跳至主要内容

JSF 2.3: More CDI alignments

More CDI alignments

JSF 2.2 starts CDI integration, provides built-in CDI compatible ViewScoped and @FlowScoped, and all CDI scopes are compatible with JSF.
In JSF 2.3, more CDI alignments are added.
A lots of JSF built-in facilites are exposed as CDI beans, and can be injected as general CDI beans.
In JSF 2.2, to get JSF facilites.
FacesContext context= FacesContext.getCurrentInstance();
ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
Map<String, Object> cookieMap = FacesContext.getCurrentInstance().getExternalContext().getRequestCookieMap();
Map<String, Object> viewMap = FacesContext.getCurrentInstance().getViewRoot().getViewMap();
In JSF 2.3, you can inject them directly in your backing bean.
@Inject
FacesContext facesContext;

@Inject
ExternalContext externalContext;

@Inject
@RequestCookieMap
Map<String, Object> cookieMap;

@Inject
@ViewMap
Map<String, Object> viewMap;
And all of these can be resolved via EL in facelets template.
There is a table listed all supported facilites in Arjan Tijms's blog entry, What's new in JSF 2.3? .
Artifact EL name Qualifier Type
Application #{application} - java.lang.Object (javax.servlet.ServletContext)
ApplicationMap #{applicationScope} @ApplicationMap java.util.Map<String, Object>
CompositeComponent #{cc} (Not injectable) javax.faces.component.UIComponent
Component #{component} (Not injectable) javax.faces.component.UIComponent
RequestCookieMap #{cookie} @RequestCookieMap java.util.Map<String, Object>
FacesContext #{facesContext} - javax.faces.context.FacesContext
Flash #{flash} - javax.faces.context.Flash
FlowMap #{flowScope} @FlowMap java.util.Map<Object, Object>
HeaderMap #{header} @HeaderMap java.util.Map<String, String>
HeaderValuesMap #{headerValues} @HeaderValuesMap java.util.Map<String, String[]>
InitParameterMap #{initParam} @InitParameterMap java.util.Map<String, String>
RequestParameterMap #{param} @RequestParameterMap java.util.Map<String, String>
RequestParameterValuesMap #{paramValues} @RequestParameterValuesMap java.util.Map<String, String[]>
Request #{request} (Not injectable) java.lang.Object (javax.servlet.http.HttpServletRequest)
RequestMap #{requestScope} @RequestMap java.util.Map<String, Object>
ResourceHandler #{"resource"} - javax.faces.application.ResourceHandler
Session #{session} (Not injectable) java.lang.Object (javax.servlet.http.HttpSession)
SessionMap #{sessionScope} @SessionMap java.util.Map<String, Object>
View #{view} - javax.faces.component.UIViewRoot
ViewMap #{viewScope} @ViewMap java.util.Map<String, Object>
ExternalContext #{externalContext} (new) - javax.faces.context.ExternalContext

评论

此博客中的热门博文

Build a Reactive application with Angular 5 and Spring Boot 2.0

I have created a post to describe Reactive programming supports in Spring 5 and its subprojects, all codes of this article are updated the latest Spring 5 RELEASE, check spring-reactive-sample under my Github account.
In this post, I will create a simple blog system, including:
A user can sign in and sign out.An authenticated user can create a post.An authenticated user can update a post.Only the user who has ADMIN role can delete a post.All users(including anonymous users) can view post list and post details.An authenticated user can add his comments to a certain post. The backend will be built with the latest Spring 5 reactive stack, including:
Spring Boot 2.0, at the moment the latest version is 2.0.0.M7Spring Data MongoDB supports reactive operations for MongoDBSpring Session adds reactive support for WebSessionSpring Security 5 aligns with Spring 5 reactive stack The frontend is an Angular based SPA and it will be generated by Angular CLI.
The source code is hosted on Github, …

Activating CDI in JSF 2.3

Activating CDI in JSF 2.3 When I upgraed my Java EE 7 sample to the newest Java EE 8, the first thing confused me is the CDI beans are not recoganized in Facelects template in a JSF 2.3 based web applicaiton, which is working in the development version, but in the final release version, they are always resolved as null. I filed an issue on Mojarra and discussed it with the developers from communities and the JSF experts.
According to the content of README, In a JSF 2.3 application, to activate CDI support, declaring a 2.3 versioned faces-config.xml and adding javax.faces.ENABLE_CDI_RESOLVER_CHAIN in web.xml is not enough, you have to declare @FacesConfig annotated class to enable CDI.
Here is the steps I created a workable JSF 2.3 applicatoin in Java EE 8.
Create a Java web application, this can be done easily by NetBeans IDE, or generated by Maven archetype, for exmaple.
$ mvn archetype:generate -DgroupId=com.example -DartifactId=demo -DarchetypeArtifactId=maven-archetype-w…

JPA 2.1: Attribute Converter

JPA 2.1: Attribute Converter If you are using Hibernate, and want a customized type is supported in your Entity class, you could have to write a custom Hibernate Type. JPA 2.1 brings a new feature named attribute converter, which can help you convert your custom class type to JPA supported type. Create an Entity Reuse thePostentity class as example. @Entity @Table(name="POSTS") public class Post implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name="ID") private Long id; @Column(name="TITLE") private String title; @Column(name="BODY") private String body; @Temporal(javax.persistence.TemporalType.DATE) @Column(name="CREATED") private Date created; @Column(name="TAGS") private List<String> tags=new ArrayList<>(); } Create an attribute converter In this example…