale development of applications It supports Write Once, Run Anywhere portability Since it is component-based model, maintenance is easy Scalability It provides highly scalable infrastructure Application work load can be transparently distributed across parallel systems
26 Benefits of J2EE 1 Choice of tools It allows the end customer to choose wide array of middleware, tools, hardware, OS and application designs Integration with existing EISs It provides number of industry APIs to interact with EIS resources JDBC API allows for accessing relational data It also provides mechanism for accessing ERP and CICS resources
27 Benefits of J2EE 2 Flexible security model It provides single sign-in access to application services
28 J2EE Platform Technologies J2EE platform technologies fall into three categories Component technologies Used to provide user interface and business logic for the enterprise applications Service technologies Allows application to access the services such as database access, transaction, JNDI, etc. Communication technologies Communication technologies provide mechanisms for communication between client and server and between collaborating objects hosted by different servers
29 Component Technologies Client-side components Used to provide user interface part of the application Server-side components Used to provide dynamic contents and business logic to the application
30 Client-side Components Application Clients It is a Standalone Java application program J2EE provider provides a container to run the client application To access J2EE services the Java application program should run inside the container Browser based clients Used to provide user interface for web clients Developed using HTML, DHTML, Applet, etc., Does not have J2EE container Access the resources through Web container only
31 Application Client Component App App Client Client Container Container Application Application Client Client HTTP/SSL JMS JNDI RMI-IIOP JDBC J2SE RMI-IIOP JSP JSP Servlets Servlets Web container EJB EJB EJB EJB EJB container Database Database
32 Browser-based Client Component Browser J2EE Server Servlet JSP Web Container JDBC RMI-IIOP Java Mail JAF JTA JMS Client Machine EJB EJB EJB Container JDBC RMI-IIOP Java Mail JAF JTA JMS Database
33 Server-side Components Web Components Software entities that provides response to request Used to provide dynamic pages to web clients Servlets Java programs Provide dynamic response to the request JSP Text-based document Contains information about how to a generate response for a request
34 Server-side Components 1 EJB Components Provide business logic to the enterprise application They are scalable, transactional and provide multiuser support Session Bean Provide service to the client Exists for a single client session Entity Bean It is a persistent object to represent data stored in datasource It is data-centric
35 Service Technologies Database access Used to handle data from relational databases Based on JDBC specification J2EE platform requires JDBC 2.0 core APIs and extension APIs JNDI Used to lookup remote objects Application can store and retrieve any type of named Java object
36 Service Technologies 1 Transaction Based on JTS and JTA It allows multiple components to participate in single transaction JTA specifies standard interfaces and JTS is the implementation of transaction services
37 Communication Technologies HTTP Used across the Internet to access object (images, pages etc.) J2EE platform requires implementation of the HTTP HTTP(S) HTTP over SSL Provides privacy over the Internet Ensures the messages are not tampered with
38 Communication Technologies 1 RMI Used to access objects running in other JVMs It uses serialization technology and the Java Remote Method Protocol (JRMP) to transform local method invocation into remote method invocation J2EE requires implementation of JRMP protocol OMG Allows objects hosted by the J2EE platform to access remote objects developed using the OMG s Common Object Request Broker Architecture (CORBA) technologies and viceversa
39 Communication Technologies 2 JMS Provides a way to asynchronously send and receive messages JMS supports point-to-point and publishsubscribe styles of messaging Java Mail Allows an application to send notifications to users
40 Communication Technologies 3 JAF Used to handle data held in message Integrates MIME data type into Java platform Connector Architecture Standard API for connecting J2EE platform to EIS resources
41 J2EE Container Architecture J2EE Server Component Contract Other Container Services App App components components Deployment Descriptor Deployment Descriptor Container App App Components Components Container Service APIs Declarative Services
42 Types of J2EE Containers Application Client Supports application client components Required to provide runtime support for standalone application Applet Container Includes support for applet-programming model J2SE compatible execution environment acts as a container
43 Types of J2EE Containers Web Container 1 Provides runtime environment for web components Provides security, concurrency transactions etc. EJB Container Provides runtime environment for EJB components EJB specification establishes the contract between the EJB components and the EJB containers
44 J2EE Packaging EJB Module Collection of reusable EJB components Packaged into EJB Java Archive (JAR) file It contains Session and Entity bean classes Web Module Collection of web components and resources Packaged into Web ARchive (WAR) file It contains Servlets and JSP
45 J2EE Packaging 1 Application Client Contains client side components Packaged into JAR file Application Packaged into Enterprise ARchive(EAR) file
46 J2EE Deployment Descriptors Deployment The process of installing and customizing an application in an operational environment Deployment Descriptor(DD) It is an XML file Each module is associated with a DD J2EE application is associated with a DD
47 J2EE Packaging and DD J2EE J2EE Application Application.EAR.EAR File File Application Application DD DD EJB Module. JAR File Web Module. WAR File Client Module. JAR File Enterprise Bean EJB DD Servlet JSP HTML.GIF WEB DD Client Class Client DD
48 J2EE Application Scenarios Multi-tier Stand-alone client Web-centric application Business-to-Business
49 Multi-tier Scenario Browser HTML, HTTP, XML Web Container Web Container EJB Container EJB Container EIS Resources JSP, Servlets, XML, JavaMail Enterprise Beans, JMS, JTA, JDBC (for connection)
50 Stand-alone Client Web Container Web Container EJB Container EJB Container EIS Resources Stand-alone Client Stand-alone Client
51 Web-centric Application Browser Browser EIS Resources HTML, HTTP, XML Web Container Web Container JSP, Servlets, XML, JavaMail JDBC
52 Business-to-Business Web Container Web Container EJB Container EJB Container HTTP(S), XML Web Container Web Container RMI-IIOP, JMS EJB Container EJB Container EIS Resources
53 J2EE Tools WSAD Tool for Enterprise application development and deployment Testing tool for deployment WAS Provides deployment tools for J2EE applications Used to deploy products for commercial use
54 Summary Now that you have completed this unit, you should be able to: Define J2EE Describe the J2EE architecture Define the J2EE services and communication mechanisms Describe the types of J2EE containers Explain the types of J2EE packaging mechanisms
55 Summary 1 Describe different application scenarios Discuss J2EE tools
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