Enterprise Java and SOA


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this slide deck gives a brief background on the history of java, lists the enterprise java frameworks, mentions the principles and elements of Service Oriented Architecture and finalizes the session by giving tips and clues on how to better shape up a career on java and ways to become a leader on software development.

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Enterprise Java and SOA

  1. 1. ENTERPRISE JAVA & SOA Mert ÇALIŞKAN Doğu Akdeniz Üniversitesi 26.03.2012Friday, March 23, 12
  2. 2. Me? • Mert ÇALIŞKAN • Was working for a Defence Contractor...kind’a boring... • Now Lead SOA Architect @ T2 • Open Source Software (OSS) Advocate Founder and Committer for OS Projects • Member of Apache Software Foundation OpenLogic Expert CommunityFriday, March 23, 12
  3. 3. TO JAVA ? OR NOT ? Come to the Dark Side..!Friday, March 23, 12
  4. 4. Agenda • History of Java • Enterprise Java - mesir and its ingredients • SOA, from principles to its elements • Ways to make a better career in/with Java • Q &AFriday, March 23, 12
  5. 5. YOU KNOW THIS TRANS-ATLANTIC?Friday, March 23, 12
  6. 6. • RMS Titanic sank in North Atlantic Ocean on 15 April, 1912 on maiden voyage So Eventually Everything Dies...! Cool analogy, right? :) • You, Me, All of Us... • Companies, Technologies... • Key point is: You should avoid not making it like Titanic, which sunk in 2hrs and 40 minutes...!Friday, March 23, 12
  7. 7. Where it all began... Founded February 24, 1982 Sold to Oracle January 27, 2010 for $7.4 billion..! Sun was mainly selling Hardware, but they also working on computer software like Java, MySQL and NFS.. Founded in 1977 by Larry Ellison and a couple of clever guys, their motivation is to compete with IBM’s System R, which was a relational database.Friday, March 23, 12
  8. 8. History of JAVA • Java Language Project started in June 1991 (James Gosling and his fellas) • Running byteCode on Java Virtual Machine • WORA (Write Once, Run Anywhere) • First started with applets in the WEB world • With the dawn of Java Enterprise Edition, Servlets made their way to rule the world. The DukeFriday, March 23, 12
  9. 9. Editions of JAVA • Java Card: applets on smart cards (sim cards) • Micro Edition (ME): mobile phones + set-top boxes • Standard Edition (SE): Cool Software Platform • Enterprise Edition (EE): Oracle’s Enterprise Computing Platform • JavaFX: Aim was RIA (looks dead to me) • PersonalJava (discontinued) : Java edition for mobile and embedded systems based on Java 1.1.8Friday, March 23, 12
  10. 10. James Gosling... was the FATHER of Java Age: 68 Age: 57 $$$ makes you look younger..! Larry Ellison... is the new BOSSFriday, March 23, 12
  11. 11. CHRONOLOGY OF JAVA SE JDK 1.0 January 23, 1996 JDK 1.1 Introducing February 19, 1997 Abstract Window Toolkit Swing was on Board J2SE 1.2 December 8, 1998 HotSpot JVM J2SE 1.3 May 8, 2000 reg-ex, Java Web Start J2SE 1.4 embedded XML parser February 6, 2002 J2SE 1.5 New Cool Language Features September 30, 2004 Generics, AutoBoxing, var-args & etc...Friday, March 23, 12
  12. 12. CHRONOLOGY OF JAVA SE Renamed to Java SE instead of Java SE 6 J2SE from now on. December 11, 2006 Support for running scripting lang. like Rhino. Multi-Catch in Exceptions Java SE 7 String in switch (finally!) July 28, 2011 more cools features in the lang... Best is yet to come..! Java SE 8 lambda expressions... closures... Summer, 2013Friday, March 23, 12
  13. 13. Enterprise JAVA • Java EE = Java Enterprise Edition • Extends Java SE javax.faces.* UI + JSF Related Stuff javax.servlet.* Handling HTTP invocations javax.enterprise.inject.* CDI, Like Spring depedency Inj. javax.ejb.* EJB Stuff javax.validation.* Bean Validation javax.persistence.* Persistency javax.transaction.* Stuff for transactions javax.jms.* Messaging StuffFriday, March 23, 12
