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310-083 - Sun Certified Web Component Developer for J2EE 5 - BrainDump Information

Vendor Name : SUN
Exam Code : 310-083
Exam Name : Sun Certified Web Component Developer for J2EE 5
Questions and Answers : 276 Q & A
Updated On : April 22, 2019
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310-083 Sun Certified Web Component Developer for J2EE 5

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310-083 exam Dumps Source : Sun Certified Web Component Developer for J2EE 5

Test Code : 310-083
Test Name : Sun Certified Web Component Developer for J2EE 5
Vendor Name : SUN
Q&A : 276 Real Questions

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SUN Sun Certified Web Component

The sun licensed internet component Developer (SCWCD) exam | killexams.com Real Questions and Pass4sure dumps

J2EE Certifications

J2EE (Java 2 business edition) expertise, unveiled by using sun Microsystems in 1999, has been broadly permitted for its unmatched server aspect capabilities. Many providers like IBM and BEA methods have come up with items for the J2EE platform. J2EE companies signify essentially ninety percent of the software server market.

With the development and increasing presence of J2EE applied sciences, J2EE certifications have also begun evolving and including incredible value to the careers of programmers, developers and architects. The domain of J2EE certifications has grown significantly, which is evident by using a growing to be variety of certification tests, increasing assist via blue chip agencies like sun, IBM, BEA and the expanding number of americans pursuing these certifications.

solar certified net component Developer is one of most everyday and advantageous certifications in the area of J2EE. this article will help you take note the aims, coaching requirements and supplies obtainable for this prestigious certification with the aid of solar Microsystems.

The sun licensed net part Developer (SCWCD) Certification examination exam historical past and its importance

Launched in August 2001 via solar Microsystems, the sun certified internet part Developer (SCWCD) Certification exam has occupied a spot of its own within the web accessories (particularly JSP and Servlets) developer neighborhood. a superior measure of server facet Java knowledge, this examination is fitting more and more important for builders.

if you are looking to prove your competency in "Java internet add-ons", this is the examination for you. additionally, when you are a programmer working in core Java, taking this exam will supply a particular advancement for your profession.

examination information
  • necessities - solar licensed Java Programmer (SCJP). the first step in opposition t SCWCD is SCJP (sun certified Java Programmer), which is the pre-requisite for this exam. You need to have a detailed and thorough figuring out of issues involving the design, building and implementation of quite a few Java web accessories.
  • targets - The SCWCD examination tests your abilities on quite a few facets of Java web components, specially JSPs, Servlets and JavaBeans. You deserve to have an in depth and thorough understanding of considerations involving the design, building and implementation of a lot of Java internet components. These are the targets of the examination precise by way of solar Micorosystems:
  • The Servlet mannequin
  • The constitution and Deployment of up to date Servlet web purposes
  • The Servlet Container mannequin
  • Designing and developing Servlets to tackle Server-facet Exceptions
  • Designing and constructing Servlets the use of Session management
  • Designing and setting up comfortable net purposes
  • Designing and setting up Thread-safe Servlets
  • The Java Server Pages (JSP) expertise mannequin
  • Designing and developing Reusable net components
  • Designing and setting up JSP pages using JavaBean accessories
  • Designing and establishing JSP pages the use of custom Tags
  • Designing and setting up a customized Tag Library
  • Design Patterns
  • For targeted suggestions check with the comprehensive examination pursuits for the SCWCD examination, via sun Microsystems.

  • class of Questions - like the SCJP exam, the classification of questions requested in the SCWCD examination are varied-option (with one or more suitable selections), fill in the blanks (often known as brief answer) and drag-n-drop (now and again requested). once again, just like the SCJP, if a assorted-alternative question has a couple of correct choice, it's explicitly stated in the query.
  • Time - The time allowed to complete this examination is 90 minutes, which is enough. as soon as once more, just like the SCJP, you're allowed to evaluate the query(s) in case you have some beyond regular time towards the end.
  • Passing % - You need to reap at the least sixty one% to be successful. The examination asks you 59 questions and also you should appropriately answer as a minimum 36.
  • constructive supplies
  • Books - Preparatory books are a valuable asset for any IT Certification training. here are some suggested books for the SCWCD exam:
  • necessities - it's highly suggested that pleasant time be spent going during the JSP 1.2 and Servlets 2.three necessities for this exam. you are going to find answers to many questions hidden in the specifications.
  • WebServer - "practice is PowerIf your goal is to get an in-depth knowing of the objectives in addition to scoring high on the exam, it's important so you might spend lots of time writing traces of code specializing in a variety of pursuits.

    however where do I apply?Tomcat Apache edition four.0 is the most excellent platform to apply on. It adheres to the newest JSP 1.2 and Servlet 2.three necessities and it is absolutely free. which you can down load it right here: Tomcat 4.0

  • Tutorials and Articles - There are a large number of tutorials freely accessible on Java internet accessories. The superior and suggested of those are through sun. Following is a list of some particularly positive tutorials and articles for the SCWCD exam:
  • Notes - Many americans have contributed by means of sharing their coaching suggestions and examination event within the sort of concise notes. Some of those helpful notes are listed below:
  • J2EE working towards - if you definitely are looking to gain potential in the J2EE domain, take a look at the excessive exceptional J2EE training provided by using The Middleware business.
  • Mock tests - after getting organized with the applicable books, browsed throughout the necessities, study the tutorials, articles and notes, there comes the deserve to follow for the exam. What can be better than taking a mock examination? unlike the SCJP, for which there are loads of good mock exams obtainable, there are only a handful of mock checks for the SCWCD exam:
  • examination Simulator - Is there whatever enhanced than a FREE mock exam?

    sure, a Certification check Simulator, which simulates the examination ambiance and provides you the greatest observe you could have earlier than you seem for the exam..

