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This chapter described Java's evolution from an initial method of delivering customer/server classification applications by the employ of the web, to a sturdy OO platform that may pilot colossal-scale multiuser commercial enterprise applications.This chapter is from the booklet
over the years, the Java know-how platform has grown out of its regular applet customer/server origins into a sturdy server-aspect construction platform. initial platform applications added developed-in threading assist and supplied abstractions to I/O and networking protocols; newer types of the Java application progress kit (SDK) persisted to enhance these abstractions and interject more moderen framework choices.
The momentum of producing technology frameworks supporting commercial enterprise server-primarily based building has persisted, and has been formalized into the J2EE platform offering. the motivation of this providing is to give builders with a group of technologies that befriend the start of sturdy business-scale application systems. IT gurus are presented with an ever- altering enterprise and expertise landscape. know-how experts must equilibrium the demands for brand fresh automation requirements against the being of latest line of traffic applications; easily the employ of the know-how du jour perpetuates the issue of integrating present legacy methods. The purpose of the J2EE platform is to present a consistent and legit means by which these demands can breathe met with applications that possess the following traits:
excessive Availability— befriend and exist in a 24/7 international company atmosphere.
at ease— breathe sure user privateness and self assurance in traffic duty and transactions.
respectable and Scalable— aid high volumes of enterprise transactions accurately and in a well timed method.
This chapter presents an overview of the J2EE architecture, a short dialogue of the specification's Part design and the options they deliver, and describes which J2EE technologies this book will heart of attention on.
First, some background.
All J2EE technologies are constructed upon the Java 2 ordinary edition (J2SE). It includes simple platform courses, such because the Collections framework, together with more selected programs comparable to JDBC and different applied sciences that aid customer/server-oriented applications that clients acquire interaction with via a GUI interface (e.g., drag-and-drop and assistive technologies). solemnize that platform technologies aren't restrained to framework implementations. They additionally consist of construction and runtime befriend tools such because the Java Platform Debugger architecture (JPDA).
applied sciences specific to developing amazing, scalable, multitiered server-primarily based enterprise purposes are offered in the J2EE platform providing. while silent assisting customer/server- primarily based architectures, J2EE platform technologies deliver back for disbursed computing, message-oriented middleware, and dynamic internet web page development. This chapter and most of this e-book will deal especially with some of those technologies. In certain, WebSphere 5.0 (the focus of this e-book) implements the J2EE 1.3 platform specification. a list of the technologies from J2EE 1.three (together with the supported ranges) is proven in table 3.1.desk 3.1. J2EE technologies.
degree required through J2EE 1.three
Java IDL (Interface Definition Language) API
(supplied by way of J2SE 1.three)
JDBC Core API
2.0 (offered through J2SE 1.3)
(supplied by means of J2SE 1.3)
(offered with the aid of J2SE 1.three)
EJB (enterprise Java Beans)
JSP (JavaServer Pages)
JMS (Java Message carrier)
JTA (Java Transaction API)
Java Activation Framework (JAF)
JAXP (Java API for XML Parsing)
Java 2 Connector structure (J2C)
JAAS (Java Authentication and Authorization service)
1.0desk 3.2. J2EE 1.four technologies implemented via WebSphere 5.0.
J2EE 1.4 technology
JAX-RPC (Java API for XML-based mostly RPC)
SAAJ (cleaning soap with Attachments API for Java)
JMX (Java management Extensions)
moreover the required applied sciences for J2EE 1.3, WebSphere software Server 5.0 implements a pair of J2EE-appropriate technologies in boost of befriend of J2EE 1.4. In particular, WebSphere too helps technologies which can breathe required in J2EE 1.four (table three.2).
probably the most appealing points of expostulate know-how is its potential to amalgamate feature and facts right into a lone point, too referred to as an object. Arguably, a lone expostulate implementation could breathe labeled as a part, but components proffer extra performance than offering entry to information and performing services towards this statistics. Flexibility is done with designs that may consist of distinctive classes connected through composition and inheritance. The word factor implies that they're a Part of whatever thing whole, indicating that accessories require some shape of reference problem space the dwelling they can too breathe applied. The J2EE specification gives this frame of reference for components that can breathe used, prolonged and mixed by means of developers to carry efficacious commercial enterprise applications.