  14. 14. CHRONOLOGY OF JAVA EE J2EE 1.2 J2EE 1.3 J2EE 1.4 December 12, 1999 Sept. 12, 2001 Nov. 11, 2003 Servlet 2.2 Servlet 2.3 Servlet 2.4 JSP JAX-WS Java EE 5 Servlet 2.5 EJB JAX-RS May 11, 2006 JMS JAX-B JTA JPA JAAS JSTL Java EE 6 Servlet 3.0 JSF any many December 10, 2009 EL more...Friday, March 23, 12
  15. 15. How to choose the frameworks for WEB dev? • Compatible with Model View Controller pattern • Quality & Competency of “The Stack” • Performance & Scalability • Learning Curve & Development Speed ! don’t let cutting edge turn into bleeding edge... • Community Factor & Open Source support (forums-mailing lists & etc.)Friday, March 23, 12
  16. 16. Which stack to choose? UI Controller/Dep.Inj. JSF Struts Spring Guice HiveMind Spring MVC WebWork ZK picoContainer XWork Wicket Tapestry GWT Model/Persistence Layer Echo3 Cocoon Vaadin Hibernate iBatis Integration Toplink KODO Apache CXF Apache Axis2 IDE EclipseLink Eclipse IntelliJ Spring WS IDEA JDeveloper NetBEANSFriday, March 23, 12
  18. 18. • It’s nothing new! not “yet another java framework” • It’s a stack demonstration with OSS • Released on 01.2009 • http://code.google.com/p/mesir • 2000+ downloads • Simple Stupid Model AddressBook Contact id id 1 0..* text name creationDate email contacts phoneFriday, March 23, 12
  19. 19. Code walk-through with DEMOFriday, March 23, 12
  20. 20. SOA Service Oriented Architecture Not SOAP...! Ok, maybe it is...Friday, March 23, 12
  21. 21. WHAT SOA IS ? • Stands for Service Oriented Architecture • Software Architecture where the whole information system is regarded as a collection of services interoperated and used freely through a common interface (the service bus) independent of hardware.Friday, March 23, 12
  22. 22. WHAT SOA IS NOT ? • It’s NOT a technical standard • It’s NOT a technology • It’s NOT a concrete architecture, but it leads to one. • An application that uses web services is SOA (so wrong!)Friday, March 23, 12
  23. 23. AIM OF SOA ? • To INTEGRATE..! • Services should interact, they must exchange information... • Obey the Architectural Principles...!Friday, March 23, 12
  24. 24. ARCHITECTURAL PRINCIPLES • Loose Coupling Minimize dependencies between each other, just aware of each other... • Service Contract A set of technical data along with business information XML WS WSDL SLA Schema PolicyFriday, March 23, 12
  25. 25. ARCHITECTURAL PRINCIPLES • ServiceBlocks on top of Service Abstraction each other to build Service Oriented Environment Composite Services Level of Abstraction Business Services Infrastructure Services • Service Reusability Positioning services as reusable enterprise resourcesFriday, March 23, 12
  26. 26. Service Composability • To re-use the capability of a service to build up composed services A Big Problem Small Small Small Small Small problems Problem Problem Problem Problem collectively represent a big problem Small Small Small Small Problem Problem Problem ProblemFriday, March 23, 12
  27. 27. Service Composability Small Small Small Small Small Small Small Small Problem Problem Problem Problem Problem Problem Problem Problem A B C D E F G H Solution Logic that each address to solve a problem C Big A F Problem Solved B E D G HFriday, March 23, 12
  28. 28. Service Discoverability • Descriptive services that can be accessed via discovery mechanisms • Increase the service re-use... • Services defined with WSDL and registered to services registry • Next Step could be: WADL Web Application Description LanguageFriday, March 23, 12