    SCWCD Certification examination Simulator from Whizlabs utility. Designed and developed by way of particularly dedicated, experienced, and certified authorities, it ensures your success within the exam with its excessive fine Mock assessments, Interactive Quiz and brief Revision counsel on the latest sample of the SCWCD exam.

  • suggestions and hints
  • observe every concept through writing the vital code. it is even enhanced in case you conceptualize, improve, deploy and check an software, which makes use of the concepts requested in the examination. A mock utility using HTML, JSP, and Servlets designed the use of the patterns like MVC may still be of top notch help in realizing essentially the most normal ideas for this examination.
  • The time attainable for the examination is often enough. are trying no longer to rush and provides ample time to each and every question.
  • if you in fact need to acquire a great rating, make sure you spend some time remembering a considerable number of Deployment Descriptor points, together with the mum or dad-child relationships between them. be sure you also know which of the aspects are mandatory.
  • Thread safeguard is considered to be some of the complex areas for this examination. You have to spend some useful time and have thorough knowing of it.
  • youngsters now not mentioned within the exam targets, make sure to have the primary understanding of here design patterns:
  • discussion forums and organizations

    Eventhough you have entry to all the components listed above, you may additionally are looking to hear about the experiences of different individuals. There are areas for these too:


    considering that its introduction greater than two years ago, the Java 2 Platform, enterprise version (J2EE), has unexpectedly centered a brand new model for developing allotted purposes. these days it has reached a undeniable level of maturity on which many blue-chip agencies are relying for his or her complicated business-application-building wants. With this evolution of the J2EE platform, there has grown the need for trade-identified J2EE certifications. The SCWCD is considered one of such recognized J2EE certification assessments, which checks your competence in Java web add-ons. Being a sun licensed web part Developer, that you would be able to aid improve your career expertise, gain more appreciate, and increase job security.

    i hope this article might be advantageous to you to your coaching for the SCWCD examination. I wish you good success!!!

    about the author

    Pradeep Chopra is the Co-founding father of WHIZlabs application, an e-researching company focusing on IT Certification examination Simulators. A graduate from the Indian Institute of technology, Delhi, Pradeep has been consulting for IT certifications and authored a large number of IT certification exam simulators, articles in J2EE certifications area. You may additionally find right here J2EE Certification examination Simulators through Whizlabs of your activity:

    that you would be able to reach him at pradeep@whizlabs.com

    pattern Questions

    Let's seem on the sort of questions asked during this examination.

    query 1 MyServlet import javax.servlet.*; import javax.servlet.http.*: import java.io.*; public classification MyServlet extends HttpServlet implements SingleThreadModel String myName; public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException response.setContentType("textual content/undeniable"); PrintWriter out = res.getWriter(); myName = req.getParameter("identify"); sayHello(out); out.shut(); public void sayHello(PrintWriter out) out.println("hey " + myName);

    select the relevant one:

    a.) MyServlet is thread secure.

    b.) MyServlet isn't thread protected as a result of myName is an instance variable.

    c.) MyServlet isn't thread safe as a result of MyServlet implements SingleThreadModel.

    d.) not one of the above.

    relevant choice



    choice A is correct. An application is thread safe if it all the time behaves predictably regardless of the number of concurrent threads running in its technique area. The simplest way to ensure that a servlet is thread safe is to implement the SingleThreadModel interface. through implementing this interface, the server guarantees that no multiple thread can execute the service(), doGet(), or doPost() formula at a time for a particular servlet instance. This makes the servlet thread safe. hence notwithstanding classification MyServlet has example variables, it's thread protected. for this reason A is the relevant choice and the different selections are unsuitable.

    query 2

    select the relevant two:

    a.) company Delegate - Reduces the coupling between presentation-tier shoppers and company services.

    b.) facts access Object - makes it possible for for varied Views the use of the equal model.

    c.) MVC - allows for more convenient migration to distinctive persistence storage implementations.

    d.) price Object - Reduces community site visitors

    proper choices

    A and D


    choices A and D are relevant. In a normal scenario, presentation-tier add-ons (e.g. a JSP) have interaction directly with business capabilities. due to this fact, the presentation-tier add-ons are liable to alterations within the implementation of the company features: when the implementation of the business functions trade, the code in the presentation tier ought to alternate. The intention of the business Delegate object design pattern is to reduce the coupling between presentation-tier customers and the enterprise provider API, for that reason hiding the underlying implementation details of the provider. for that reason option A is proper.

    choice B is wrong as it's the MVC design pattern instead of the DAO (facts entry Object), which offers diverse Views the usage of the equal mannequin.

    choice C is wrong as it's the DAO (records entry Object) sample, which makes it possible for easier migration to diverse persistence storage implementations.

    The price Object is used to encapsulate the enterprise statistics. A single formulation name is used to send and retrieve the value Object. When the customer requests business statistics from an business bean, the business bean can construct the value Object, populate it with its attribute values, and move it via price to the customer. hence option D is also relevant.

    Which of the following statements is right concerning ? Which of right here mixtures (Design pattern - Usefulness) concerning Design Patterns are correct?

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    Java Tip 138: Still parsing to generate your JavaBeans' XML representation? | killexams.com real questions and Pass4sure dumps

    The portability and extensibility of both Java and XML make them ideal choices for the flexibility and wide availability requirements of Web applications and services. SAX (Simple API for XML), DOM (Document Object Model), XSL (Extensible Stylesheet Language), XSLT (XSL Transformations), SOAP (Simple Object Access Protocol), and BML (Bean Markup Language) are some of the buzzwords associated with XML. This tip brings together the benefits of Java and XML without forcing developers to understand all XML-related buzzwords.

    By using Remote Method Invocation (RMI) in distributed Java application development, no low-level socket or network communication code is involved. The code remains at a higher level, leveraging its use of RMI classes. Similar gain comes with the use of Enterprise JavaBeans (EJB) technology, freeing developers from several low-level coding aspects (transaction, recovery, and activation). With this tip's JavaBean-XML mapping component, developers don't directly deal with XML-related APIs.