J2EE add-ons described for the platforms exploit the OO nature of Java by making employ of design patterns that provide both white and black container extensibility and configuration alternate options. The platform add-ons employ inheritance and composition right through their design, featuring a way for custom configuration by way of developers. also, defining components in an summary method can enable programs developed the employ of those add-ons to travail inspite of how every vendor implements every concrete factor implementation.
gaining lore of these design ideas employed within the platform implementations can back fabricate your personal designs extra stylish. These expostulate design innovations are nothing fresh and were utilized complete over the years in different OO languages. Two design topics that engage different approaches in supporting component configuration are discussed in here sections.
builders can now collect their fingers on an early version of IBM's WebSphere application Server V6 -- the primary essential seller-released utility suite to breathe Java 2 enterprise version-compliant.
The down load, attainable on IBM's DeveloperWorks web site, offers developers the means to birth working immediately with the brand fresh J2EE 1.4 incurious on the WebSphere application Server code base, mentioned Bob Sutor, director of IBM's WebSphere utility unit.
"We want to collect this in the fingers of builders," Sutor talked about. "We want them to kick the tires, collect them on the brand fresh expertise and prepare for the complete product liberate, that allows you to occur within the 2d half of the yr."
here's a core piece of internet-primarily based technology, stated Jason Bloomberg, a senior analyst with research company ZapThink LLC, Waltham, Mass. whereas IBM is clearly the greatest player within the application server utility market, it does acquire its competition, namely from BEA systems Inc., which sells WebLogic, and from Microsoft, with its .internet platform. Bloomberg illustrious that IBM has to breathe sure the tools are available for developers and ISVs to play with -- in spite of the fact that this downloadable code is truly a stripped-down edition of the remaining release.
"here is complete about client acceptance," he talked about. "IBM desires to fabricate inescapable they're no longer losing intellect share to BEA or Microsoft."
WebSphere V6 is IBM's subsequent-era integration platform for constructing out service-oriented architectures (SOAs), with pilot for brand spanking fresh net features requirements, the latest J2EE Connector Adapter standards, plus other elements that could breathe protected in the complete version.
In an SOA world, traffic tasks are achieved by using executing a sequence of "features," or jobs that acquire well-defined ways of communicating. These capabilities more and more are required for IT stores where application and hardware from diverse carriers are deployed and techniques are created through distinctive building groups.
doubtless the most notable factor to this free up of WebSphere is the assist for J2EE 1.four, Bloomberg talked about. J2EE is a key platform for setting up internet functions functions, and J2EE 1.four changed into these days authorised through solar Microsystems Inc.'s Java neighborhood manner. J2EE 1.four offers pilot for the J2EE Connector Adapter (JCA) 1.5, which allows for for the combination of disparate traffic applications, akin to utility from SAP AG and PeopleSoft Inc.
Equally faultfinding is that J2EE 1.four helps the WS-I's basic Profile. The primary Profile is a collection of guidelines that lets businesses examine and certify that web features applied sciences are interoperable with other platforms. The WS-I, or internet features Interoperability organization, is supported with the aid of IBM, amongst others.
In late 2000, Atlanta-primarily based countrywide Account provider Co. (NASCO), which procedures more than one hundred million health-merits claims every year, turned into looking for an internet application server to give consumers the skill to assess their claims on-line. That statistics remains hosted on IBM mainframes. So whereas BEA's WebLogic had more suitable pilot for Java necessities on the time, "WebSphere provided us greater elements built-in with an IBM environment," says impress Badia, NASCO's chief technology officer. for instance, he says, WebSphere helps mainframe file buildings and works smartly with IBM's MQ message-queuing middleware.