  29. 29. ARCHITECTURAL ARTIFACTS 4 main artifacts that are used to shape up SOA XML is used to define the data SOAP is used to transfer the data WSDL is used to define the service UDDI is used to list the available servicesFriday, March 23, 12
  30. 30. XML • EXtensible Markup Language • To transport and store data (unlike HTML, which is just to display the data) • Created by W3C (World Wide Web Consortium) 123456 Mr, Mert, Caliskan, Ogretmenler Cad. No 6/A, , Cankaya, Ankara, 06300, Turkey Any idea what this comma separated stuff is?Friday, March 23, 12
  31. 31. XML Decompose the data... <order> <orderNo>123456</orderNo> <shipTo> <name>Mr Mert Caliskan</name> <address>Ogretmenler Cad. No 6/A, Cankaya, Ankara, 06300, Turkey</address> </shipTo> </order>Friday, March 23, 12
  32. 32. XML Cool but it got more makes more sense now? gibberish than before? <order> ! <orderNo>123456</orderNo> ! <shipTo> how do we validate ! ! <name> ! ! ! <title>Mr</title> this bulk load of string? ! ! ! <firstName>Mert</firstName> ! ! </name> ! ! <address> ! ! ! <addressLine1>Ogretmenler Cad. No 6/A</addressLine1> ! ! ! <addressLine2></addressLine2> ! ! ! <county>Cankaya</country> ! ! ! <city>Ankara</zip> ! ! ! <zip>06500</zip> ! ! ! <country>Turkey</country> ! ! </address> ! </shipTo> </order>Friday, March 23, 12
  33. 33. XSD • XML Schema Daefinition <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://rubiconred.com/obay/xsd/common" targetNamespace="http://rubiconred.com/obay/xsd/common" elementFormDefault="qualified or unqualified"> <xsd:element name="address" type="tAddress"/> <xsd:complexType name="tAddress"> <xsd:sequence> <xsd:element name="addressLine1" type="xsd:string"/> <xsd:element name="addressLine2" type="xsd:string"/> <xsd:element name="city" type="xsd:string"/> <xsd:element name="state" type="xsd:string"/> <xsd:element name="zip" type="xsd:string"/> <xsd:element name="country" type="xsd:string"/> </xsd:sequence> </xsd:complexType> </xsd:schema>Friday, March 23, 12
  34. 34. SOAP • Simple Object Access Protocol • Cross platform (platform independent) remote calls (usually over HTTP) with XML messages • Could be done also with SMTP (a.k.a. emailing) Envelope optional required (one or more) Header Body Content FaultFriday, March 23, 12
  35. 35. WSDL • Web Service Definition Language / XML Based • Describes the Point of Contact for Service Provider • Defines Structure of messages Physical location of service • No need to generate the WSDL, server is doing that for us...Friday, March 23, 12
  36. 36. What Does WSDL Look Like? <definitions name="EndorsementSearch" targetNamespace="http://namespaces.snowboard-info.com" xmlns:es="http://www.snowboard-info.com/EndorsementSearch.wsdl" xmlns:esxsd="http://schemas.snowboard-info.com/EndorsementSearch.xsd" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns="http://schemas.xmlsoap.org/wsdl/"> <!-- omitted types section with content model schema info --> <message name="GetEndorsingBoarderRequest"> <part name="body" element="esxsd:GetEndorsingBoarder"/> </message> <message name="GetEndorsingBoarderResponse"> <part name="body" element="esxsd:GetEndorsingBoarderResponse"/> </message> Your Eyes Hurt, aren’t they? <portType name="GetEndorsingBoarderPortType"> <operation name="GetEndorsingBoarder"> <input message="es:GetEndorsingBoarderRequest"/> <output message="es:GetEndorsingBoarderResponse"/> <fault message="es:GetEndorsingBoarderFault"/> </operation> </portType> <binding name="EndorsementSearchSoapBinding" type="es:GetEndorsingBoarderPortType"> <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="GetEndorsingBoarder"> <soap:operation soapAction="http://www.snowboard-info.com/EndorsementSearch"/> <input> <soap:body use="literal" namespace="http://schemas.snowboard-info.com/EndorsementSearch.xsd"/> </input> <output> <soap:body