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© Visual Patterns, Inc. Agile Java Development With Spring, Hibernate and Eclipse Anil Hemrajani

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1 © Visual Patterns, Inc. Agile Java Development With Spring, Hibernate and Eclipse Anil Hemrajani

2 © Visual Patterns, Inc. 2 About This Presentation Not a tutorial on any one technology! Overview of each technology (use website, books, etc. for details) Downloadable code (working application) Latest buzz in the US, Europe, etc. End-to-end system! Requirements Architecture/design Java development and debugging Deployment Logging/monitoring Advanced considerations Content/format (text, graphs, code, comics)

3 © Visual Patterns, Inc. 3 Material In This Presentation Taken Directly From My Book Agile Java Development With Spring, Hibernate and Eclipse Forewords by Scott W. Ambler and Rod Johnson 1. Introduction to Agile Java Development 2. The Sample Application: An Online Timesheet System 3. XP and AMDD-Based Architecture and Design Modeling 4. Environment Setup: JDK, Ant, and JUnit 5. Using Hibernate For Persistent Objects 6. Overview of the Spring Framework 7. The Spring Web MVC Framework 8. The Eclipse Phenomenon 9. Logging, Debugging, Monitoring and Profiling 10. Beyond the Basics 11. What Next? 12. Parting Thoughts Appendices (with lots of goodies) available on amazon.com

4 © Visual Patterns, Inc. 4 My Background (details at VisualPatterns.com) 20 years of experience in the IT Working with Java Technology since late 1995 as a developer, entrepreneur, author, and trainer. Helped several Fortune 100 companies (some smaller organizations) Published a book and 30 articles Presented at conferences and seminars around the world Awards:  "Outstanding Contribution to the Growth of the Java Community"  "Best Java Client" for BackOnline (a Java-based online backup product)  nominated for a Computerworld-Smithsonian award by Scott McNealy Founder of: Isavix Corporation – successful IT solutions company (now Inscope Solutions) DeveloperHub.com (formerly isavix.net) - award-winning online developer community (grew to over 100,000 registered members) At present – VisualPatterns.com and AgileDraw.org

5 © Visual Patterns, Inc. 5 Practical Stuff, Not Fluff! Recently completed project for U.S. Fortune 50 company Application Financial application process billions of $ every week Clustered application (99.9% uptime required) Used most the technologies covered in presentation (spring, hibernate, eclipse, ant, JUnit…)

6 © Visual Patterns, Inc. 6 Agenda 1. Introduction to Agile Java Development 2. Agile Processes 3. Agile Modeling 4. Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects (Short Break) The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling 5. Beyond The Basics

7 © Visual Patterns, Inc. Introduction to Agile Java Development Assume simplicity. Travel light. - Agile Modeling principles: agilemodeling.com Assume simplicity. Travel light. - Agile Modeling principles: agilemodeling.com

8 © Visual Patterns, Inc. 8 What Is Agile Java Development? It Could Include… 1. Agile Software Lifecycle Processes (e.g. Scrum, XP, TDD) 2. Agile Architecture/Design Modeling Incremental (just-in-time) design “Good enough” diagrams Agile Model Driven Development (AMDD) 3. Agile Java Design/Development Simple design and coding! Test-driven development (TDD) Efficient frameworks and tools (Ant, JUnit, Hibernate, Spring, Eclipse…) Plain Old Java Objects (POJOs), whenever possible

9 © Visual Patterns, Inc. 9 Sample (Time Sheet) Application Used In This Presentation Downloadable code: visualpatterns.com/resources.jsp

10 © Visual Patterns, Inc. Agile Processes Requirements change. Design evolves. Documents are seldom current. Requirements change. Design evolves. Documents are seldom current.