    Note: You can download this tip's source code from Resources.

    Write the component

    The BeanXMLMapping component converts a JavaBean to an XML document and vice versa. By using JavaBean introspection, XML parsers, and DOM APIs, you can develop this component with a toXML() method to represent the received bean as an XML document and a fromXML() method to instantiate and populate the proper bean according to the XML document received.

    Listing 1 shows a possible implementation for the BeanXMLMapping component. This particular implementation uses the JOX (Java Objects in XML) library. You can develop other implementations of this component using other APIs. I selected JOX for its simple, reusable solution.

    Listing 1. BeanXMLMapping component

    import com.wutka.jox.*; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class BeanXMLMapping { /** * Retrieves a bean object for the * received XML and matching bean class */ public static Object fromXML(String xml, Class className) { ByteArrayInputStream xmlData = new ByteArrayInputStream(xml.getBytes()); JOXBeanInputStream joxIn = new JOXBeanInputStream(xmlData); try { return (Object) joxIn.readObject(className); } catch (IOException exc) { exc.printStackTrace(); return null; } finally { try { xmlData.close(); joxIn.close(); } catch (Exception e) { e.printStackTrace(); } } } /** * Returns an XML document String for the received bean */ public static String toXML(Object bean) { ByteArrayOutputStream xmlData = new ByteArrayOutputStream(); JOXBeanOutputStream joxOut = new JOXBeanOutputStream(xmlData); try { joxOut.writeObject(beanName(bean), bean); return xmlData.toString(); } catch (IOException exc) { exc.printStackTrace(); return null; } finally { try { xmlData.close(); joxOut.close(); } catch (Exception e) { e.printStackTrace(); } } } /** * Find out the bean class name */ private static String beanName(Object bean) { String fullClassName = bean.getClass().getName(); String classNameTemp = fullClassName.substring( fullClassName.lastIndexOf(".") + 1, fullClassName.length() ); return classNameTemp.substring(0, 1) + classNameTemp.substring(1); } }

    The BeanXMLMapping class converts a JavaBean to and from an XML document and provides two methods:

  • toXML(): generates the respective XML document String for the bean instance
  • fromXML(): creates a bean instance for the XML document String
  • Use the component

    Listing 2 shows AccountHistoryContext, a bean class empowered with toXML() and fromXML() capabilities. The JavaBean class simply delegates its toXML() and fromXML() methods to the BeanXMLMapping component.

    Listing 2. AccountHistoryContext bean

    public class AccountHistoryContext{ private String dateFrom; public String getDateFrom() { return dateFrom; } public void setDateFrom(String s) { dateFrom = s; } ... // Other attributes with their get and set methods public String toXML() { return BeanXMLMapping.toXML(this); } public static AccountHistoryContext fromXML (String xml) { return (AccountHistoryContext) BeanXMLMapping.fromXML ( xml, AccountHistoryContext.class); } }

    Figure 1 represents the mapping between a generic JavaBean class and its respective generic XML document.

    Figure 1. JavaBean-XML document mapping. Click on thumbnail to view full-size image. JavaBean to XML

    The XML document's first line is the XML declaration, which defines the document's XML version. In this case, the document conforms to XML Specification 1.0 (<?xml version="1.0" encoding="ISO-8859-1"?>).

    The next line defines the document's first element (the root element). This is the JavaBean name (<Bean>).

    The next lines define the root's (JavaBean's) child elements. These are the bean attributes available through get methods. If the attribute is a basic type (e.g., String, int), a node with the attribute name is generated. If a bean has a get method for a nested bean, nested child elements are generated.

    Figure 2 shows a ContactInfo bean object, its class, and the XML document generated by the toXML() method invocation.

    Figure 2. toXML() method invocation XML to JavaBean

    When reading the XML document, a mapping between the root node name, attributes, and nested nodes will be made for the bean, set methods, and nested beans, respectively. Empty constructors for each bean and set methods for each attribute (basic type or nested bean) must be provided to accomplish the proper mapping.

    Figure 3 shows a ContactInfo XML document, a matching ContactInfo bean class, and the bean object resulting from the fromXML() method invocation.

    Figure 3. fromXML() method invocation Usage example

    Let's examine an example of BeanXMLMapping usage. The sample consists of XML, JavaBean classes, and snapshots of an online banking application. You can download the example source code from Resources.

    Figure 4 is a sample account history page in an online banking application.

    Figure 4. Sample account history page

    Figure 5 displays the AccountHistory bean class diagram, while Listing 3 shows an XML document generated through its toXML() method invocation.

    Figure 5. AccountHistory bean class diagram. Click on thumbnail to view full-size image.

    Listing 3. Account history XML representation

    <?xml version="1.0" encoding="ISO-8859-1"?> <AccountHistory> <transactionList> <transaction> <deposit></deposit> <withdraw>-,150.00 </withdraw> <date>3/10/2002 </date> <description>Check Number: 213 </description> <balance>,340.50</balance> </transaction> <transaction> <deposit></deposit> <withdraw>-51.50</withdraw> <date>3/7/2002</date> <description>ATM Withdrawal 350 SAN JOSE CA</description> <balance>,189.00</balance> </transaction> <transaction> <deposit>,060.40 </deposit> <withdraw></withdraw> <date>3/5/2002</date> <description>ACH DEPOSIT - MyCompany </description> <balance>,249.40</balance> </transaction> <transaction> <deposit></deposit> <withdraw>-0.00</withdraw> <date>2/26/2002</date> <description>JC'S BBQ AND DELI SAN JOSE CA </description> <balance>,229.40</balance> </transaction> </transactionList> <accountHistoryContext> <account> <holder>Paulo Caroli</holder> <type>checkings</type> <number>316614-10</number> </account> <dateTo>Monday, March 11, 2002 </dateTo> <dateFrom>Monday, February 25, 2002 </dateFrom> </accountHistoryContext> </AccountHistory>

    Figure 6's sequence diagram shows a possible scenario where an AccountHistory bean object is reached and its toXML() method invoked.

