Javaâ¢ Application Development on Linux - Dator

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518Chapter 23Deploying EJBsautomate the building of many of the EJB files and deployment descriptors.Recall that Java comments can include special Javadoc tags, such as @authorand @param. Javadoc uses these tags to generate HTML files that are the documentationof your Java classes and methods based on the text associated withthese tags. XDoclet takes this a step further and defines tags like @ejb.beanand a few dozen more. Then, using the Javadoc mechanism, it can generate allthe various pieces required for an EJB. Used this way, you can write a singlesource file for your EJB, and have XDoclet generate the various home, remote,and local interfaces as well as the deployment descriptors.So why aren’t we all using XDoclet? It has been around for a few years andis gaining a following in the development community. We may be moving inthat direction, but it will take some time. It adds yet another layer to what isneeded to build an EJB application, albeit a layer that brings some simplification.Later releases of EJB specifications from Sun may subsume its EJB functionality.However, it is still very important to understand the pieces that gotogether to make an EJB application. One of the favorite quotes from XDocletin Action by Craig Walls and Norman Richards says it well: “Don’t generatewhat you don’t understand.”23.5ABSTRACTING LEGACY APPLICATIONSOne of the best uses of J2EE technology, particularly the EJB technology, is toprovide a single common interface to heterogenous systems. If an applicationprovides any sort of file, data, pipe, or network access to its data, you can wrapan EJB interface around it and make it available to an entire distributed network.This can be a powerful way to leverage investments in legacy systemswith modern multitier architectures.While it is commonplace for EJB applications to interface directly to a relationaldatabase back end, there is no requirement that such a system be theback end. IBM, for example, provides Java interfaces to their mainframe legacydata systems, such as CICS.23.6REVIEWWe’ve looked at the contents of an EAR file—not that you’ll need to be digginginside them or even building them by hand, but you’ll want to know what’sinside so as to understand what it takes to put one together. We took a look at
23.8 Resources519Ant and CVS and how they can be used together to make building anddeployment easier. We even mentioned XDoclet, another tool worth knowingsomething about.23.7WHAT YOU STILL DON’T KNOWJBoss has an IDE plug-in for Eclipse which uses XDoclet to provide an integrateddevelopment environment for writing EJBs. If you are working with Eclipseand are going to be doing a lot of EJB development, you should definitelyexplore this option.The EJB 3.0 specification, due out within a year, promises to change allthis, at least somewhat. With support for metadata in Java 1.5 there will be astandardized mechanism available for use in EJB class construction anddeployment. Look for some significant improvements in usability.23.8RESOURCES• Visit http://geronimo.apache.org for the latest information onGeronimo.• Visit http://www.jboss.org for the latest information on JBoss.For more information about all the tags that can be put into the variousXML configuration files, look at the DTD files which define them, for example:• http://java.sun.com/dtd/ejb-jar_2_0.dtd• http://www.jboss.org/j2ee/dtd/jboss.dtd• http://www.jboss.org/j2ee/dtd/jboss-web.dtdXDoclet in Action by Craig Walls and Norman Richards (Manning Publications,ISBN 1932394052) covers the Open Source XDoclet tool for automatingthe generation of Java code and related files (e.g., deployment descriptors).
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Java Application
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Java Application
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To my mother, for her love of words
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viiiContents1.41.51.6Chapter 22.12.
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xContents5.65.75.85.95.105.115.125.
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xiiContentsChapter 99.19.29.39.49.5
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xivContentsChapter 1313.113.213.313
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xviContentsChapter 1717.117.217.317
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xviiiContents20.620.720.820.920.102
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PrefaceJAVA AND LINUXWhy another bo
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PrefacexxiiiFREE SOFTWARE AND JAVAG
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Prefacexxvand Tyrrell Albaugh, who
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xxviiiIntroductionIf you are an exp
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xxxIntroductionThe Linux Newbie Pat
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Part IGetting Started
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4Chapter 1An Embarrassment of Riche
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10Chapter 1An Embarrassment of Rich
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Chapter 2An Embarrassment of Riches
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2.2 Eye to Eye with vi35of their co
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2.2 Eye to Eye with vi37• L (“l
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2.2 Eye to Eye with vi39In both cas
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2.2 Eye to Eye with vi41• :7,.w!
