MVC 1.0 - by Example @ JavaLand 2016

@ivar_grimstad
MVC 1.0 - JavaLand 2016
MVC 1.0 - by Example
Ivar Grimstad
Principal Consultant, Cybercom Sweden
JCP Expert Group Member (JSRs 368, 371, 375)
JSR 371

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@ivar_grimstad
@ivar_grimstad
https://github.com/ivargrimstad
https://www.linkedin.com/in/ivargrimstad
http://lanyrd.com/proﬁle/ivargrimstad/

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@ivar_grimstad
Why?

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@ivar_grimstad
https://java.net/downloads/javaee-spec/JavaEE8_Community_Survey_Results.pdf

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@ivar_grimstad
http://glassﬁsh.org/survey

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@ivar_grimstad
JSR 371 Expert Group

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@ivar_grimstad
Action-based MVC

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@ivar_grimstad
Controller
Model View
Request
Update
Update

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@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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@ivar_grimstad
Existing Java EE
Technologies

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Key Decisions

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@ivar_grimstad
Build MVC 1.0 on top
of JAX-RS

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@ivar_grimstad
Controllers

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@ivar_grimstad
Controller
public class HelloController {
}

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@ivar_grimstad
Controller
@Path(“hello”)
}

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@ivar_grimstad
Controller
@Controller
@Path(“hello”)
}

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@ivar_grimstad
Views

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@ivar_grimstad
View
@Controller
@Path(“hello”)
}

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@ivar_grimstad
View
@Controller
@Path(“hello”)
@GET
public String hello() {
return “hello.jsp”;
}
}

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@ivar_grimstad
View
@Controller
@Path(“hello”)
@GET
public Viewable hello() {
return new Viewable(“hello.jsp”);
}
}

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@ivar_grimstad
View
@Controller
@Path(“hello”)
@GET
public Response hello() {
return Response.status(OK).entity(“hello.jsp”).build();
}
}

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@ivar_grimstad
View
@Controller
@Path(“hello”)
@View(“hello.jsp”)
@GET
public void hello() {
}
}

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@ivar_grimstad
View
@Controller
@Path(“hello”)
@GET
}
}

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@ivar_grimstad
Models

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@ivar_grimstad
Model
@Controller
@Path(“hello”)
@GET
}
}

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@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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@ivar_grimstad
Model
@Controller
@Path(“hello”)
@Inject
private Greeting greeting;
@GET
greeting.setMessage(“Hello JavaLand!”);
}
}

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@ivar_grimstad
Model
pageEncoding="UTF-8"%>

MVC 1.0 Hello Demo

Hello ${greeting.message}

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@ivar_grimstad
Model
@Controller
@Path(“hello”)
@GET
}
}

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@ivar_grimstad
Model
@Controller
@Path(“hello”)
@Inject
private Models model;
@GET
model.put(“message”, “Hello JavaLand!”);
}
}

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Model
pageEncoding="UTF-8"%>

MVC 1.0 Hello Demo

Hello ${message}

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Validation

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@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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@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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@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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Show me the CODE !

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Model
ReservationCtl
Update
conﬁrmation
reservation
OK
Browser
POST

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@ivar_grimstad
Model
ReservationCtl
Access
Update
ConﬁrmationCtl
GET
conﬁrmation
reservation
OK
Redirect
Browser
POST

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Scopes

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@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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@ivar_grimstad
@Controller
@Inject
@POST
@Path(“from”)
greeting.setMessage(“Hello JavaLand!”);
return “redirect:/to“;
}
}
@RedirectScoped
@RedirectScoped
@RequestScoped

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@ivar_grimstad
@RedirectScoped
Same Bean
@Controller
@Inject
@POST
@Path(“to”)
return “here.jsp“;
}
}

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Security

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@ivar_grimstad
Cross Site Request Forgery
@Controller
@Path(“csrf”)
@CsrfValid
@POST
public Response post(@FormParam(“greeting") String greet {
}
}

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@ivar_grimstad
Cross Site Request Forgery

MVC 1.0 Hello Demo

value="${mvc.csrf.token}"/>

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View Engines

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@ivar_grimstad
Bring Your Own View
Engine

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

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@ivar_grimstad
View Engine Conﬂicts
@Priority(OUTRAGEOSLY_HIGH) 
@ApplicationScoped 
public class FreemarkerViewEngine extends ViewEngineBase {
…
}

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@ivar_grimstad
Events

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@ivar_grimstad
BeforeControllerEvent
AfterControllerEvent
BeforeProcessViewEvent
AfterProcessViewEvent
ControllerRedirectEvent

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@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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@ivar_grimstad
Summary

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@chkal @ivar_grimstad
Project Page
https://java.net/projects/mvc-spec
GitHub
https://github.com/mvc-spec
Reference Implementation
https://ozark.java.net

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

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@ivar_grimstad
cybercom.com

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MVC 1.0 - by Example @ JavaLand 2016

MVC 1.0 - by Example @ JavaLand 2016

ivargrimstad

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