    Figure 6. Simplified sequence diagram for getting AccountHistory XML document. Click on thumbnail to view full-size image.

    Figure 7 is a sample page for requesting account history in an online banking application. The bank account and dates are retrieved and displayed on this page; Listing 4 shows how such information can be represented as XML.

    Figure 7. Sample page for requesting account history in an online banking application

    Listing 4. Account history context XML representation

    <?xml version="1.0" encoding="ISO-8859-1"?> <AccountHistoryContext> <account> <holder>Paulo Caroli</holder> <type>checkings</type> <number>316614-10</number> </account> <dateTo>Monday, March 11, 2002 </dateTo> <dateFrom>Monday, February 25, 2002 </dateFrom> </AccountHistoryContext>

    AccountHistoryContext.FromXML() is invoked to retrieve the AccountHistoryContext bean object for the respective XML document.

    Keep it simple!

    Fortunately, it is this simple. Conversion from JavaBean to XML and vice versa happens smoothly, without requiring much from the JavaBean code. Developers can benefit from the use of the BeanXMLMapping component and code at a high level without dealing with any XML-specific library.

    There's no need for complexity to accomplish JavaBean-XML mapping. Take advantage of the BeanXMLMapping component and enjoy your XML-empowered beans.

    Paulo Caroli is a project manager at Omni Pros. Paulo has a master's degree in software engineering and is a Sun Certified Architect for Java Technology with more than nine years of experience in application development. He is an expert in object-oriented techniques who specializes in Java 2 Platform, Enterprise Edition (J2EE) Web application development. Learn more about this topic
  • Download the source code for this tiphttp://images.techhive.com/downloads/idge/imported/article/jvw/2003/05/jw-javatip138.zip
  • JOX (Java Objects in XML)http://www.wutka.com/jox.html
  • JOX downloadhttp://www.wutka.com/joxdownload.html
  • DTDParser downloadhttp://www.wutka.com/dtdparserdownload.html
  • Xerces-J downloadhttp://xml.apache.org/dist/xerces-j/Xerces-J-bin.1.4.4.zip
  • The World Wide Web Consortium's XML resource pagehttp://www.w3.org/XML
  • "XML and JavaThe Perfect PairPart 1," Ken Sall (Internet.com, November 1998)http://wdvl.com/Authoring/Languages/XML/Java/index.html
  • The Unified Modeling Language User Guide, Grady Booch, Ivar Jacobson, James Rumbaugh, Jim Rumbaugh (Addison-Wesley, 1998; ISBN0201571684)http://www.amazon.com/exec/obidos/ASIN/0201571684/javaworld
  • "XML for the Absolute Beginner," Mark Johnson (JavaWorld, April 1999)http://www.javaworld.com/javaworld/jw-04-1999/jw-04-xml.html
  • Complete listing of Mark Johnson's archived JavaBeans columns in JavaWorldhttp://www.javaworld.com/columns/jw-javabeans-index.shtml
  • See the JavaBeans section of JavaWorld's Topical Indexhttp://www.javaworld.com/javaworld/topicalindex/jw-ti-jbeans.html
  • Find more XML-related articles in the Java and XML section of JavaWorld's Topical Indexhttp://www.javaworld.com/channel_content/jw-xml-index.shtml
  • For more insightful Java tips, visit JavaWorld's Java Tips index pagehttp://www.javaworld.com/columns/jw-tips-index.shtml
  • See the Java Q&A index page for the full Q&A cataloghttp://www.javaworld.com/columns/jw-qna-index.shtml
  • Get more of your questions answered in our Java Beginner discussionhttp://forums.devworld.com/webx?50@@.ee6b804
  • Sign up for JavaWorld's free weekly email newslettershttp://www.javaworld.com/subscribe

  • Using The Digester Component | killexams.com real questions and Pass4sure dumps

    The emergence of Extensible Markup Language (XML) has led to a complete transformation of the application development world. All development seems to revolve around XML these days. In fact, it is difficult to find any new development that does not directly or indirectly rely on XML. For instance, Web services are unimaginable without XML, and with the usage of Web services projected to boom over the next few years, there is no escaping XML. In this article, you will look at the Jakarta Commons Digester component and how it can make working with XML a simple task.

    Table 7-1 shows the component details.

    Table 7-1. Component Details

    Name Version Package Digester 1.5 org.apache.commons.digester

    One problem that has plagued XML development is the complexity of parsing and using XML. Everybody knows the advantages of using XML, but I doubt many people are able to write a piece of code that parses an XML file and picks up the value of a certain XML tag. Writing a piece of Java code to parse a piece of XML directly using the two core Application Programming Interfaces (APIs)—the Document Object Model (DOM) and Simple API for XML (SAX)—is anything but simple. APIs such as JDOM are relatively simple, but considering how often you have to encounter and tackle XML, Digester provides an easier option. You can be parsing and using XML in your Java code in less than the time it will take you to read this article. (No, I will not eat my hat if you do not manage to accomplish the task.)

    To quickly get up and running with Digester, you will see an example first. Do not worry about the syntax because you will look at that in detail later in this article. The scenario for this example is that you are presented with an XML file containing the details of all the students attending the various courses at your training institute. What you are expected to do is to pick up all the details present in the XML file, and for each student detail, populate an instance of a class Student, which you create. You will then store all the Student instances created in an instance of the java.util.Vector class for further processing.

    You first need to create a Student class that will hold the details of a student (see Listing 7-1).

    Listing 7-1. Student Class

    package com.commonsbook.chap7; public class Student { private String name; private String course; public Student() { } public String getName() { return name; } public void setName(String newName) { name = newName; } public String getCourse() { return course; } public void setCourse(String newCourse) { course = newCourse; } public String toString() { return("Name="+this.name + " & Course=" + this.course); } }

    Apart from the overridden toString method, there is nothing special about this class. It has just two properties with getter and setter methods for each. You want to create instances of this class based on the data you retrieve from an XML file.