IBM likes to tout WebSphere's ability to Run on varied hardware programs, including mainframes, but the company has had situation preserving consistency throughout them at times. Aurora health Care, a health-care provider based in Milwaukee, runs WebSphere on AIX and z/OS for mainframes but its builders travail on windows and Linux machines. Frustratingly, WebSphere code developed on one platform behaved in another way on a further, in response to Duane Wesenberg, director of internet purposes construction at Aurora fitness. "We were always having problems after they promoted an software as much as the large iron," Wesenberg says. IBM has fixed the problem in recent releases, he says.
WebSphere is additionally mind-numbingly complex, some consumers say. "if you're now not integrating an software to a back-conclusion system, i would not examine WebSphere," says Todd Stewart, director of suggestions expertise for Brenntag North the usa, a subsidiary of a German chemical distributor. "i am inclined to tackle the complexity as a result of the advantages they collect from the platform."
however others squabble that WebSphere is no extra intricate to collect your fingers around than BEA's WebLogic. "The stage of complexity for either platform is rather shut," says Roman Lys, an suggestions-know-how manager with Toronto-based mostly Scotiabank, which runs its online banking applications on WebSphere. the most essential challenge for groups embarking on Java building, he says, is constructing skills in-apartment.
IBMNew Orchard RoadArmonk, huge apple 10504(914) 499-1900www.ibm.com/websphere
Ticker: IBM (NYSE)employees: 255,157
Steve MillsSenior VP, software GroupIn cost of large Blue's $14 billion software company unit, which encompasses 13,000 direct income and technical befriend personnel. He joined IBM in 1974 as a income trainee in huge apple metropolis.
Bob SutorDir., WebSphere groundwork SoftwareResponsible for complete WebSphere infrastructure application. Spent 15 years in IBM's analysis division, the dwelling he labored on cyber web-publishing technology.
ProductsMore than one hundred IBM items elevate the WebSphere moniker, but the main application is the WebSphere utility Server, a web-based transaction engine obtainable for discrete operating programs, including IBM's z/OS and AIX. WebSphere Studio offers an environment for constructing, deploying and testing functions that comply with the Java 2 enterprise version (J2EE) specification.
NascoMark BadiaCTOmark.firstname.lastname@example.orgProject: health-benefits processing company constructed a Java-based internet application on WebSphere that lets individuals analysis claims and operate other activities.
Highmark life & CasualtyMatt PirochCIOmatt.email@example.comProject: Pittsburgh insurance company runs customized Java applications on WebSphere for claims processing and underwriting processing, which can breathe tied into an Oracle database.
Brenntag North AmericaTodd StewartDir., I.T.(610) 926-6100Project: Chemical distributor's WebSphere servers provide order processing and product catalogs linked without detain to its AS/400 systems.
ScotiabankRoman LysAsst. established Mgr., arm architecture Developmentroman.firstname.lastname@example.orgProject: Toronto-based mostly bank makes employ of WebSphere to deliver online access to existing banking applications, which hold three million lines of Cobol on an IBM mainframe.
Aurora fitness CareDuane WesenbergDir., internet Apps Developmentduane.email@example.comProject: Wisconsin fitness-care provider lets its 24,000 employees entry 30 net applications via WebSphere.
Hewitt AssociatesTim HilgenbergChief know-how Strategist for Applicationstim.firstname.lastname@example.orgProject: Human-components consulting company links to mainframe records with WebSphere, serving 5 million internet pages per day.
Executives listed listed below are complete users of IBM's items. Their willingness to talk has been confirmed by means of Baseline.
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This chapter shows how to create different kinds of projects to build applications. It too introduces some of the advanced project features that are available with WTP and explains how to employ advanced WTP features to create project templates and apply best practices that are helpful to organize your progress work.This chapter is from the book
In this book they relate how to build applications that are defined by the J2EE specification. When you build an application, you create one or more projects that correspond to J2EE modules. You too employ these very projects to organize your progress work; that is, you employ these projects
This chapter starts with a basic description of the types of applications and projects that are supported in WTP. They will elucidate you how to create different kinds of projects to build applications.