use="literal" namespace="http://schemas.snowboard-info.com/EndorsementSearch.xsd"/> </output> <fault> <soap:body use="literal" namespace="http://schemas.snowboard-info.com/EndorsementSearch.xsd"/> </fault> </operation> </binding> <service name="EndorsementSearchService"> <documentation>snowboarding-info.com Endorsement Service</documentation> <port name="GetEndorsingBoarderPort" binding="es:EndorsementSearchSoapBinding"> <soap:address location="http://www.snowboard-info.com/EndorsementSearch"/> </port> </service> </definitions>Friday, March 23, 12
  37. 37. What Does WSDL Look Like? optional required Service (one or Description more) Type Message PortType Binding Service relates with contains input and knows its output message Operation Port EndpointFriday, March 23, 12
  38. 38. ReST Representational e • Resource Identification through State URI Transfer • Resource: Any "Thing", Anything you would want to point to. • Representation: Serializable description of resource could be images (jpg, png), XML or JSON data • via HTTP Methods GET / PUT / POST / DELETEFriday, March 23, 12
  39. 39. ReST Example Requirement: Give me the employee with id: 1234 Old School WS Method Invocation: Employee employeeWS.getEmployee(Long id) Cool ReST way: GET /myApp/employees/1234 HTTP/1.1Friday, March 23, 12
  40. 40. ReST Example Response in JSON: {     "employee": { "id": "481", "name": "Mert", "lastname": "Caliskan", "roles": [ "SOA Architect", "Lazy Developer", "Coding Monkey" ] }Friday, March 23, 12
  41. 41. ReST... Final Words... ReST is handy, simple to integrate with. But, Not solving real world problems like Security, Transactions and etc. (WS-* are still in need) Documentation is still needed for resources, representations... (no WSDL remember?) Fact: Everything we do over HTTP is "ReST"...!Friday, March 23, 12
  42. 42. ReST is just CRUD • You can expose your DB on WEB :) • Simple & Stupid... HTTP SQL CRUD POST INSERT Create GET SELECT Read PUT UPDATE Update DELETE DELETE DeleteFriday, March 23, 12
  43. 43. Public WS and ReST to play around http://www.service-repository.com Weather Services Google Questions Movies and many more... For ReST, check out:Friday, March 23, 12
  44. 44. Create WS with Annotations • @WebService() Marks a Java class as implementing a Web Service. • @WebMethod(operationName = "add") Customizes a method that is exposed as a Web Service operation. • @WebParam(name = "type") Customizes the parameters of the Operation.Friday, March 23, 12
  45. 45. DEMO • Let’s create a couple of Services with JAX-WS (SOAP based) & JAX-RS (REST based) • JAX-WS • JAX-RS } Reference ImplementationsFriday, March 23, 12
  46. 46. WEB SERVICES • Functionality packaged as a single unit exposed to network • WSDL (Web Service Definition Language) / XML based • WSDL 1.1 and WSDL 2.0 versions Service Registry Find Publish Service Service Requestor Bind + Invoke ProducerFriday, March 23, 12
  47. 47. many vendors out there, so standardization needs to be done..!Friday, March 23, 12
  48. 48. THE WS-* STANDARDS WS-Addressing WS-MakeConnection WS-AtomicTransaction WS-Management WS-BPEL WS-Management Catalog WS-BaseFaults WS-MetadataExchange WS-BaseNotification WS-Notification WS-BrokeredNotification WS-Policy WS-BusinessActivity WS-PolicyAssertions WS-CAF WS-PolicyAttachment WS-CDL WS-Provisioning WS-CF WS-RM Policy Assertion WS-Choreography WS-Reliability WS-Context WS-ReliableMessaging WS-Coordination WS-Resource WS-Discovery WS-Resource Framework (WSRF) WS-Enumeration WS-ResourceLifetime WS-Eventing WS-ResourceProperties WS-Federation WS-ResourceTransfer WS-Federation Active Requestor Profile WS-SecureConversation WS-Federation Passive Requestor Profile WS-Security WS-Fragment WS-SecurityPolicy WS-Inspection WS-ServiceGroupFriday, March 23, 12