    Listing 7-2 shows the XML file contents. The number of student tags is not relevant; you could very well introduce more students if you like.

    Listing 7-2. students.xml

    <?xml version="1.0"?> <students> <student> <name>Java Boy</name> <course>JSP</course> </student> <student> <name>Java Girl</name> <course>EJB</course> </student> </students>

    NOTE In Listings 7-1 and 7-2 you can see that the names of the tags and properties match exactly. So, for a tag course, you have a property named course in the Student class. However, you can have different tag names and property names. No mapping of the XML and the Java class is required; you could very well store the value of a tag ABC into a property XYZ. The matching names merely keep things simple.

    The Java class DigestStudents, shown in Listing 7-3, will pick up the contents of the various XML tags and create a Vector class instance that can hold many instances of the class Student.

    Listing 7-3. DigestStudents

    package com.commonsbook.chap7; import java.util.Vector; import org.apache.commons.digester.Digester; public class DigestStudents { Vector students; public DigestStudents() { students= new Vector(); } public static void main(String[] args) { DigestStudents digestStudents = new DigestStudents(); digestStudents.digest(); } private void digest() { try { Digester digester = new Digester(); //Push the current object onto the stack digester.push(this); //Creates a new instance of the Student class digester.addObjectCreate( "students/student", Student.class ); //Uses setName method of the Student instance //Uses tag name as the property name digester.addBeanPropertySetter( "students/student/name"); //Uses setCourse method of the Student instance //Explicitly specify property name as 'course' digester.addBeanPropertySetter( "students/student/course", "course" ); //Move to next student digester.addSetNext( "students/student", "addStudent" ); DigestStudents ds = (DigestStudents) digester.parse(this.getClass() .getClassLoader() .getResourceAsStream("students.xml")); //Print the contents of the Vector System.out.println("Students Vector "+ds.students); } catch (Exception ex) { ex.printStackTrace(); } } public void addStudent( Student stud ) { //Add a new Student instance to the Vector students.add( stud ); } }

    In very few lines of code you have managed to create the Vector of Student instances. The output of the program is as follows, displaying the tag values in the file students.xml:

    Students Vector [Name=Java Boy Course=JSP, Name=Java Girl Course=EJB]

    Pretty cool, eh? I would have loved to write the corresponding DOM and SAX code to compare and illustrate the advantage of using the Digester component, but writing DOM and SAX code is something I forgot a long time ago and am not very keen on learning again. So you will just continue with the Digester experiments. Specifically, you will next look at some Digester fundamentals and learn how the example in Listing 7-3 works.

    Understanding Digester Concepts

    The Digester component has its origins in the Struts framework project. It began its life as a tool to quickly parse the struts-config.xml file without having to directly interact with SAX. Because the Digester functionality can be useful to all kinds of applications, it later moved to the Commons project.

    The Digester is not an XML parser but just a high-level interface that uses SAX underneath to accomplish the actual XML parsing. So a requirement for Digester is the presence of an XML parser conforming to Java API for XML Processing (JAXP) version 1.1 or later. The Digester also depends on the following Commons components:

  • The BeanUtils component
  • * The Collections component
  • * The Logging component
  • Because Digester uses SAX to do the parsing, XML processing with Digester happens in an event-driven manner. An event-driven manner is when events are triggered while the document is being parsed; what you need to do is provide handlers for these events. That is the way SAX works. SAX is all about events being fired when a certain occurrence is found. SAX events are fired on occurrences such as starting tags, ending tags, and so on. DOM works a little differently: Object models are created in memory and parsed. However, when using the Digester, you do not need to understand how SAX or DOM works, and you do not need to do any SAX-specific tasks in your code. Just stick to Digester’s rules, and you should soon be parsing XML documents with ease.

    Digester uses a stack to store or retrieve objects as the XML file is being parsed. If you are not familiar with what a stack is, just think of it as a box in which you keep putting items and can remove them only on the basis of Last In First Out (LIFO). Java provides a stack implementation with java.util.Stack.

    Based on the rules defined and the XML encountered, the Digester component pushes objects on the stack. Upon encountering the start of a tag, the associated object is pushed onto the stack, and it is popped only after all the nested contents of that tag are processed. So, in Listing 7-3 upon the student tag being encountered, an instance of Student class will be pushed onto the stack and will be popped once the processing of its child tags name and course is complete.

    Using Matching Patterns

    The big advantage of using the Digester component instead of other APIs is the presence of element matching patterns. Unlike other APIs where you have to worry about parent/child relationships among tags, what is important with Digester is the matching pattern specified. For example, in Listing 7-3, you used the matching patterns students/student, students/student/name, and students/student/course. This is an easy and developer-friendly usage to precisely convey the tag to which you want to refer. If you have to map the tags in Listing 7-2 to the corresponding matching pattern, the mapping will be as shown in Table 7-2.

    Table 7-2. Tag Pattern Mapping

    Tag Pattern <students> students <students> students/students <name> students/students/name <course> students/students/course

    You can also use the wildcard * if you want to have a more generalized matching. So the pattern */name would have matched all name tags within the document.

    Using Rules

    With element matching patterns you convey the exact location of the tag in the XML structure. However, to tell the Digester component what needs to be done upon finding that tag, you need to define processing rules. These rules fire when the matching pattern is found. All rules are expected to extend the abstract class org.apache.commons.digester.Rule and define specific actions that need to be taken when a certain element occurs.

    You can define your own rules to handle application-specific cases. The Digester component comes with a set of rule implementations that extend the Rule class; you can find them in the package org.apache.commons.digester. As you move along, you will see some of these rules in the examples. In Listing 7-3 you used ObjectCreateRule to create an instance of the Student class, and you used BeanPropertySetterRule to set the properties of the class.