11 © Visual Patterns, Inc. Some Stats by The Standish Group (standishgroup.com)

12 © Visual Patterns, Inc. 12 The Solution CHAOS Ten – Success Factors source: standishgroup.com In 2001, seventeen methodologists came together to unify their methodologies under one umbrella; they jointly defined the term, Agile! Read story at: martinfowler.com/articles/agileStory.html In 2001, seventeen methodologists came together to unify their methodologies under one umbrella; they jointly defined the term, Agile! Read story at: martinfowler.com/articles/agileStory.html

13 © Visual Patterns, Inc. 13 AgileManifesto.org

14 © Visual Patterns, Inc. 14 What Does “Agile” Exactly Mean? The Term Agile incorporates a wide range of methods, for example: AM - Agile Modeling ASD - Adaptive Software Development AUP - Agile Unified Process Crystal FDD - Feature Driven Development DSDM - Dynamic Systems Development Method Lean Software Development Scrum Xbreed XP - eXtreme Programming

15 © Visual Patterns, Inc. Agility - All About Smaller Chunks (Shorter/Frequent Cycles)... Iteration 0 Iteration 1 Iteration n Release 1... Release 2 Iteration 0 Iteration 1 Iteration n... software Incrementally Build Software - Highest Priority Features First!

16 © Visual Patterns, Inc. 16 Agile Method: Scrum Simple process for product/project management Product Backlog - List of known features/changes for product Sprint - 1-month iterations (develop highest priority items) Meetings Sprint Planning Meeting – Done at beginning of each sprint (after planning, features moved from product backlog to sprint backlog) Daily scrum meeting (short: 15 minutes) Sprint review meeting

17 © Visual Patterns, Inc. 17 Extreme Programming (XP) Shorter and Frequent Cycles (smaller chunks!) Release - Quarterly Cycles (set a theme) Iteration - Weekly Cycles (e.g. aim for last day of week) 10-minute builds Continuous integration (multiple times per day; manual or automatic) Incremental Design and Planning (defer investment till needed) Development in small increments using Test-First development Communications - Sit Together, Informative Workspace, on- site customer Flow - sustainable pace versus rigid phases; velocity, continuous integration Others… visit extremeprogramming.org

18 © Visual Patterns, Inc. 18 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

19 © Visual Patterns, Inc. Agile Modeling “...your goal is to build a shared understanding, it isn’t to write detailed documentation.” - Scott W. Ambler “...your goal is to build a shared understanding, it isn’t to write detailed documentation.” - Scott W. Ambler

20 © Visual Patterns, Inc. 20 Quick Poll Have you ever been on a project where documentation was kept up-to-date through end of project?

21 © Visual Patterns, Inc. 21 Agile Model Driven Development (AMDD) Subset of Agile Modeling (agilemodeling.com) Agile version of Model Driven Development (MDD) Instead of extensive models, “barely good enough” Initial modeling activity 1. Requirements 2. Architecture Requirements modeling Usage models Domain models UI models Architecture modeling Free-form diagrams Change cases

22 © Visual Patterns, Inc. 22 Project Initiation

23 © Visual Patterns, Inc. 23 Problem Statement Our employees currently submit their weekly hours worked using a paper-based timesheet system that is manually intensive and error- prone. We require an automated solution for submitting employee hours worked, in the form of an electronic timesheet, approving them, and paying for the time worked. In addition, we would like to have automatic notifications of timesheet status changes and a weekly reminder to submit and approve employee timesheets. Our employees currently submit their weekly hours worked using a paper-based timesheet system that is manually intensive and error- prone. We require an automated solution for submitting employee hours worked, in the form of an electronic timesheet, approving them, and paying for the time worked. In addition, we would like to have automatic notifications of timesheet status changes and a weekly reminder to submit and approve employee timesheets.

24 © Visual Patterns, Inc. 24 Project Kickoff Meeting

25 © Visual Patterns, Inc. 25 Choices Of Release (High) Level Models Model with a purpose -- shared understanding! domain model user stories UI prototype & flow map architecture Release Level Models scope table, glossary, etc. CRC cards application flow map UML diagrams database model Iteration Level Models acceptance tests

26 © Visual Patterns, Inc. 26 Sample Scope Table Shared understanding: what's in and what's out

27 © Visual Patterns, Inc. 27 Domain Model Shared understanding: business concepts > key domain objects

28 © Visual Patterns, Inc. 28 User Stories Or Use Cases Shared understanding: features required of software 3 XP Style User Story Card Use Case - Casual, Brief or Fully Dressed

29 © Visual Patterns, Inc. 29 User Interface (UI) Prototype Shared understanding: functionality, look-and-feel, etc.

