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This chapter described Java's evolution from an preliminary method of offering client/server classification functions by way of the web, to a sturdy OO platform that may guide giant-scale multiuser business purposes.This chapter is from the e-book
through the years, the Java expertise platform has grown out of its normal applet customer/server origins into a robust server-side development platform. initial platform packages brought developed-in threading support and offered abstractions to I/O and networking protocols; newer models of the Java application construction kit (SDK) persisted to enhance these abstractions and introduce more moderen framework choices.
The momentum of producing technology frameworks assisting commercial enterprise server-based construction has persevered, and has been formalized into the J2EE platform offering. the incentive of this providing is to deliver builders with a collection of applied sciences that guide the beginning of robust enterprise-scale software methods. IT authorities are offered with an ever- changing company and know-how panorama. know-how experts should balance the calls for for new automation necessities in opposition t the existence of latest line of enterprise functions; easily using the expertise du jour perpetuates the problem of integrating existing legacy techniques. The purpose of the J2EE platform is to offer a constant and professional method through which these demands may also be met with purposes that possess the following qualities:
excessive Availability— guide and exist in a 24/7 global company environment.
relaxed— ensure consumer privacy and self belief in company characteristic and transactions.
legitimate and Scalable— guide excessive volumes of company transactions accurately and in a timely method.
This chapter presents a top level view of the J2EE structure, a brief discussion of the specification's part design and the options they supply, and describes which J2EE applied sciences this booklet will center of attention on.
First, some historical past.
All J2EE technologies are developed upon the Java 2 regular version (J2SE). It comprises basic platform classes, such because the Collections framework, along with more specific programs reminiscent of JDBC and other applied sciences that aid client/server-oriented purposes that users interact with through a GUI interface (e.g., drag-and-drop and assistive applied sciences). be aware that platform technologies are not limited to framework implementations. They also encompass construction and runtime guide equipment such because the Java Platform Debugger architecture (JPDA).
technologies certain to developing robust, scalable, multitiered server-based mostly business applications are offered within the J2EE platform providing. while nevertheless aiding customer/server- based mostly architectures, J2EE platform applied sciences provide aid for dispensed computing, message-oriented middleware, and dynamic web web page building. This chapter and most of this ebook will deal primarily with some of those technologies. In selected, WebSphere 5.0 (the center of attention of this publication) implements the J2EE 1.three platform specification. a listing of the applied sciences from J2EE 1.three (along with the supported ranges) is proven in desk three.1.table 3.1. J2EE technologies.
degree required via J2EE 1.three
Java IDL (Interface Definition Language) API
(offered by way of J2SE 1.3)
JDBC Core API
2.0 (offered via J2SE 1.three)
(supplied through J2SE 1.3)
(offered with the aid of J2SE 1.three)
EJB (business Java Beans)
JSP (JavaServer Pages)
JMS (Java Message service)
JTA (Java Transaction API)
Java Activation Framework (JAF)
JAXP (Java API for XML Parsing)
Java 2 Connector structure (J2C)
JAAS (Java Authentication and Authorization provider)
1.0desk three.2. J2EE 1.4 applied sciences applied by means of WebSphere 5.0.
J2EE 1.four know-how
JAX-RPC (Java API for XML-based RPC)
SAAJ (cleaning soap with Attachments API for Java)
JMX (Java administration Extensions)
apart from the mandatory technologies for J2EE 1.3, WebSphere application Server 5.0 implements a few J2EE-appropriate technologies in develop of aid of J2EE 1.four. In particular, WebSphere additionally supports applied sciences which could be required in J2EE 1.four (table three.2).
probably the most appealing facets of object expertise is its potential to mix function and records into a single point, also referred to as an object. Arguably, a single object implementation could be classified as a element, however add-ons present more performance than proposing entry to statistics and performing capabilities towards this facts. Flexibility is accomplished with designs that may encompass dissimilar classes connected via composition and inheritance. The notice component implies that they're part of something whole, indicating that components require some type of reference issue space where they will also be applied. The J2EE specification provides this frame of reference for components that can also be used, extended and combined by developers to deliver powerful business purposes.