    Before getting into a more complex XML example than the one you saw in Listing 7-2, you will look at the steps you need to perform for Digester to successfully retrieve data from XML:

  • You need to create a new instance of org.apache.commons.digester.Digester and configure it using the various setXxx methods provided by the class. Among other properties, you can define whether the XML should be validated, define the logger to be used, and define the Rules implementation object.
  • You push any initial objects on the object stack using the Digester’s push method before you define the patterns and the rules to be used. In Listing 7-3, you pushed the current object on the stack using the keyword this. The reason you need to push this initial object is because Digester keeps pushing and popping objects from the stack as it encounters tags. So the first object is created and pushed onto the stack upon encountering the first tag, and this object is popped off the stack when the last tag is processed. Because you need to hold a reference to the object for the first tag, the initial object you push before you parse the XML serves the purpose and retains a reference to that object.
  • Register element matching patterns and the rules you want to be fired for each case. In Listing 7-3 you register three patterns and two rules that you want to be fired.
  • Finally, you parse the XML file using the parse method of the Digester instance you created.

    NOTE The order in which you do things is important for Digester. You cannot randomly move around statements before the call to the parse method. For example, in Listing 7-3, you cannot move the call to addObjectCreate to after the call to addSetNext.

  • You will now look at a more complex XML example and try to process it using Digester. You will also see how you can move the specifying of Digester patterns and rules from code to a configuration XML file.

    Following XML Rules

    In Listing 7-3, most of the code is dedicated to configuring the Digester instance. Hardly any of the code can be termed as action-oriented code. The most common usage of Digester is to process XML-based configuration files. The reason why these configuration files are used is to keep code free of configuration information and make changes possible without having to change the code and recompile it. It would be unfair if you placed Digester configuration information within Java code. Even this bit has to move to a configuration XML file.

    The package org.apache.commons.digester.xmlrules deals with this issue, and the DigesterLoader class that is present in this package makes it possible to create a Digester instance using just the information in an XML file.

    In the following example, you will first look at Java code that will accomplish the task along somewhat similar lines as the example in Listing 7-3 and then move to an XML-based configuration file for the same example.

    Listing 7-4 shows the XML file from which you want to fetch information. The XML stores information about an academy, its students, and its teachers. The Digester code picks up these details and makes them manageable within Java code

    Listing 7-4. academy.xml

    <?xml version="1.0"?> <academy name="JAcademy" > <student name="JavaBoy" division="A"> <course> <id>C1</id> <name>JSP</name> </course> <course> <id>C2</id> <name>Servlets</name> </course> </student> <student name="JavaGirl" division="B"> <course> <id>C3</id> <name>EJB</name> </course> </student> <teacher name="JavaGuru"> <certification>SCJP</certification> <certification>SCWCD</certification> </teacher> <teacher name="JavaMaster"> <certification>OCP</certification> <certification>SCJP</certification> <certification>SCEA</certification> </teacher> </academy>

    NOTE With Listing 7-4 I have tried to address the many scenarios you might encounter when parsing XML files. Using this code from this example can get you started in no time.

    Because you have to hold the XML data in Java objects, you need to decide which classes you have to create. Instances of these classes will hold the data for you. Looking at this example, you should see four classes that together can do a good job of holding the data in a properly structured format. These classes are Academy, Student, Course, and Teacher. You could very well create more classes, such as Certification. The most important thing is that you cannot have these as just separate classes; you also need to maintain the relationships among them as depicted in the XML file. So, you will first put down the Java classes. Instances of the Java classes will hold the data for you.

    An instance of the Course class is meant to store just the name and the ID of the course. The Course instance will not be maintaining its relation to the Student; this will be done by the Student instance. Listing 7-5 shows the Course class; it has two properties and the corresponding get and set methods. Note that the package name for classes used in this example is com.commonsbook.chap7.academy.

    Listing 7-5. Course Class

    package com.commonsbook.chap7.academy; import org.apache.commons.beanutils.PropertyUtils; import java.util.Vector; public class Course { private String id; private String name; public Course() { } public String getId() { return id; } public void setId(String newId) { id = newId; } public String getName() { return name; } public void setName(String newName) { name = newName; } public String toString() { StringBuffer buf = new StringBuffer(60); buf.append("ntCourseId>>> " + this.getId() + "t"); buf.append("CourseName>>> " + this.getName()); return buf.toString(); } }

    Next you will define the Student class that not only has to hold information about the student but also about the courses the student attends. As shown in Listing 7-6, the student details are stored using properties, and the courses will be stored as a Vector of Course instances.

    Listing 7-6. Student Class

    package com.commonsbook.chap7.academy; import java.util.Vector; public class Student { private Vector courses; private String name; private String division; public Student() { courses = new Vector(); } public void addCourse(Course course) { courses.addElement(course); } public String getName() { return name; } public void setName(String newName) { name = newName; } public String getDivision() { return division; } public void setDivision(String newDivision) { division = newDivision; } public void setCourses(Vector courses) { this.courses = courses; } public Vector getCourses() { return courses; } public String toString() { StringBuffer buf = new StringBuffer(60); buf.append("nStudent name>> " + this.getName()); Vector courses = this.getCourses(); //Iterate through vector. Append content to StringBuffer. for (int i = 0; i < courses.size(); i++) { buf.append(courses.get(i)); } return buf.toString(); } }

    Listing 7-4 shows that, for a teacher, you are expected to store the name and the list of certifications held by the teacher. The Teacher class, shown in Listing 7-7, does this by using a String property for the name and a Vector holding String instances for the certifications list.