30 © Visual Patterns, Inc. 30 UI Flow Map (Storyboard) Shared understanding: user interface navigation/flow

31 © Visual Patterns, Inc. 31 High-Level Architecture Diagram Shared understanding: technologies, scalability, security, reliability BEA WebLogic Server Objects managed by Spring IoC Container HTTP JDBC View JSP/HTML Controller Spring DispatcherServlet Web Browser Model Business objects, Hibernate beans Spring Scheduler RDBMS (Oracle)

32 © Visual Patterns, Inc. 32 Shared understanding: common terminology Glossary - List Of Common Business/Technical Terms Accounting The accounting department/staff. Approved Status of a timesheet when a Manager approves a previously submitted timesheet. Employee A person who works on an hourly basis and reports to a manager. Paid Status of a timesheet when the accounting department has issued a check. Etc…

33 © Visual Patterns, Inc. 33 Choices Of Iteration Level (Detailed) Models domain model user stories UI prototype & flow map architecture Release Level Models scope table, glossary, etc. CRC cards application flow map UML diagrams database model Iteration Level Models acceptance tests

34 © Visual Patterns, Inc. 34 Acceptance Tests (Serve As Detailed Requirements) Sign In The employee id can be up to 6 characters. The password must be between 8 and 10 characters. Only valid users can sign in. Timesheet List Only a user's personal timesheets can be accessed. Enter Hours Hours must contain numeric data. Daily hours cannot exceed 16 hours. Weekly hours cannot exceed 96 hours. Hours must be billed to a department. Hours can be entered as two decimal places. Employees can only view and edit their own timesheets.

35 © Visual Patterns, Inc. 35 Active Stakeholder Participation (With Business Representative)

36 © Visual Patterns, Inc. 36 Exploring Classes Using CRC Cards domain model Timesheet List screen First, let's reflect on what we know, domain model, UI and architecture Second, let's explore classes on CRC cards using both as input models free-form architecture

37 © Visual Patterns, Inc. 37 Application Flow Map (Home Grown Artifact) Complementary to class diagrams and CRC cards Can be extended using CRUD columns

38 © Visual Patterns, Inc. 38 UML Class and Package Diagrams

39 © Visual Patterns, Inc. 39 Focus Is On Working Software vs. Comprehensive Documentation “…your goal is to build a shared understanding, it isn’t to write detailed documentation.” - Scott W. Ambler “…your goal is to build a shared understanding, it isn’t to write detailed documentation.” - Scott W. Ambler Physical Models CRC cards application flow map UML diagrams database model acceptance tests Conceptual Models user stories architecture problem statement domain model scope table glossary UI prototype & flow map Implementation Data Base Code Base THE FINAL AND LASTING ARTIFACTS! UI prototypes

40 © Visual Patterns, Inc. 40 Shifting Some Upfront Design to Refactoring

41 © Visual Patterns, Inc. 41 Shifting Some Upfront Design To Refactoring (Continuous Design) Refactoring is not a new concept; the term is relatively new refactoring.com “Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior.” - Martin Fowler Over 100 refactoring techniques; for example:  Extract superclass  Extract interface  Move class  Move method

42 © Visual Patterns, Inc. 42 Agile Draw - Elegantly Simple Modeling Technique UI Flow Map Conceptual Class Diagram Visit AgileDraw.org High-Level Architecture

43 © Visual Patterns, Inc. 43 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

44 © Visual Patterns, Inc. Agile Java Development: Environment Setup (Directory Structure, JDK, Ant, and JUnit)

45 © Visual Patterns, Inc. 45 Quick Poll How many of you are using Ant, JUnit, Maven, Cruise Control, etc?

