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Web frameworks in Java: 10 years of history!

Web frameworks in Java: 10 years of history!

From the Servlets/JSP to Struts, JSF and Spring @MVC: how did we get there?
(presentation from Nik Trevallyn Jones and Michael Isvy at the SingaSUG (Singapore Spring User Group).

Michael Isvy

May 08, 2014
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  1. 1
    Agenda
    Ÿ  To all attendees with a mobile phone connection: please
    answer this survey: http://tinyurl.com/singasug
    Ÿ  Nik TJ and Michael I : web frameworks in Java
    Ÿ  Salah C. and Srikanth N : Spring MVC live coding session
    N

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  2. 2
    Nik Trevallyn-Jones
    Ÿ  Contract Consultant
    Ÿ  Been teaching and Consulting on Spring since 2008
    Ÿ  Has Taught Spring to more than 1000 students in 6 years
    Ÿ  OpenSource Contributor to several Spring projects
    –  Spring HATEAOS, Spring ROO…
    M

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  3. 3
    Michael  Isvy
    Ÿ  Training Manager at Pivotal (APJ region)
    2008
    - Spring
    - Tomcat
    2009-2012
    -  Spring
    -  Tomcat
    -  Cloud Foundry
    -  GemFire…
    2013 onwards
    -  Spring, Cloud Foundry
    -  Tomcat, Redis, Hadoop
    -  GemFire
    N

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  4. 4
    Hadoop
    / Pivotal HD
    GemFire
    /SqlFire
    Apache Tomcat
    N

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  5. 5
    Web frameworks in Java
    mvc
    M

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  6. 6
    Disclaimer: framework versus standard
    Ÿ  JSF is part of Java EE specification
    Ÿ  Technically JSF is not exactly a web framework but rather a
    specification and an implementation
    –  We’ve used the word “framework” here to keep things simple
    N

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  7. 7
    2000: Servlet/JSP
    public class MyServlet extends HttpServlet {"
    "
    "
    public void doGet(HttpServletRequest req, HttpServletResponse resp) {"
    …"
    }
    public void doPost(HttpServletRequest req, HttpServletResponse resp) {"

    }
    "
    }
    Not a POJO
    Request params
    parsed manually
    Form validation done
    manually
    No I18N support

    Verbose XML config
    M

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  8. 8
    2003: Apache Struts
    public class UserAction extends Action {"
    "
    "
    public void execute(ActionMapping mapping, ActionForm form,
    HttpServletRequest req, HttpServletResponse resp) {"
    …"
    }
    "
    }
    Not a POJO
    Request params
    parsed manually
    Form validation done
    manually
    Verbose XML config

    public class UserForm extends ActionForm {"
    "
    private String name;
    public String getName() { return name; }
    public void seName(String name) { this.name = name; }"
    }
    No Internationalization support
    N

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  9. 9
    2003: Apache Struts
    Ÿ  Java community formed a consensus
    Ÿ  Quickly became the way to go for Java web frameworks
    Ÿ  So what happened next?
    9
    N

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  10. 10
    2004: JSF
    Ÿ  Struts was created by Craig McClanahan
    –  Also one of the key founders of Servlet, JSP, JSTL and Tomcat
    Ÿ  Craig wanted to create a component-oriented Web
    framework
    –  Event/Listener model
    M

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  11. 11
    2004: JSF
    Ÿ  Problem: view layer was good but some major limitations
    –  Form validation very limited
    –  Couldn’t disable JavaScript
    –  No support for “GET” methods…
    Ÿ  Specification versus framework
    –  For it to succeed, JSF should have been a framework, not a
    specification
    ▪  Frameworks can be updated every month
    ▪  Java EE Specs are updated once every 2 years
    M

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  12. 12
    2005: The JSF / Struts 1 & 2 story
    Original plan What happened
    Struts JSF
    Struts 2
    Struts WebWork
    Struts 2
    M