J2EE components described for the platforms exploit the OO nature of Java via applying design patterns that provide each white and black field extensibility and configuration alternate options. The platform components use inheritance and composition right through their design, featuring a means for custom configuration by using developers. additionally, defining add-ons in an abstract approach can allow techniques constructed the use of those add-ons to work despite how each and every vendor implements each and every concrete element implementation.
getting to know these design recommendations employed in the platform implementations can assist make your personal designs greater elegant. These object design techniques are nothing new and were utilized right through the years in other OO languages. Two design issues that take distinctive approaches in supporting component configuration are mentioned in right here sections.
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This chapter shows how to create different kinds of projects to build applications. It also introduces some of the advanced project features that are available with WTP and explains how to use advanced WTP features to create project templates and apply best practices that are helpful to organize your development work.This chapter is from the book
In this book we describe 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 also use these same projects to organize your development work; that is, you use these projects
This chapter starts with a basic description of the types of applications and projects that are supported in WTP. We will show you how to create different kinds of projects to build applications.
In the second part of the chapter, we will describe some of the advanced project features that are available with WTP. There is very little available in terms of standards to guide you in the organization of project artifacts and source code for Web projects. Project best practices achieve a balance between the concerns that drive a particular development project:
Naturally, each concern is a different dimension of the project. We will use advanced WTP features to create project templates and apply best practices that are helpful to organize your development work. We use the generic term Web project to describe 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 be used to develop the EJB module for the business 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 also possible to split the development of a single module into multiple projects. For example, a basic module like a Web application might be 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 be used to organize J2EE artifacts into buildable, reusable units (see Figure 6.2).
An Eclipse simple project (or general project) provides the basic infrastructure to organize and build resources. The structure of a general project is very open; resources such as files and directories can be organized in any arbitrary form 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 include using a single source folder that is the project root or multiple source folders for organizing complex 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 be as simple as a bunch of HTML files, or it can have servlets, JSPs, tag libraries, and Web services. These artifacts make the Web application. A Web project knows how to build, publish, and run J2EE modules and artifacts on application servers.
Web projects have builders, validators, and code generators. Builders produce standard publishable modules from complex development layouts. Validators help identify and catch coding errors at development 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 have references to Java code and each other. These are interrelated in complex ways. Failure to catch a problem at development time could lead to a runtime error that might be 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 development 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 be 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 help you get started quickly with different types of Web and J2EE applications. You can use these wizards to create most standard Web and J2EE artifacts. Additional tools will help you create, build, validate, and run your applications on servers.
To get started, we will review the steps involved in creating different types of applications. The simple steps provided in this section will help you acquire the skills you will need to work with the examples in this book. More specifically, you will learn how to create these types of projects:
To build a Web application you need a project that contains a Web module. There are two types of Web projects: static and dynamic.
Static Web projects contain resources that provide static content. You can use a static Web project to develop Web applications that contain many of the standard Web resources, such as HTML, images, CSS, and XML, and test them using a Web browser. These projects can be 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 contain servlets, JSPs, and filters, in addition to static content. A dynamic Web project can be used as a stand-alone Web application, or it can be 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 use the New Web Project wizard to create a new Web project. WTP has support 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 be 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 also contain JARs such as the servlet.jar. If you switch the runtime at a later time, the classpath is also updated. If your prefer not to use 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 have defined a server runtime such as Tomcat, select it as the target runtime. We will revisit servers and runtimes in other chapters.
Configurations allow you to choose a set of project facets for common styles of Web projects. For example, if you choose 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 have 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 have 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 also 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 be 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 form that can run on a J2EE application server.
WTP wizards simplify the tasks involved in creating J2EE modules. We have just shown how to create a Web module. WTP online documentation at
provides detailed 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 be used to assemble one or more enterprise beans in a single deployable unit. EJBs are deployed in a standard Java archive (JAR) file. An EJB project can be used to build stand-alone components, or it can be combined with other modules in a J2EE enterprise application (EAR).
Recall the structure of an EJB module (see Figure 6.3 earlier). EJB modules have a simple structure that contains EJB classes and deployment descriptors. In the workbench, we can use the New EJB Project wizard to create a new 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 new EJB project. For example, if your EJB project does not contain any EJB components, this is considered an error according to the J2EE specification. If you chose the XDoclet facet and an XDoclet runtime is not yet configured, this will show up in the problem markers. These errors are normal and will be 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 all 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 interesting J2EE enterprise applications have more than one module. They have 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 also known as EARs. An EAR can contain 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 also 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 use cases.Create a New Web or EJB Module in an EAR
When a new J2EE module project is created, such as a dynamic Web project or an EJB project, it can be associated with an enterprise application project (see Figure 6.19). The project wizards let you specify a new or existing enterprise application. You can also choose the project in which you would create the enterprise application module. Finally, the EAR is updated to include the new 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 be added to a new enterprise application. You create a new EAR project and add your existing modules to it. The Enterprise Application wizard creates a new project and allows you to choose the modules to be 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 new 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 choose the modules to be included in the EAR.