46 © Visual Patterns, Inc. 46 Personal Opinion: Early Environment Setup Is Essential Involves more than people expect/plan Cycle 0 Get minimal environment setup (scripts, directory, version control, etc.) Get end-to-end demo working  Helps team Involves more than people expect/plan Cycle 0 Get minimal environment setup (scripts, directory, version control, etc.) Get end-to-end demo working  Helps team

47 © Visual Patterns, Inc. 47 Directory Structure, Naming Conventions, Version Control, etc. ➔ controller/TimesheetListController.java ➔ model/Timesheet.java ➔ model/TimesheetManager.java ➔ test/TimesheetListControllerTest.java ➔ test/TimesheetManagerTest.java ➔ view/timesheetlist.jsp

48 © Visual Patterns, Inc. 48 Ant (ant.apache.org) Ant task types Compile tasks (that is, javac) Deployment tasks File tasks such as copy, delete, move, and others. Property tasks for setting internal variables Audit/coverage tasks Database tasks Documentation tasks Execution tasks Mail tasks Preprocess tasks Property tasks Remote tasks Miscellaneous tasks (e.g. echo)

49 © Visual Patterns, Inc. 49 JUnit (junit.org) Originally written by Erich Gamma (Gang of Four, Design Patterns) Kent Beck (author of Extreme Programming and Test Driven Development) Simple framework – various assert methods assertEquals assertFalse assertNotNull assertNotSame assertNull assertSame assertTrue public class SimpleTest extends junit.framework.TestCase { int value1 = 2, value2 = 3, expectedResult = 5; public static void main(String args[]) { junit.textui.TestRunner.run(suite()); } public static Test suite() { return new TestSuite(SimpleTest.class); } public void testAddSuccess() { assertTrue(value1 + value2 == expectedResult); } public class SimpleTest extends junit.framework.TestCase { int value1 = 2, value2 = 3, expectedResult = 5; public static void main(String args[]) { junit.textui.TestRunner.run(suite()); } public static Test suite() { return new TestSuite(SimpleTest.class); } public void testAddSuccess() { assertTrue(value1 + value2 == expectedResult); }

50 © Visual Patterns, Inc. 50 JUnit GUI Based Testing Console Runner Eclipse Plug-in

51 © Visual Patterns, Inc. 51 Agile Method: Test Driven Development (TDD) w/ JUnit A term coined by Kent Beck Also, a XP practice (test-first) “Red - Green - Refactor” Several benefits to this approach: Minimal code written to satisfy requirements (nothing more, nothing less!) If code passes the unit tests, it is done! Can help design classes better (from a client/interface perspective) Refactor with confidence Write unit test code More unit test code Write some actual code More actual code Write Test FirstCode, Compile, Test

52 © Visual Patterns, Inc. 52 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

53 © Visual Patterns, Inc. Agile Java Development: Using Hibernate For Persistent Objects

54 © Visual Patterns, Inc. 54 Quick Poll What persistence solution does your project use (e.g. JDBC, ORM, entity bean)?

55 © Visual Patterns, Inc. 55 Where Hibernate Fits Into Our Architecture

56 © Visual Patterns, Inc. 56 An Overview of Object-Relational Mapping (ORM) ORM - Java object to database table/record mapping Java = objects database = relational Relationships unidirectional and bidirectional relations in a relational database are bidirectional by definition Cardinality (OO term is multiciplicity) One-to-one one-to-many many-to-one and many-to-many Object Identity Cascade Others…

57 © Visual Patterns, Inc. 57 Hibernate Basics Dialect (DB2, Microsoft SQL Server, MySQL, Oracle, PostgreSQL, SAP DB, Sybase, TimesTen…) SessionFactory, Session, and Transaction Work with Database Records (as Java Objects) Object States - persistent, detached, and transient Data Types – more than you'll likely need! Hibernate Query Language (HQL) – powerful SQL-like language

58 © Visual Patterns, Inc. 58 From Domain Model To A (Denormalized) Physical Data Model