    Listing 7-7. Teacher Class

    package com.commonsbook.chap7.academy; import org.apache.commons.beanutils.PropertyUtils; import java.util.Vector; public class Teacher { private String name; private Vector certifications; public Teacher() { certifications = new Vector(); } public void addCertification(String certification) { certifications.addElement(certification); } public String getName() { return name; } public void setName(String newName) { name = newName; } public void setCertifications(Vector certifications) { this.certifications = certifications; } public Vector getCertifications() { return certifications; } public String toString() { StringBuffer buf = new StringBuffer(60); buf.append("nTeacher name>> " + this.getName()); Vector certs = this.getCertifications(); //Iterate through vector. Append content to StringBuffer. for (int i = 0; i < certs.size(); i++) { buf.append("ntCertification>> " + certs.get(i)); } return buf.toString(); } }

    The academy tag is the root tag shown in Listing 7-4. So the Academy class not only has to store the name of the academy but also references to the data held by the child tags of the academy tag. Therefore, the Academy class, shown in Listing 7-8, has two Vectors, one that will store instances of Student classes and another that will store instances of Teacher classes. So directly or indirectly you should be able to access all the data depicted in Listing 7-4 using a reference to a properly populated Academy class instance. The overridden toString method will be used later in the article to print the data held by an Academy instance.

    Listing 7-8. Academy Class

    package com.commonsbook.chap7.academy; import org.apache.commons.beanutils.PropertyUtils; import java.util.Vector; public class Academy { private Vector students; private Vector teachers; private String name; public Academy() { students = new Vector(); teachers = new Vector(); } public void addStudent(Student student) { students.addElement(student); } public void addTeacher(Teacher teacher) { teachers.addElement(teacher); } public Vector getStudents() { return students; } public void setStudents(Vector newStudents) { students = newStudents; } public Vector getTeachers() { return teachers; } public void setTeachers(Vector newTeachers) { teachers = newTeachers; } public String getName() { return name; } public void setName(String newName) { name = newName; } public String toString() { StringBuffer buf = new StringBuffer(60); buf.append("Academy name>> " + this.getName()); Vector stud = this.getStudents(); Vector teach = this.getTeachers(); buf.append("nn**STUDENTS**"); //Iterate through vectors. Append content to StringBuffer. for (int i = 0; i < stud.size(); i++) { buf.append(stud.get(i)); } buf.append("nn**TEACHERS**"); for (int i = 0; i < teach.size(); i++) { buf.append(teach.get(i)); } return buf.toString(); } }

    Now that you are done with the classes that will store the data for you, you will move to the Digester code that will actually parse the XML. You will first see how you specify Digester instructions within the Java code. Next you will move out these instructions to an easily configurable XML file, making your Java code short and simple. Listing 7-9 shows the Java code to specify Digester rules and parse the XML accordingly. The thing to note in this piece of code is the usage of the following rules:

  • ObjectCreate: This rule creates a new instance of the classes Academy, Student, Teacher, and Course on a matching pattern being found.
  • SetProperties: The SetProperties rule sets the properties of the class using the attribute values. Because the name of the attribute and the property in the class matches exactly, you did not specify those details; however, if the attribute names in XML and property names in Java differ, you have to specify that mapping.
  • BeanPropertySetter: This rule sets the properties of the bean using the values of the child tags. For example, the id and name properties of the instance of the class Course are set using this rule.
  • SetNext: The SetNext rule moves to the next course, student, and teacher tags. You have also specified the method to call in each case.
  • CallMethod: The CallMethod rule specifies the method to be called upon a certain pattern being found. You also specify the number of parameters that this method expects.
  • CallParam: The CallParam rule specifies the parameter value to be passed to the method call defined using the CallMethod rule.
  • Listing 7-9. DigestJavaAcademy Class (Digester Rules Defined in Java Code)

    package com.commonsbook.chap7.academy; import org.apache.commons.beanutils.PropertyUtils; import org.apache.commons.digester.Digester; import java.util.Vector; public class DigestJavaAcademy { public static void main(String[] args) throws Exception { DigestJavaAcademy d = new DigestJavaAcademy(); d.digest(); } public void digest() throws Exception { Digester digester = new Digester(); digester.addObjectCreate("academy", Academy.class); //Set the attribute values as properties digester.addSetProperties("academy"); //A new Student instance for the student tag digester.addObjectCreate("academy/student", Student.class); //Set the attribute values as properties digester.addSetProperties("academy/student"); //A new Course instance digester.addObjectCreate("academy/student/course", Course.class); //Set properties of the Course instance with values of two child tags digester.addBeanPropertySetter("academy/student/course/id", "id"); digester.addBeanPropertySetter("academy/student/course/name", "name"); //Next Course digester.addSetNext("academy/student/course", "addCourse"); //Next student digester.addSetNext("academy/student", "addStudent"); //A new instance of Teacher digester.addObjectCreate("academy/teacher", Teacher.class); ///Set teacher name with attribute value digester.addSetProperties("academy/teacher"); //Call Method addCertification that takes a single parameter digester.addCallMethod("academy/teacher/certification", "addCertification", 1); //Set value of the parameter for the addCertification method digester.addCallParam("academy/teacher/certification", 0); //Next Teacher digester.addSetNext("academy/teacher", "addTeacher"); //Parse the XML file to get an Academy instance Academy a = (Academy) digester.parse(this.getClass().getClassLoader() .getResourceAsStream("academy.xml")); System.out.println(a); } }

    The order in which you define rules is important. You have just represented what was obvious to you in the XML in a form that Digester can understand.

    To execute this piece of code, you need to have the academy.xml file present in the CLASSPATH. Listing 7-10 shows the output upon executing this piece of code.

    Listing 7-10. Output Upon Executing the Code in Listing 7-9

    Academy name>> JAcademy **STUDENTS** Student name>> JavaBoy CourseId>>> C1 CourseName>>> JSP CourseId>>> C2 CourseName>>> Servlets Student name>> JavaGirl CourseId>>> C3 CourseName>>> EJB **TEACHERS** Teacher name>> JavaGuru Certification>> SCJP Certification>> SCWCD Teacher name>> JavaMaster Certification>> OCP Certification>> SCJP Certification>> SCEA

    Looking at Listing 7-9, it is obvious that almost all the code is dedicated to configuring the Digester. Did they not teach us in school that wherever possible move all configurable items to a file that can be easily managed and manipulated? So why not do that in this case?