  49. 49. THE STANDARDS WS-Addressing WS-MakeConnection WS-AtomicTransaction WS-Management WS-BPEL WS-Management Catalog WS-BaseFaults WS-MetadataExchange WS-BaseNotification WS-Notification WS-BrokeredNotification WS-Policy WS-BusinessActivity WS-PolicyAssertions 48 WS-CAF WS-PolicyAttachment WS-CDL WS-Provisioning WS-CF WS-RM Policy Assertion WS-Choreography WS-Reliability WS-Context WS-ReliableMessaging WS-Coordination WS-Resource WS-Discovery WS-Resource Framework (WSRF) WS-Enumeration WS-ResourceLifetime WS-Eventing WS-ResourceProperties WS-Federation WS-ResourceTransfer WS-Federation Active Requestor Profile WS-SecureConversation WS-Federation Passive Requestor Profile WS-Security WS-Fragment WS-SecurityPolicy WS-Inspection WS-ServiceGroupFriday, March 23, 12
  50. 50. UDDI • Universal Discovery and Directory Interface • Started in early 2000s • XML based Service Discovery Protocol • Think of it as yellow pages • Included in the WS-I standard • Not widely adopted as hoped, Microsoft removed it from Windows Server OS. • OSS implementation: juddi.apache.orgFriday, March 23, 12
  51. 51. Career in JAVA • Participate in Open Source Be a Contributor / or better, be a Committer • Learn the Language from inside out... • Oracle Certifications are one way to go Java SE 7 Programmer Java EE6 Web Component Developer Java EE6 Enterprise JavaBeans Developer Java EE6 Java Persistence API Developer Java EE6 Web Services Developer Java EE 5 Enterprise ArchitectFriday, March 23, 12
  52. 52. To be a Leader Experience Communication Knowledge Professionalism CreativityFriday, March 23, 12
  53. 53. To be a Leader Know broad... Know deep... Experience Communication Knowledge Professionalism Creativity If you know .NET, go ahead and learn Java. If you know Java move to Objective-C, Scala & etc. Know you stuff very well...Friday, March 23, 12
  54. 54. To be a Leader Stay Current... Use your knowledge... Experience Communication Knowledge Professionalism Creativity Practice... Practice... Practice...Friday, March 23, 12
  55. 55. To be a Leader Be Open-Minded... Experience Communication Knowledge Professionalism Creativity Listen to people’s thoughts.. They’re more valuable than you think..You CANNOT know everything..!Friday, March 23, 12
  56. 56. To be a Leader Reject the status quo... Experience Communication Knowledge Professionalism Creativity Don’t be a rebellion but don’t kill the rebellion inside you...Friday, March 23, 12
  57. 57. To be a Leader Take and accept the responsibility... Experience Communication Knowledge Professionalism Creativity Make it all in a classy way...Friday, March 23, 12
  58. 58. Resume Preparation • People skim resumes... So make it to the point as much as possible • It’s not what you know. It’s what you’ve done with what you know... • Keep it short 1 to 3 sentences, 1 to 3 pages at mostFriday, March 23, 12
  59. 59. To sum up on career... • You are the one that will be building your OWN career. • Work for your employer and work for yourself also... • Take the time to build your skills: your knowledge, your communication skills, your experience • And don’t kill the child inside you, make it creative as always... • Act Professional, because you have to be a ONE..!Friday, March 23, 12
  60. 60. To sum up... • JAVA is still HOT TOPIC... • Oracle is investing on Java so best is yet to come. • SOA is not a hype anymore, big vendors are taking parts in the market with cool tools.. • Take a leap, dive into Java, build your career on it.Friday, March 23, 12
  61. 61. Teşekkürler..! mert@t2.com.tr http://www.jroller.com/mert @mertcalFriday, March 23, 12