59 © Visual Patterns, Inc. 59 Working With Hibernate - Simple Example Using Department 1. hibernate.cfg.xml – Hibernate configuration file (DB configuration) 2. Department.hbm.xml – Mapping file for our Department table 3. Department.java – Bean file with two variables: String departmentCode; String name; 4. HibernateTest.java – Simple test program (on next slide)

60 © Visual Patterns, Inc. 60 HibernateTest.java SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory(); Session session = sessionFactory.getCurrentSession(); Transaction tx = session.beginTransaction(); Department department = (Department) session.get(Department.class, "IT"); System.out.println("Name for IT = " + department.getName());... List departmentList = session.createQuery("from Department").list(); for (int i = 0; i < departmentList.size(); i++) { department = (Department) departmentList.get(i); System.out.println("Row " + (i + 1) + "> " + department.getName() + " (" + department.getDepartmentCode() + ")"); }... sessionFactory.close();

61 © Visual Patterns, Inc. 61 Other Hibernate Features Saving (save, merge, saveOrUpdate) session.saveOrUpdate(timesheet) Deleting records session.delete(Object), or session.createQuery("DELETE from Timesheet") Queries using Criteria interface (more OO and typesafe) List timesheetList = session.createCriteria(Timesheet.class).add(Restrictions.eq("employeeId", employeeId)).list(); Related classes: Restrictions, Order, Junction, Distinct, and others Locking Objects (Concurrency Control) Lots More Hibernate (associtions, annotations, filters, interceptors, scrollable iterations, native SQL, transaction management, etc.)

62 © Visual Patterns, Inc. 62 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

63 © Visual Patterns, Inc. Agile Java Development: The Spring Framework

64 © Visual Patterns, Inc. 64 Spring Modules

65 © Visual Patterns, Inc. 65 Spring Java Packaging (org.springframework.)

66 © Visual Patterns, Inc. Quick Poll Are you familiar with Inversion of Control (IoC)?

67 © Visual Patterns, Inc. 67 Dependency Injection Styles Two Supported By Spring:  Setter/getter based  Constructor based Fowler suggests a 3 rd, interface injection, Spring IoC Concepts: Beans, BeanFactory, ApplicationContext… IoC Container And Dependency Injection Pattern public class A { B myB = new B(); C myC = new C(); } public class A { B myB; C myC; public setB(B myB) public setC(C myC) Class A Class C Class B IOC Container Normal Way Using IoC

68 © Visual Patterns, Inc. 68 Benefits of Using Spring Light weight Inversion of Control (IoC) container Excellent support for POJOs (e.g. declarative transaction management) Modular – not an all-or-nothing approach Testing – dependency injection and POJOs makes for easier testing Many others No Singletons Builds on top of existing technologies (e.g. JEE, Hibernate) Robust MVC web framework Consistent database exception hierarchy (e.g. wrap SQLException)

69 © Visual Patterns, Inc. 69 Where Spring Framework Fits Into Our Architecture Optional Hibernate integration

70 © Visual Patterns, Inc. 70 Quick Poll Which web framework do you use?

71 © Visual Patterns, Inc. 71 Spring Web MVC Easier testing – mock classes, dependency injection Bind directly to business objects Clear separation of roles – validators, adaptable controllers, command (form) object, etc. Simple but powerful tag libraries Support for various view technologies and web frameworks (e.g. Struts, webwork, tapestry, JSF)

72 © Visual Patterns, Inc. 72 Spring MVC Java Concepts 1.Controller 2.ModelAndView 3.Command (Form Backing) Object 4.Validator 5.Spring Tag Library (spring:bind)

73 © Visual Patterns, Inc. 73 enterHoursController... org.springframework.web.servlet.view.JstlView /WEB-INF/jsp/.jsp enterHoursController... org.springframework.web.servlet.view.JstlView /WEB-INF/jsp/.jsp Spring MVC Configuration timex org.springframework.web.servlet.DispatcherServlet 1 timex *.htm timex org.springframework.web.servlet.DispatcherServlet 1 timex *.htm timex-servlet.xml web.xml