In the second Part of the chapter, they will relate some of the advanced project features that are available with WTP. There is very Little available in terms of standards to pilot you in the organization of project artifacts and source code for Web projects. Project best practices achieve a equilibrium between the concerns that drive a particular progress project:
Naturally, each concern is a different dimension of the project. They will employ advanced WTP features to create project templates and apply best practices that are helpful to organize your progress work. They employ the generic term Web project to relate the WTP project types that are provided for J2EE development.
A project is used to develop modules such as J2EE Web applications and EJBs. Typically, each module is a project, but this is not a strict requirement (see figure 6.1).
For example, in a complete J2EE enterprise application, one project might consist of a Web application module for the presentation logic while another would breathe used to develop the EJB module for the traffic components. In this case, the complete application consists of three projects for the modules: one for the enterprise application, one for the Web application, and one for the EJBs. It is too viable to split the progress of a lone module into multiple projects. For example, a basic module fancy a Web application might breathe built from utility modules built in other projects. You will learn how to organize your projects and modules using similar patterns later in this chapter.Web Projects
Projects organize your source code and modules. WTP provides Web projects that are sophisticated Eclipse projects that know about J2EE artifacts. In addition to having basic Java project capabilities, a Web project can breathe used to organize J2EE artifacts into buildable, reusable units (see figure 6.2).
An Eclipse simple project (or generic project) provides the basic infrastructure to organize and build resources. The structure of a generic project is very open; resources such as files and directories can breathe organized in any capricious shape that makes sense for a particular purpose.
A JDT Java project contains Java elements such as packages, types, methods, fields, and property files for creating Java programs. A Java project knows how to build and Run Java programs. Each Java project has a Java builder that can incrementally compile Java source files as they are edited.
You can change the properties of a Java project, such as the Java build path. The build path is the classpath that is used for building the project. There are alternative ways of structuring the sources in a Java project; examples comprise using a lone source folder that is the project root or multiple source folders for organizing knotty Java projects.
A WTP Web project has more than just Java code. It contains sources that are used to build Web applications, EJBs, and enterprise applications. A Web application can breathe as simple as a bunch of HTML files, or it can acquire servlets, JSPs, tag libraries, and Web services. These artifacts fabricate the Web application. A Web project knows how to build, publish, and Run J2EE modules and artifacts on application servers.
Web projects acquire builders, validators, and code generators. Builders defer standard publishable modules from knotty progress layouts. Validators befriend identify and entangle coding errors at progress time. J2EE validators are very valuable, because the sooner you find a problem the easier it is to fix. In J2EE, there are many deployment descriptors that acquire references to Java code and each other. These are interrelated in knotty ways. Failure to entangle a problem at progress time could lead to a runtime oversight that might breathe very difficult to diagnose and fix. Generators create components from annotations in source code (for example, using XDoclet or JSR 175).J2EE Modules
The output of the progress activities are discrete J2EE components (EJBs, servlets, application clients), which are packaged with component-level deployment descriptors and assembled into J2EE modules. Web application modules, EJB modules, enterprise application modules, and Java 2 Connector Architecture (J2CA) resource modules are typical J2EE modules. A module contains code, resources, and deployment descriptors. A J2EE module forms a stand-alone unit, which can breathe deployed and Run on a J2EE application server. figure 6.3 provides an overview of the J2EE structure associated with common J2EE modules, such as Web, EJB, and EAR, as described by the specification.Creating Applications
WTP provides projects and wizards to befriend you collect started quickly with different types of Web and J2EE applications. You can employ these wizards to create most standard Web and J2EE artifacts. Additional tools will befriend you create, build, validate, and Run your applications on servers.
To collect started, they will review the steps involved in creating different types of applications. The simple steps provided in this section will befriend you acquire the skills you will necessity to travail with the examples in this book. More specifically, you will learn how to create these types of projects:
To build a Web application you necessity a project that contains a Web module. There are two types of Web projects: static and dynamic.