EAR modules have 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.
Bolstering development of Web and enterprise J2EE applications in the open source arena, the Eclipse Foundation on Monday is set to release Version 1.0 of its Eclipse Web Tools Platform.
Version 1.0 features the official APIs for the platform, which had been available in previous incarnations with provisional APIs. "We're declaring ourselves ready as a platform for commercial adoption," said Tim Wagner, a project lead for the Web Tools Platform and senior manager on the BEA Systems Workshop team.
Web Tools Platform 1.0 will serve as precursor to a planned release of several Eclipse technologies simultaneously next June, via a bundle now dubbed "Callisto."
A top-level project at Eclipse, Eclipse Web Tools Platform features editors for Java and associated technologies. J2EE 1.4 is supported on the platform, which plugs in to the Eclipse open source IDE.
Vendors can use Web Tools Platform 1.0 as a base offering on which to add value for commercial purposes. BEA plans to implement the Web Tools Platform in its BEA Workshop development platform and equip it with functionality such as facilities for using for the Apache Beehive programming model and extended support for the BEA WebLogic Server application server.
The Web Services Explorer tool featured in Web Tools Platform 1.0 is a browser-based application allowing for discovery and invocation of Web services from within the platform. "It allows you to, for example, go out to discover a WSDL or Web service that's available on the Web and begin interacting with it directly," Wagner said. An example could be an Amazon Web service geared toward the Amazon product catalog; users would not have to write any code to get to the Web service.
Also featured are Java and WSDL code generation wizards that generate the portion of an application that accesses the Web service. Version 1.0 also has tools to configure and monitor servers and support debugging based on Java Specification Request 45.
The Web Tools Platform benefits both Eclipse and BEA, said Shawn Willett, principal analyst at Current Analysis. "It's definitely good news for BEA because while Workshop was a good tool, they need to put it on a standards basis. People are moving to Eclipse, and they needed to move with it," Willett said.
Eclipse gets enhanced functionality via the Web tools project, said Willett. "A Web development tool is in pretty high demand," and is something Eclipse needs, Willett said.
Web Tools Platform 1.0 features no direct support for Microsoft's .Net platform, although developers could use the tools within the platform to develop .Net support, Wagner said.
Callisto, to be officially known as Eclipse Platform 3.2, will feature a follow-up release of Web Tools Platform that features J2EE 1.5 tooling, including support for Java annotations, which allows for embedding of comments directly into code.
Other Eclipse offerings to be featured in Callisto include tools from the Data Tools Platform, Test & Performance Tools Platform, and Business Intelligence and Reporting Tools projects. The Eclipse IDE will be included as well.
The consolidated release of Eclipse technology is driven by efficiency. Users get all the technologies at once, and they will work together. "It will end the discovery problem" pertaining to Eclipse technologies by providing multiple offerings in one download, Wagner said. Commercial companies will be able to build products on top of Callisto.
Callisto is a natural evolution of the Eclipse platform, Willett said. "They're getting a lot more granular in terms of what Eclipse covers," he said.
Ready to get serious about learning Java Web application and enterprise application development? I can’t say I blame you — those skills will net a pretty penny in the current job market. That’s why J2EE Programming (with Passion!), a free online class offered by Sun Microsystems employee Sang Shin in his spare time, is such an amazing opportunity.
Offered by means of a Yahoo! Groups discussion list, the class runs for about the length of a university semester. Once you subscribe, you’re responsible for reviewing the weekly pre-class reading material, reading the classroom slides with accompanying notes, and completing the assigned coursework and final project by the assigned dates. It’s just like taking a university class only you don’t have to show up at lectures… oh, and did I mention it’s free?
If you’ve been awaiting an opportunity to learn J2EE in a structured way without shelling out a bunch of money on books and classes, this might just be the ticket. Sang Shin also offers a few other online classes, an advanced J2EE class among them.
The next session of J2EE Programming (with Passion!) starts September 26th. Time permitting, I plan to participate.
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