74 © Visual Patterns, Inc. 74 Sample End-To-End Flow Using Spring and Hibernate

75 © Visual Patterns, Inc. 75 Timesheet List: A No-Form Controller Example public class TimesheetListController implements Controller {... public ModelAndView handleRequest( HttpServletRequest request, HttpServletResponse response) mockHttpServletRequest = new MockHttpServletRequest("GET", "/timesheetlist.htm"); ModelAndView modelAndView = timesheetListController.handleRequest( mockHttpServletRequest, null); assertNotNull(modelAndView); assertNotNull(modelAndView.getModel()); mockHttpServletRequest = new MockHttpServletRequest("GET", "/timesheetlist.htm"); ModelAndView modelAndView = timesheetListController.handleRequest( mockHttpServletRequest, null); assertNotNull(modelAndView); assertNotNull(modelAndView.getModel());

76 © Visual Patterns, Inc. 76 Enter Hours: A Form Screen public class EnterHoursController extends SimpleFormController 1. EnterHoursController.java 2. EnterHoursValidator.java 3. enterhours.jsp

77 © Visual Patterns, Inc. 77 View/JSP Code – Spring and JSTL Tag Libraries ' value=' ' type="text" size="6" maxlength="6"> ' value=' ' type="text" size="6" maxlength="6"> Special (Spring) variable named status status.value status.expression status.error status.errorMessage status.errorMessages status.displayValue

78 © Visual Patterns, Inc. 78 public class HttpRequestInterceptor extends HandlerInterceptorAdapter { public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) { if (!signedIn) { response.sendRedirect(this.signInPage); return false; } public class HttpRequestInterceptor extends HandlerInterceptorAdapter { public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) { if (!signedIn) { response.sendRedirect(this.signInPage); return false; } Sign In (Authentication) - Spring HandlerInterceptor

79 © Visual Patterns, Inc. 79 Other Spring Web Stuff View with no controllers (e.g. only JSP files) urlFilenameController Spring 2.0 – new tag libraries form:form - org.springframework.web.servlet.tags.form.FormTag form:input- org.springframework.web.servlet.tags.form.InputTag form:password - org.springframework.web.servlet.tags.form.PasswordInputTag form:hidden - org.springframework.web.servlet.tags.form.HiddenInputTag form:select - org.springframework.web.servlet.tags.form.SelectTag form:option - org.springframework.web.servlet.tags.form.OptionTag form:radiobutton - org.springframework.web.servlet.tags.form.RadioButtonTag Others… Other Web Flow – gaining a lot of momentum! Wizard-like features. Portlet API – based on JSR-168 Portlet Specification (jcp.org).

80 © Visual Patterns, Inc. 80 Spring ORM Module: Support for Hibernate Management of sessionfactory and session (no close calls) Declarative transaction management in light-weight containers Easier testing (pluggable Sessionfactory via XML file) Less lines of code – focus on business logic!

81 © Visual Patterns, Inc. 81 Spring ORM Module: Support for Hibernate (cont’d) Less lines of code Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); try { session.saveOrUpdate(timesheet); session.getTransaction().commit(); } catch (HibernateException e) { session.getTransaction().rollback(); throw e; } Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); try { session.saveOrUpdate(timesheet); session.getTransaction().commit(); } catch (HibernateException e) { session.getTransaction().rollback(); throw e; } getHibernateTemplate().saveOrUpdate(timesheet);

82 © Visual Patterns, Inc. 82 More Spring… Scheduling Jobs (with Quartz or JDK timers) Spring support Much more JEE support Sub-projects (Acegi, BeanDoc, Spring IDE, etc.)

83 © Visual Patterns, Inc. 83 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

84 © Visual Patterns, Inc. Agile Java Development: The Eclipse Phenomenon!

85 © Visual Patterns, Inc. 85 Quick Poll Which IDE do you use?