    The org.apache.commons.digester.xmlrules package provides for an XML-based definition of Digester rules. Defining Digester rules in XML is quite simple once you get the hang of the various rules and what they do for you. Considering the more widespread nature of XML, your Digester rules are now more easily understandable to a wide variety of people involved. Even your manager might understand a thing or two!

    Listing 7-11 shows the rules you defined using Java in Listing 7-9 but using XML instead.

    Listing 7-11. academyRules.xml Digester Rules Defined in XML

    <?xml version="1.0"?> <digester-rules> <pattern value="academy"> <object-create-rule classname="com.commonsbook.chap7.academy.Academy" /> <set-properties-rule /> <pattern value="student"> <object-create-rule classname="com.commonsbook.chap7.academy.Student" /> <set-properties-rule /> <pattern value="course"> <object-create-rule classname="com.commonsbook.chap7.academy.Course" /> <bean-property-setter-rule pattern="id"/> <bean-property-setter-rule pattern="name"/> <set-next-rule methodname="addCourse" /> </pattern> <set-next-rule methodname="addStudent" /> </pattern> <pattern value="teacher"> <object-create-rule classname="com.commonsbook.chap7.academy.Teacher" /> <set-properties-rule /> <call-method-rule pattern="certification" methodname="addCertification" paramcount="1" /> <call-param-rule pattern="certification" paramnumber="0"/> <set-next-rule methodname="addTeacher" /> </pattern> </pattern> </digester-rules>

    In the XML in Listing 7-11, the rules defined in XML almost directly map to the methods defined in the Java in Listing 7-9. All the rules now are defined using tags of that name. The easiest way to check the usage of these tags is to open the digester-rules.dtd file. You can easily find this file in the source download of the Digester component. However, even with the binary download, this file can be extracted out of commons-digester.jar file and is present in the org.apache.commons.digester.xmlrules package. You can also look at the file and Digester code using ViewCVS at http://jakarta.apache.org/site/cvsindex.html.

    Document Type Definition (DTD) files define the syntax and structure of XML files, and although they take some getting used to, understanding them is not difficult.

    Once you are done defining the rules in XML, the Java bit left is simple. Listing 7-12 shows the Java code where you just define the rules file to be used to create a Digester instance and then parse the XML file using that Digester instance.

    Listing 7-12. DigestXMLJavaAcademy Class (Java Code Using Rules Defined in XML)

    package com.commonsbook.chap7.academy; import java.io.File; import java.util.Vector; import org.apache.commons.beanutils.PropertyUtils; import org.apache.commons.digester.Digester; import org.apache.commons.digester.xmlrules.DigesterLoader; public class DigestXMLJavaAcademy { public static void main( String[] args ) { DigestXMLJavaAcademy xmlDigest= new DigestXMLJavaAcademy(); xmlDigest.digest(); } public void digest(){ try { //Create Digester using rules defined in academyRules.xml Digester digester = DigesterLoader.createDigester( this.getClass().getClassLoader().getResource("academyRules.xml")); //Parse academy.xml using the Digester to get an instance of Academy Academy a = (Academy)digester.parse( this.getClass().getClassLoader().getResourceAsStream("academy.xml")); Vector vStud=a.getStudents(); Vector vTeach=a.getTeachers(); for (int i = 0; i < vStud.size(); i++) { System.out.println("Student>> "+PropertyUtils.describe(vStud.get(i))); } for (int i = 0; i < vTeach.size(); i++) { System.out.println("Teacher>> "+ PropertyUtils.describe(vTeach.get(i))); } } catch( Exception e ) { e.printStackTrace(); } } }

    The two files academy.xml and academyRules.xml have to be present in the CLASSPATH, and upon execution of the code, you get the same output as shown in Listing 7-10 that you got using the Java code in Listing 7-9.

    Introducing Other Digester Features

    Apart from these Digester features, I will mention some other features of Digester:

  • The Logging capability of Digester can be useful while troubleshooting. Digester uses the Commons Logging component and the Digester class even provides a setLogger method with which you can define the exact logger to be used.
  • The org.apache.commons.digester.rss package provides an example usage of Digester to parse XML in the Rich Site Summary (RSS) format, which is widely used by news sites to provide news feeds. Most of the popular content providers support RSS, and you can find more information about RSS at http://blogs.law.harvard.edu/tech/rss/.
  • You can configure Digester to validate XML using a DTD file. You should register the DTD using the register method, and you can switch on validation using the setValidating method of the Digester class.
  • You can configure Digester to match patterns based on namespaces. You use the methods setNamespaceAware and setRuleNamespaceURI so that the Digester does not confuse a name tag in a namespace X with a similar name tag in a namespace Y.
  • Summary

    In this article, you looked at the Digester component, which drastically cuts down on the complexity involved in parsing XML. You saw how Digester works on the simple concept of element matching patterns and how you can define rules in Java code as well as in a separate XML file. You also saw some examples that reflected common XML parsing requirements.

    Using Digester and defining the rules in a separate XML file gets a big thumbs-up from me. I highly recommend Digester for all your XML parsing requirements.

    About the Author

    Harshad wrote the books Pro Jakarta Commons (Apress, 2004), Oracle JDeveloper 10g: Empowering J2EE Development (Apress, 2004) and also coauthored Java 2 Enterprise Edition 1.4 Bible (Wiley & Sons, 2003).

    Harshad Oak has a master's degree in computer management and is a Sun Certified Java Programmer and a Sun Certified Web Component Developer. He is the founder of Rightrix Solutions (http://www.rightrix.com) that is primarily involved in software development and content management services. Harshad has earlier been part of several J2EE projects at i-flex Solutions and Cognizant Technology Solutions.

    Furthermore, he has written several articles about Java/J2EE for CNET Builder.com (http://www.builder.com/). He is also a guest lecturer on Java and J2EE. He can be reached at harshad@rightrix.com

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