J2EE /.NET Liz Farricker Whitney Mayoras Patrick Bailey

Overview  J2EE Background What is J2EE? Platform .NET Background Background Framework  Comparison  Future Outlook

J2EE: Background  Developed by Sun Microsystems in 1994 Created JAVA language which was open source Made JAVA application models, including development tools, to increase appeal for their software  IBM bundled all open source JAVA applications Sold as JAVA 2 Enterprise Edition  Strategic mistake for Sun IBM gets most profits for Sun’s work

What is J2EE?  A programming platform  Used primarily for development and running distributed multi-tier applications

J2EE Platform  Set of standards for a single JAVA 2 platform that hosts J2EE applications  Application components contribute to J2EE applications Application clients, applets, web components, Enterprise JavaBeans (EJBs)  Uses containers to provide runtime support to application components  Resource adapters provide a link between a container and an underlying EIS  Accessible database  Variety of standard services that application components use to communicate HTTP, HTTPS, Java Message Service, Security Services, Web Services, Management, etc.

J2EE Architecture

.NET: Background  Microsoft reacted to J2EE with an internet ready Windows platform Modified open source JAVA to become J# Modified their C++ to become C# Used their existing Visual Basic  Bundled all languages and programs together into a strong competitor for J2EE  Microsoft’s new strategy for keeping Windows the dominant OS in the market

.NET Framework  Programming environment for building, deploying, and running web services and applications  Contains common class libraries ADO.NET  ADO (Active Data Objects): data access components that use XML and SOAP for data interchange ASP.NET  ASP (Active Server Page): create Web Forms and Web Controls that the CLR can render into HTML; also where you build Web Services  Language neutral Supports C++, C#, Visual Basic, JScript (The Microsoft version of JavaScript), J#, and COBOL Third-party languages - Eiffel, Perl, Python, Smalltalk, and others

Common Language Infrastructure  Enables code written in multiple languages to be deployed in machine-readable code as if written in one

.NET Architecture

Similarities  Bring Object Oriented (OO) approach to enterprise computing  Virtual machine architecture for real time code interpretation Java Virtual Machine, Control Language Runtime  Implement a multi-tiered approach

Stack Function.NETJ2EE Relational Database AccessADO.NETJDBC Web ClientASP.NETJava Server Pages (JSP) and Servlets Standalone ClientWindows FormsAWT/Swing Distributed Components.NET RemotingRMI/IDL XMLSystem.Xml and.NET in general is built around XML. JAX Pack (JAXM, JAXR, JAXB, JAXP) MessagingMicrosoft Message Queuing (MSMQ)Java Messaging Service (JMS) Web Services SupportBuilt directly into.NET and Visual StudioJava Web Services Developer Pack (JWSDP) as well as vendor specific tools. Enterprise Components/TransactionsCOM+Enterprise Java Beans (EJB) IntegrationHost Integration Server, BizTalk ServerJ2EE Connector Architecture Component RegistrationActive DirectoryJava Naming and Directory Interface JNDI Application Similarities

Differences  Neutral Vendor/Portability  Framework Support and Productivity Tools.NET has eCommerce framework.NET has large number of system libraries J2EE cannot compare

Differences  Programming Language  Software licensing cost J2EE is more expensive to organize than.NET

How to Choose?  Importance of multi-vendor support?  How many platforms do you want to support?  How many programming languages do you want to use?  Willing to replace/retrain your staff?  What assets does your company already possess?  Return on Investment?

Market Shares  In 2003, 75% of application development projects were based on.NET and J2EE  Neither dominate the market  Both platforms currently hold roughly equal market shares

Future Outlook .NET Microsoft released a non-commercial version of the CLR that runs on other OS Ximian is working on a version for Linux  J2EE Moving towards the exploding market of mobile phones and handheld computers

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