86 © Visual Patterns, Inc. 86 The Eclipse Foundation, Platform and Projects Foundation Originally developed by Object Technology International (OTI), purchased by IBM ($40 million) and donated it to open source! Recruited various corporations; from eclipse.org: Industry leaders Borland, IBM, MERANT, QNX Software Systems, Rational Software, Red Hat, SuSE, TogetherSoft and Webgain formed the initial eclipse.org Board of Stewards in November By the end of 2003, this initial consortium had grown to over 80 members. My view: Eclipse foundation is similar to Apache foundation for GUI tools Platform objectives robust platform for highly integrated dev tools enable view and/or editing of any content type attract a large community of developers to develop plug-ins Projects Application Development, editors, modeling, performance, testing, reporting, and many more

87 © Visual Patterns, Inc. 87 Many Platforms Supported (Windows, Unix, Linux, Mac OS X…)

88 © Visual Patterns, Inc. 88 Personal Opinion: The Java versus Microsoft Thing First exciting IDE Huge community - Plug-ins galore (thousand+) Ward Cunningham and Erich Gamma Battle of IDEs has only now begun! First exciting IDE Huge community - Plug-ins galore (thousand+) Ward Cunningham and Erich Gamma Battle of IDEs has only now begun!

89 © Visual Patterns, Inc. 89 Eclipse Basic Concepts 1.Workspace (directory of projects) 2.Workbench 3.Perspectives 4.Editors and Views 5.Project 6.Wizards (hundreds) 7.Plug-ins (galore!) sample workspace

90 © Visual Patterns, Inc. 90 Project/Plug-in: Java Development Tools (JDT) Java views (e.g. packages, types, members) Intelligent code fix and content assist Compile during save (within the blink of an eye) Powerful debugger (than works!) Pre-configured for JUnit and Ant Others Formatting options Powerful search Code refactoring (some based on Fowler's refactoring.com) TODO lists Scrapbook Export feature (create zip files, etc.)

91 © Visual Patterns, Inc. 91 JDT Features Ant Assist Java Browsing Java Compile Errors/Warnings JUnit

92 © Visual Patterns, Inc. 92 Project/Plug-ins: Eclipse Web Tools Platform (WTP) Tools for developing J2EE Web applications Editors Source - HTML, JavaScript, CSS, JSP, SQL, XML, DTD, XSD, and WSDL Graphical - XSD and WSDL Database access and query tools and models Web service wizards J2EE - project natures, builders, models navigator

93 © Visual Patterns, Inc. WTP Web Services Related Screens

94 © Visual Patterns, Inc. 94 Other WTP Features Database Servers JSP Assist

95 © Visual Patterns, Inc. 95 CVS (Eclipse Team Sharing)

96 © Visual Patterns, Inc. 96 Hibernate and Spring Plug-Ins Hibernate Spring IDE

97 © Visual Patterns, Inc. 97 Startup Time Comparison To IntelliJ and NetBeans IntellIJ - 1 minute, 5 seconds! Eclipse with JDT, WTP, Hibernate, Eclipse seconds! NetBeans - 42 seconds.

98 © Visual Patterns, Inc. 98 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

99 © Visual Patterns, Inc. Agile Java Development: Logging, Debugging, Monitoring, and Profiling

100 © Visual Patterns, Inc. 100 Quick Poll Do you use a GUI debugger? Or, a logging framework? Or, use println statements? Do you use a GUI debugger? Or, a logging framework? Or, use println statements?

101 © Visual Patterns, Inc. 101 Logging Basics and Frameworks Types 1.Audit log 2.Tracing 3.Error reporting Pros No human intervention (automated) Great for head-less servers Cons Performance hit Can clutter code import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class CommonsLoggingTest { private static Log log = LogFactory.getLog(CommonsLoggingTest.class); public static void main(String[] args) { log.fatal("This is a FATAL message."); log.error("This is an ERROR message."); log.warn("This is a WARN message."); log.info("This is an INFO message."); log.debug("This is a DEBUG message."); } Logging Frameworks Alternative to println statements Key benefit - Output control (destination, format, log level) Most popular - Apache Log4J and JDK Logging Jakarta Commons Logging -- bridge to frameworks

102 © Visual Patterns, Inc. 102 Headaches of Finding and Fixing Bugs!