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2.2 Eye to Eye with vi431,$s/Tryout
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2.3 Editors Galore45affected by thi
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2.3 Editors Galore47has a huge lear
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2.6 Resources49• fte is an editor
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52Chapter 3An Experienced Programme
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100Chapter 4Where Am I? Execution C
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116Chapter 5The Sun Microsystems Ja
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168Chapter 6The IBM Developer Kit f
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Chapter 7The GNU Compiler for Java(
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7.4 Compiling Our Simple Ap
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7.4 Compiling Our Simple Ap
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7.5 Options and Switches1857.5OPTIO
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7.9 What You Still Don’t Know187o
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Chapter 8Know What You Have:CVSSour
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8.2 Source Control: Whys and Hows19
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8.3 A GUI: jCVS211and the differenc
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8.4 Review213Figure 8.7 jCVS checko
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Chapter 9Ant:An IntroductionAnt 1 i
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9.3 Obtaining and Installing Ant217
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9.3 Obtaining and Installing Ant219
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9.4 A Sample Ant Buildfile221standa
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9.4 A Sample Ant Buildfile2239.4.2.
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9.4 A Sample Ant Buildfile225$ antB
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9.4 A Sample Ant Buildfile227debugI
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9.4 A Sample Ant Buildfile229Exampl
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9.4 A Sample Ant Buildfile231Runnin
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9.7 Resources233• O’Reilly has
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236Chapter 10Integrated Dev
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Chapter 11Balancing Acts:An Imagina
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11.3 How to Develop Software265soft
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11.4 What Makes a Good Requirement2
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11.6 Requirements for the Budget <s
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11.6 Requirements for the Budget <s
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11.7 Documenting, Prototyping, and
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11.7 Documenting, Prototyping, and
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11.11 Exercises277• http://www.pr
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Chapter 12Analysis and Design:Seeki
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12.4 Finding the Objects281Accounta
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12.5 Finding the Methods and Attrib
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12.6 Essential and Nonessential285
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12.7 Analysis Paralysis287• Class
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12.12 Resources28912.9CORE CLASSESS
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12.12 Resources291if (dbConn != nul
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12.13 Exercises293Example 12.2 The
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296Chapter 13JUnit: Automating Unit
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Chapter 14Storing the DataIn this c
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14.5 Oracle, PostgreSQL, MySQL31714
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14.7 Beyond the Basics319files, and
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14.7 Beyond the Basics321Hibernate
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14.9 Setting Up PostgreSQL for Budg
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14.10 Review32514.9.4 Straight JDBC
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Chapter 15Accessing the Data:An Int
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15.3 Making Connections329These thr
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15.3 Making Connections331Example 1
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15.4 Querying Data333// queryString
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15.5 Getting Results335TIPThe case
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15.9 Resources337We haven’t cover
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Part IIIDevelopingGraphical User In
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342Chapter 16Getting in the Swing o
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378Chapter 17Other Ways: Alternativ
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Part IVDevelopingWeb Interfaces
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404Chapter 18Servlets: Java Pressed
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Chapter 19JSP:Servlets Turned Insid
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19.2 Servlets Turned Inside Out: JS
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19.3 How to Write a JSP App
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19.5 Review439into JSP files. The m
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19.8 Exercises441To get it straight
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444Chapter 20Open Source Web <stron
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Page 554 and 555: 522Chapter 24Parting ShotsThe three
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Page 558 and 559: 526Appendix AASCII ChartInt Oct Hex
Page 560 and 561: 528Appendix BA Java Swing GUI for B
Page 571 and 572: Appendix CGNUGeneral Public License
Page 573 and 574: C.2 Terms and Conditions for Copyin
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Page 577 and 578: C.3 NO WARRANTY545of this License,
Page 579: C.5 How to Apply These Terms to You
Page 582 and 583: 550Index$ (dollar)in format fields,
Page 584 and 585: 552Indexbreak statement, 67, 74-75b
Page 586 and 587: 554IndexCVS_RSH environment variabl
Page 588 and 589: 556IndexFfail(), 307false constant,
Page 590 and 591: 558IndexIBM, 236, 377, 518Common Pu
Page 592 and 593: 560IndexJNDI (Java Naming and Direc
Page 594 and 595: 562IndexNetBeans (continued)running
Page 596 and 597: 564IndexScrollBar class, 385search
Page 598 and 599: 566IndexTable class, 386, 394-395ta
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