MVC 1.0 - by Example @ Devoxx Morocco 2015

MVC 1.0, as specified by JSR 371, is targeted for the upcoming Java EE 8 release.
In this session I will go through the fundamentals of this specification and explain the core concepts.

The session will include lots of code samples and tips to where to get started using this awesome technology.

Transcript

1. #DevoxxMA #JSR371 @ivar_grimstad
   MVC 1.0 - by Example
   Ivar Grimstad
   Principal Consultant, Cybercom Sweden
   JCP Expert Group Member JSRs 368, 371, 375
   

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2. #DevoxxMA #JSR371 @ivar_grimstad
   @ivar_grimstad
   https://github.com/ivargrimstad
   https://www.linkedin.com/in/ivargrimstad
   http://lanyrd.com/profile/ivargrimstad/
   

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3. #DevoxxMA #JSR371 @ivar_grimstad
   Why?
   

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4. #DevoxxMA #JSR371 @ivar_grimstad
   https://java.net/downloads/javaee-spec/JavaEE8_Community_Survey_Results.pdf
   

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5. #DevoxxMA #JSR371 @ivar_grimstad
   http://glassfish.org/survey
   

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6. #DevoxxMA #JSR371 @ivar_grimstad
   JSR 371
   
   Expert Group
   JSR 371 Expert Group
   

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7. #DevoxxMA #JSR371 @ivar_grimstad
   Action-based MVC
   

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8. #DevoxxMA #JSR371 @ivar_grimstad
   Controller
   Model View
   Request
   Update
   Update
   

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9. #DevoxxMA #JSR371 @ivar_grimstad
   Controller
   Model View
   Request
   Update
   Update
   

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10. #DevoxxMA #JSR371 @ivar_grimstad
    Controller
    Model View
    Request
    Update
    Update
    

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11. #DevoxxMA #JSR371 @ivar_grimstad
    Comparable Frameworks
    • Spring MVC
    
    • around since 2005
    
    • “Real World” since 2008 (Spring 2.5 onward)
    
    • today’s leader in Action-Land
    
    • Struts 2
    
    • around since 2004 (WebWork 2)
    
    • “Real World” since 2007 (Struts 2.0.9 onward)
    
    • still widely adopted
    

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12. #DevoxxMA #JSR371 @ivar_grimstad
    Existing Java EE Technologies
    

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13. #DevoxxMA #JSR371 @ivar_grimstad
    Key Decisions
    

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14. #DevoxxMA #JSR371 @ivar_grimstad
    Key Decisions
    

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15. #DevoxxMA #JSR371 @ivar_grimstad
    Build MVC 1.0 on top of JAX-RS
    

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16. #DevoxxMA #JSR371 @ivar_grimstad
    Controllers
    

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17. #DevoxxMA #JSR371 @ivar_grimstad
    Controller
    public class HelloController {
    }
    

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18. #DevoxxMA #JSR371 @ivar_grimstad
    Controller
    @Path(“hello”)
    public class HelloController {
    }
    

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19. #DevoxxMA #JSR371 @ivar_grimstad
    Controller
    @Controller
    @Path(“hello”)
    public class HelloController {
    }
    

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20. #DevoxxMA #JSR371 @ivar_grimstad
    Views
    

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21. #DevoxxMA #JSR371 @ivar_grimstad
    View
    @Controller
    @Path(“hello”)
    public class HelloController {
    }
    

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22. #DevoxxMA #JSR371 @ivar_grimstad
    View
    @Controller
    @Path(“hello”)
    public class HelloController {
    @GET
    public String hello() {
    return “hello.jsp”;
    }
    }
    

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23. #DevoxxMA #JSR371 @ivar_grimstad
    View
    @Controller
    @Path(“hello”)
    public class HelloController {
    @GET
    public Viewable hello() {
    return new Viewable(“hello.jsp”);
    }
    }
    

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24. #DevoxxMA #JSR371 @ivar_grimstad
    View
    @Controller
    @Path(“hello”)
    public class HelloController {
    @GET
    public Response hello() {
    return Response.status(OK).entity(“hello.jsp”).build();
    }
    }
    

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25. #DevoxxMA #JSR371 @ivar_grimstad
    View
    @Controller
    @Path(“hello”)
    public class HelloController {
    @View(“hello.jsp”)
    @GET
    public void hello() {
    }
    }
    

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26. #DevoxxMA #JSR371 @ivar_grimstad
    View
    @View(“hello.jsp”)
    @Controller
    @Path(“hello”)
    public class HelloController {
    @GET
    public void hello() {
    }
    }
    

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27. #DevoxxMA #JSR371 @ivar_grimstad
    Models
    

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28. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    @View(“hello.jsp”)
    @Controller
    @Path(“hello”)
    public class HelloController {
    @GET
    public void hello() {
    }
    }
    

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29. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    @Named(“greeting”)
    @RequestScoped
    public class Greeting {
    private String message;
    public void setMessate(String message) {
    this.message = message;
    }
    public void getMessage() { return message; }
    }
    

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30. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    @View(“hello.jsp”)
    @Controller
    @Path(“hello”)
    public class HelloController {
    @Inject
    private Greeting greeting;
    @GET
    public void hello() {
    greeting.setMessage(“Hello Devoxx!”);
    }
    }
    

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31. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    pageEncoding="UTF-8"%>
    
    
    
    MVC 1.0 Hello Demo
    
    
    Hello ${greeting.message}
    
    
    

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32. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    @View(“hello.jsp”)
    @Controller
    @Path(“hello”)
    public class HelloController {
    @GET
    public void hello() {
    }
    }
    

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33. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    @View(“hello.jsp”)
    @Controller
    @Path(“hello”)
    public class HelloController {
    @Inject
    private Models model;
    @GET
    public void hello() {
    model.put(“message”, “Hello Devoxx!”);
    }
    }
    

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34. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    pageEncoding="UTF-8"%>
    
    
    
    MVC 1.0 Hello Demo
    
    
    Hello ${message}
    
    
    

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35. #DevoxxMA #JSR371 @ivar_grimstad
    Validation
    

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36. #DevoxxMA #JSR371 @ivar_grimstad
    @Controller
    @Path("form")
    public class FormController {
    @POST
    public Response formPost(@Valid @BeanParam FormDataBean f) {
    return Response.status(OK).entity(“data.jsp”).build();
    }
    }
    Validation
    ConstraintValidationException
    @Min, @NotNull
    etc.
    