103 © Visual Patterns, Inc. 103 Debugging Java Code With Eclipse Debug perspectives and views Breakpoints Step through code Variable inspection Hotswap Remote debugging “consolidated debugging”

104 © Visual Patterns, Inc. 104 Debugging Web User Interfaces Using Mozilla Firefox JavaScript debugger Web Developer Tamper Data

105 © Visual Patterns, Inc. 105 Java Monitoring and Profiling Monitoring JSE 5.0 includes JConsole Memory issues Class loading and garbage collection Management of MBeans and JDK logging level, etc … Profiling Memory usage and leaks CPU utilization Trace objects and methods Determine performance bottlenecks Spring MBean Exporter

106 © Visual Patterns, Inc. 106 Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

107 © Visual Patterns, Inc. Beyond The Basics

108 © Visual Patterns, Inc. 108 Custom Tag Libraries public class PayPeriodCheckTag extends TagSupport { public int doStartTag() throws JspException { boolean includeText = ; // do something if (includeText) return TagSupport.EVAL_BODY_INCLUDE; return TagSupport.SKIP_BODY; }

109 © Visual Patterns, Inc. 109 Security, Reliability and Scalability Considerations

110 © Visual Patterns, Inc. 110 Application Security Considerations Authentication (user and application levels) Authorization (roles, groups, etc.) Encryption (wire protocol, configuration files) Wire protocol (HTTP/S) User-level authentication & authorization Application-level authentication

111 © Visual Patterns, Inc. 111 Other Considerations Exception Handling 1.Checked exceptions (e.g. IOException) – required catch or throw 2.Unchecked exceptions (e.g. NullPointerException) - no catch/throw needed 3.Errors (e.g. OutOfMemoryError) Clustering (serialize, no static variables, simplicity…) Multi-threading (JDK 1.5 concurrent API) Rich Internet Applications (RIA) AJaX -  Google Web Toolkit (GWT) -  Direct Web Remoting (DWR) - Adobe Flex Java Swing and Web Start

112 © Visual Patterns, Inc. 112 Cool Concept For Smaller Apps - Entire System In A WAR File! Code (source, binary) Relational database (e.g. HSQLDB) Job Scheduling More…

113 © Visual Patterns, Inc. Wrap Up!

114 © Visual Patterns, Inc. Presentation Outline Introduction to Agile Java Development Agile Processes Agile Modeling Agile Development Environment Setup: Directory Structure, JDK, Ant and JUnit Using Hibernate For Persistent Objects The Spring Framework The Eclipse Phenomenon! Logging, Debugging, Monitoring, and Profiling Beyond The Basics

115 © Visual Patterns, Inc. 115 Constant Learning – Be a “Generalizing Specialist”

116 © Visual Patterns, Inc. 116 Don’t Forget - Release Completion Celebration! RON STEVE RAJ SUSAN

117 © Visual Patterns, Inc. Some Near Term Plans

118 © Visual Patterns, Inc. 118 Book - Released 12th May, 2006 Agile Java Development With Spring, Hibernate and Eclipse Forewords by Scott W. Ambler and Rod Johnson 1. Introduction to Agile Java Development 2. The Sample Application: An Online Timesheet System 3. XP and AMDD-Based Architecture and Design Modeling 4. Environment Setup: JDK, Ant, and JUnit 5. Using Hibernate For Persistent Objects 6. Overview of the Spring Framework 7. The Spring Web MVC Framework 8. The Eclipse Phenomenon 9. Logging, Debugging, Monitoring and Profiling 10. Beyond the Basics 11. What Next? 12. Parting Thoughts Appendices (with lots of goodies) available on amazon.com

119 © Visual Patterns, Inc. 119 Interesting Stuff At VisualPatterns.com - Visit Site Periodically Comics Cheat Sheets R&D Concepts

120 © Visual Patterns, Inc. 120 THE END! agilemodeling.com agiledata.org agilemanifesto.org extremeprogramming.org hibernate.org springframework.org eclipse.org code.google.com/webtoolkit/ getahead.ltd.uk/dwr/ VisualPatterns.com (links, comics, code, cheat sheets…) Stay in touch! Stay in touch!


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