Static Web projects hold resources that provide static content. You can employ a static Web project to develop Web applications that hold many of the standard Web resources, such as HTML, images, CSS, and XML, and test them using a Web browser. These projects can breathe deployed to a conventional Web server, such as the Apache HTTP Server, that has no J2EE capabilities.
Dynamic Web projects are for J2EE Web applications that hold servlets, JSPs, and filters, in addition to static content. A dynamic Web project can breathe used as a stand-alone Web application, or it can breathe combined with other modules to create a J2EE enterprise application.
The J2EE specification defines a standard for Web application directory structure. It specifies the location of static Web files, JSPs, Java class files, Java libraries, deployment descriptors, and supporting metadata. The default dynamic Web project layout resembles the structure of a J2EE Web application module. In the workbench, you can employ the fresh Web Project wizard to create a fresh Web project. WTP has back for other types of project layouts and can automatically build a J2EE Web application archive (WAR) structure defined by the standard.
When you want to create a dynamic Web project, you will typically Do the following:
You can try these steps by repeating the following:
Enter LeaguePlanetWebProject for the project name. A dynamic Web project contains J2EE components such as JSPs and servlets. It is necessary for J2EE APIs to breathe a Part of the project classpath. This is done for you automatically when you associate a J2EE server runtime with the project. The runtime provides a set of libraries that will too hold JARs such as the servlet.jar. If you switch the runtime at a later time, the classpath is too updated. If your prefer not to employ a runtime to provide these libraries, you can create a folder that contains the J2EE libraries and point to it as your runtime library. However, this method will require you to obtain appropriate libraries for the J2EE APIs from
Assuming you acquire defined a server runtime such as Tomcat, select it as the target runtime. They will revisit servers and runtimes in other chapters.
Configurations allow you to pick a set of project facets for common styles of Web projects. For example, if you pick the WebDoclet configuration, WTP will set up the project to enable XDoclet.
Click the Next button. The Project Facets selection page is displayed (see figure 6.6).
Figure 6.8 Dynamic Web Project—LeaguePlanetWebProject
You acquire now created a dynamic Web project named LeaguePlanetWebProject and targeted it to Tomcat.
The Dynamic Web Project wizard creates folders and files under the project (see figure 6.9). Open the project you acquire just created and browse its contents. For example, the WebContent folder contains a special folder named WEB-INF, which holds items that are defined by the J2EE specification and are not accessible by a Web browser. The WEB-INF/classes folder is where compiled Java code goes. It too contains a special file, web.xml, which is the J2EE Web deployment descriptor.
The WebContent folder contains Web resources such as JSP and HTML files, and other types of supporting resources (see figure 6.9). The contents of WebContent will breathe accessible from the Web application context root.
The following default elements are created with a dynamic Web project:
A dynamic Web project can publish its contents as a Java Web application archive (WAR) file (see figure 6.10). Publishers assemble the artifacts in a Web project, such as Java sources; Web content, such as JSPs, HTML, and images; and metadata, such as Web deployment descriptors, in a shape that can Run on a J2EE application server.
WTP wizards simplify the tasks involved in creating J2EE modules. They acquire just shown how to create a Web module. WTP online documentation at
provides particular information about these wizards and the project structure. The process of creating an EJB application is equally simple. The next section describes how to create an EJB project that contains an EJB module.Creating EJB Applications
An EJB project contains an EJB module. This project can breathe used to assemble one or more enterprise beans in a lone deployable unit. EJBs are deployed in a standard Java archive (JAR) file. An EJB project can breathe used to build stand-alone components, or it can breathe combined with other modules in a J2EE enterprise application (EAR).
Recall the structure of an EJB module (see figure 6.3 earlier). EJB modules acquire a simple structure that contains EJB classes and deployment descriptors. In the workbench, they can employ the fresh EJB Project wizard to create a fresh EJB project with an EJB module in it.
When you want to create an EJB project, you will typically Do the following:
You may notice some errors in the fresh EJB project. For example, if your EJB project does not hold any EJB components, this is considered an oversight according to the J2EE specification. If you chose the XDoclet facet and an XDoclet runtime is not yet configured, this will elucidate up in the problem markers. These errors are regular and will breathe removed when you fix the preferences and add EJBs to the project.