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37. #DevoxxMA #JSR371 @ivar_grimstad
    Validation
    public class FormViolationMapper implements
    ExceptionMapper {
    public Response toResponse(ConstraintViolationException e) {
    Set> s =e.getConstraintViolations();
    // process violations ...
    return Response.status(BAD_REQUEST)
    .entity(“error.jsp”).build();
    }
    }
    

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38. #DevoxxMA #JSR371 @ivar_grimstad
    @Controller
    @Path("form")
    public class FormController {
    @Inject private BindingResult br;
    @POST
    public Response formPost(@Valid @BeanParam FormDataBean f) {
    if (br.isFailed()) {
    return Response.status(BAD_REQUEST)
    .entity(“error.jsp”).build();
    }
    return Response.status(OK).entity(“data.jsp”).build();
    }
    }
    Validation
    Allows for MVC Error Handling
    

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39. #DevoxxMA #JSR371 @ivar_grimstad
    Show me the CODE !
    

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40. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    ReservationCtl
    Update
    confirmation
    reservation
    OK
    Browser
    POST
    

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41. #DevoxxMA #JSR371 @ivar_grimstad
    Model
    ReservationCtl
    Access
    Update
    ConfirmationCtl
    GET
    confirmation
    reservation
    OK
    Redirect
    Browser
    POST
    

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42. #DevoxxMA #JSR371 @ivar_grimstad
    Scopes
    

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43. #DevoxxMA #JSR371 @ivar_grimstad
    @RedirectScoped
    @Named(“greeting”)
    @RedirectScoped
    public class Greeting {
    private String message;
    public void setMessate(String message) {
    this.message = message;
    }
    public void getMessage() { return message; }
    }
    

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44. #DevoxxMA #JSR371 @ivar_grimstad
    @Controller
    public class HelloController {
    @Inject
    private Greeting greeting;
    @POST
    @Path(“from”)
    public String hello() {
    greeting.setMessage(“Hello Devoxx!”);
    return “redirect:/to“;
    }
    }
    @RedirectScoped
    @RedirectScoped
    @RequestScoped
    

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45. #DevoxxMA #JSR371 @ivar_grimstad
    @Controller
    public class HelloController {
    @Inject
    private Greeting greeting;
    @POST
    @Path(“to”)
    public String hello() {
    return “here.jsp“;
    }
    }
    @RedirectScoped
    Same Bean
    

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46. #DevoxxMA #JSR371 @ivar_grimstad
    Security
    

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47. #DevoxxMA #JSR371 @ivar_grimstad
    Cross Site Request Forgery
    @Controller
    @Path(“csrf”)
    public class HelloController {
    @CsrfValid
    @POST
    public Response post(@FormParam(“greeting") String greet {
    }
    }
    

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48. #DevoxxMA #JSR371 @ivar_grimstad
    Cross Site Request Forgery
    
    
    
    
    MVC 1.0 Hello Demo
    
    
    charset="utf-8">
    
    value="${mvc.csrf.token}"/>
    
    
    
    

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49. #DevoxxMA #JSR371 @ivar_grimstad
    View Engines
    

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50. #DevoxxMA #JSR371 @ivar_grimstad
    Bring Your Own View Engine
    

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51. #DevoxxMA #JSR371 @ivar_grimstad
    ViewEngine
    public interface ViewEngine {
    boolean supports(String view);
    void processView(ViewEngineContext context)
    throws ViewEngineException;
    }
    

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52. #DevoxxMA #JSR371 @ivar_grimstad
    View Engine Conflicts
    @Priority(OUTRAGEOSLY_HIGH)

    @ApplicationScoped

    public class FreemarkerViewEngine extends ViewEngineBase {
    …
    }
    

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53. #DevoxxMA #JSR371 @ivar_grimstad
    Events
    

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54. #DevoxxMA #JSR371 @ivar_grimstad
    BeforeControllerEvent
    AfterControllerEvent
    BeforeProcessViewEvent
    AfterProcessViewEvent
    ControllerRedirectEvent
    

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55. #DevoxxMA #JSR371 @ivar_grimstad
    Events Example
    @ApplicationScoped
    public class EventObserver {
    void onBeforeController(@Observes BeforeControllerEvent e)
    {
    println("URI: " + e.getUriInfo().getRequestURI());
    }
    void onAfterController(@Observes AfterControllerEvent e) {
    println("Controller: " +
    e.getResourceInfo().getResourceMethod());
    }
    }
    

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56. #DevoxxMA #JSR371 @ivar_grimstad
    Summary
    

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57. #DevoxxMA #JSR371 @ivar_grimstad
    Project Page
    https://java.net/projects/mvc-spec
    Mailing List
    users@mvc-spec.java.net
    Reference Implementation
    https://ozark.java.net
    

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58. #DevoxxMA #JSR371 @ivar_grimstad
    Samples
    https://github.com/ivargrimstad/mvc-samples
    Blog
    http://www.agilejava.eu/
    

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