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  13. 13
    2005: Spring MVC without annotations
    Ÿ  Spring MVC was similar to Struts
    –  But more modern
    ▪  Easier to extend
    ▪  Well integrated for Dependency Injection
    public class UserController
    extends SimpleFormController {

    private UserService service;
    public ModelAndView
    onSubmit(Object command)
    { //... }
    }
    N
    Not a POJO
    Request params
    parsed manually
    Form validation done
    manually
    Simpler XML config

    No Internationalization support

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  14. 14
    2008: Spring @MVC
    Ÿ  Annotations are the way to go for Spring @MVC!
    public class UserController
    extends SimpleFormController {

    private UserService service;
    public ModelAndView
    onSubmit(Object command)
    { //... }
    }
    @Controller
    public class UserController {
    @Autowired
    private UserService service;
    @RequestMapping(value="/users/",
    method=RequestMethod.POST)
    public ModelAndView createUser(User user) 

    { //... }
    }
    N
    Now POJO based!!
    No XML needed for controllers anymore!!

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  15. 15
    Popularity of Java Web frameworks in 2014
    http://pages.zeroturnaround.com/RebelLabs-AllReportLanders_TheCuriousCodersGuidetoJavaWebFrameworks.html
    N

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  16. 16
    Let’s talk about CSS and Javascript
    Ÿ  Back in 2008, there were plenty of small CSS frameworks
    –  None of them really did the job
    Ÿ  Now there is Bootstrap!
    M

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  17. 17
    What is Bootstrap?
    Ÿ  Originally called “Twitter Bootstrap”
    Ÿ  Available from 2011
    Ÿ  Typography, forms, buttons, charts, navigation and other
    interface components
    Ÿ  Integrates well with jQuery
    M

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  18. 18
    Most popular project on github!
    M

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  19. 19
    Let’s talk about JavaScript
    Ÿ  Back in 2008, there were too many JavaScript frameworks
    Ÿ  Now there is jQuery!
    M

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  20. 20
    Spring @MVC and the View Layer
    Ÿ  Spring @MVC is neat and elegant on the controller side
    –  Form submission, Validation, File upload, testing…
    Ÿ  Spring @MVC is view-agnostic
    –  No much tooling for integration with CSS/JavaScript frameworks
    –  It’s your job to create the custom tags you need
    ▪  But that’s not hard!
    N

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  21. 21
    Form fields: Without custom tags

    ${lastNameLabel}







    CSS div
    Label
    Form input
    Error message (if any)
    JSP
    M

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  22. 22
    Using custom tags
    Ÿ  First create a tag (or tagx) file
    <%@ taglib prefix="form" uri="http://www.spring…org/tags/form" %>
    <%@ attribute name="name" required="true" rtexprvalue="true" %>
    <%@ attribute name="label" required="true" rtexprvalue="true" %>

    ${label}







    inputField.tag
    Custom tags are part of Java EE
    N

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  23. 23
    Using custom tags
    Ÿ  Custom tag call Folder which contains
    custom tags





    JSP file
    1 line of code
    instead of 9!!
    N

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  24. 24
    Some tags already exist!
    Ÿ  Dandelion for DataTables (nice addition to Spring @MVC)
    –  dandelion.github.com

    property="firstName" sortable="true" />
    property="lastName" sortable="true" />

    JSP file
    M

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  25. 25
    Dandelion is based on
    jQuery Datatables and Bootstrap
    Ÿ  Click, sort, scroll, search, next/previous…
    Ÿ  PDF and Excel exports…
    M

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  26. 26
    Survey results!!

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  27. 27
    Conclusion
    Ÿ  Once  upon  a  2me,  Java  community  was  unified  around  Struts!  
    Ÿ  JavaScript  and  CSS:  you  now  have  good  frameworks!  
    Ÿ  Spring  @MVC  now  is  the  most  popular  Web  framework  for  Java  
    Ÿ  Create  your  own  custom  tags  for  the  View  layer  
    Ÿ  Use  Dandelion  for  your  DataTables  
    N

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