The ejbModule folder contains Java and EJB resources such as the deployment descriptor (see figure 6.16).
Similar to Web application modules, an EJB project has a publisher for EJB applications (see figure 6.17). This publisher creates a deployable EJB module from the contents of the project with complete the classes and deployment descriptors.
This completes the process of creating an EJB project. The next section describes how to create an enterprise application project that can combine EJB and Web modules in a J2EE Enterprise Application (EAR) module.Creating Enterprise Applications
The most inviting J2EE enterprise applications acquire more than one module. They acquire several Web applications and EJB modules. The J2EE specification provides a basic application packaging structure called an enterprise application. Enterprise application archives are packaged as Java archives with the .ear suffix. Therefore, they are too known as EARs. An EAR can hold one or more
An enterprise application project contains the hierarchy of resources that are required to deploy these modules as a J2EE enterprise application.
An enterprise application module contains a set of references to the other J2EE modules that are combined to compose an EAR. In addition to the modules, an enterprise application module too includes a deployment descriptor, application.xml.
Publishers for enterprise application projects consume the output of the publishers from their component modules (see figure 6.18). For example, the builder of an EAR that contains a Web application module and an EJB module waits until the builder for the Web and EJB projects creates the deployable structures for these modules, and then it assembles these artifacts in the EAR.
WTP has wizards and tools to create and edit EARs. They are described in the following employ cases.Create a fresh Web or EJB Module in an EAR
When a fresh J2EE module project is created, such as a dynamic Web project or an EJB project, it can breathe associated with an enterprise application project (see figure 6.19). The project wizards let you specify a fresh or existing enterprise application. You can too pick the project in which you would create the enterprise application module. Finally, the EAR is updated to comprise the fresh J2EE module in it.Adding Existing Web and EJB Modules to an EAR
In the second scenario there are existing J2EE modules, which are to breathe added to a fresh enterprise application. You create a fresh EAR project and add your existing modules to it. The Enterprise Application wizard creates a fresh project and allows you to pick the modules to breathe included in it.
When you want to create an EAR project, you will typically Do the following:
In the final scenario, you modify the modules in an EAR. You can add fresh modules to an EAR or remove existing ones by using the J2EE Module Dependencies property page.
When you want to modify an EAR project, you will typically Do the following: In the Project Explorer, highlight the enterprise application LeaguePlanetEar, right click, and select Properties. As figure 6.25 shows, you can then pick the modules to breathe included in the EAR.
EAR modules acquire a simple structure. When modules are added or removed from an EAR, WTP automatically updates the module and the contents of the EAR deployment descriptor, application.xml, which is stored in the META-INF directory.
According to technology job board Dice’s October report, there’s one particular tech talent now in short supply across the U.S.: Microsoft’s .NET. Job postings requiring .NET are up more than 25% year-over-year, the company says – faster growth than the total job postings on complete of Dice.com.
In addition, 27% of the searches in Dice’s resume database involve those looking for .NET skills and an sustain flush of 0-3 years. 46% of searches were for those with 4-7 years sustain in .NET, and 21% were looking for .NET developers with 8-10 years experience.
Why the shortage? Dice believes that developers are worrying that if they specialize in .NET development, they won’t breathe able to arm out to other platforms. They too aren’t paid as much as those who specialize in other areas. For example, .NET developers earn around $83,000 per year, but Java developers typically make more than $91,000.
However, Dice says that there are now over 10,000 jobs on its site requesting the skill set, and that if exact continues to outstrip supply, wages will adjust accordingly.
Dice isn’t the only outfit reporting increased interest in .NET talent. In September, WANTED Analytics, a source of real-time traffic intelligence for the talent marketplace, reported similar trends. It create that .NET was one of the most commonly advertised job titles along with Java Developer, Web Developer, Sharepoint Developer, Web Designer, PHP Developer and J2ee Developer.
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