{"id":209,"date":"2016-01-19T01:55:30","date_gmt":"2016-01-19T00:55:30","guid":{"rendered":"http:\/\/itblog.inginea.eu\/?p=209"},"modified":"2023-03-18T11:35:17","modified_gmt":"2023-03-18T10:35:17","slug":"mvc-1-0-in-java-ee-8-getting-started-using-facelets","status":"publish","type":"post","link":"https:\/\/ondro.inginea.eu\/index.php\/mvc-1-0-in-java-ee-8-getting-started-using-facelets\/","title":{"rendered":"MVC 1.0 in Java EE 8: Getting started using facelets"},"content":{"rendered":"\n

MVC 1.0 is an action-based Model-View-Controller web framework, which will be a part of future Java EE 8. It will live side by side with component-based JSF framework and will provide an alternative for building HTML+javascript oriented applications with full control over URLs.<\/p>\n\n\n\n

This post summarizes what needs to be done in order to use Facelets instead of default JSP as a view technology for MVC framework.<\/p>\n\n\n\n\n\n\n\n

Introduction<\/h2>\n\n\n\n

Although MVC is a fresh new framework, the default view technology used in most examples – JSP – is rather old and sometimes cumbersome. On the other hand, the older brother JSF already builds on more modern and flexible Facelets.<\/p>\n\n\n\n

Fortunately, MVC framework has been designed to support many alternative view technologies out of the box, including Facelets.<\/p>\n\n\n\n

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Need help with GlassFish, Jakarta\u00a0EE, Java in the cloud?<\/strong><\/a><\/p>\n\n\n\n

Follow me at OmniFish<\/strong>! <\/a><\/p>\n<\/div>

\"\"<\/a><\/figure><\/div>\n<\/div><\/div>\n\n\n\n

Getting started<\/h2>\n\n\n\n

Although Java EE 8 is not yet released, it is possible to use MVC framework already in some Java EE 7 servers, as the reference implementation of the MVC specification<\/a> named Ozark<\/a> is already almost complete.<\/p>\n\n\n\n

Ozark is reported to work with application servers Glassfish 4.1.1<\/a> and Payara 4.1<\/a>. I recommend to run the application on one of them otherwise you risk some glitches here and there.<\/p>\n\n\n\n

Until Java EE 8 is released, it is necessary to add dependency on ozark maven artifact with default scope `compile` on top of Java EE 7 API:<\/p>\n\n\n

    <dependency<\/span>><\/span>\n      <groupId<\/span>><\/span>javax<\/groupId<\/span>><\/span>\n      <artifactId<\/span>><\/span>javaee-web-api<\/artifactId<\/span>><\/span>\n      <version<\/span>><\/span>7.0<\/version<\/span>><\/span>\n      <scope<\/span>><\/span>provided<\/scope<\/span>><\/span>\n    <\/dependency<\/span>><\/span>\n    <dependency<\/span>><\/span>\n      <groupId<\/span>><\/span>org.glassfish.ozark<\/groupId<\/span>><\/span>\n      <artifactId<\/span>><\/span>ozark<\/artifactId<\/span>><\/span>\n      <version<\/span>><\/span>1.0.0-m02<\/version<\/span>><\/span>\n      <scope<\/span>><\/span>compile<\/scope<\/span>><\/span>\n    <\/dependency<\/span>><\/span>\n<\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
That’s all what is needed to set up the project. You are now ready to use new MVC framework with Java EE!<\/p>\n\n\n\n
Controller<\/h2>\n\n\n\n
MVC framework is built on top of JAX-RS and integrates with CDI and Bean Validation. Hence, MVC Controller is a JAX-RS resource, just annotated with `@javax.mvc.annotation.Controller`:<\/p>\n\n\n
@Path<\/span>(\"\/hello\"<\/span>)\n<\/span><\/span>@Controller<\/span>\n<\/span><\/mark>@RequestScoped<\/span>\n<\/span><\/span>public<\/span> class<\/span> HelloController<\/span> <\/span>{\n<\/span><\/span>\n<\/span><\/span>    @Inject<\/span>\n<\/span><\/span>    private<\/span> Models model;\n<\/span><\/mark>    \n<\/span><\/span>    @GET<\/span>\n<\/span><\/span>    public<\/span> String doGet<\/span>()<\/span> <\/span>{\n<\/span><\/span>        model.put(\"hello\"<\/span>, \"Hello MVC 1.0\"<\/span>);\n<\/span><\/span>        \n<\/span><\/span>        return<\/span> \"hello.xhtml\"<\/span>;\n<\/span><\/mark>    }\n<\/span><\/span>}\n<\/span><\/span>\n<\/span><\/span><\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
The controller contains business logic and glues a model to a view in result.<\/p>\n\n\n\n
The view is simply identified by the string returned from controller action. To use facelets, it is enough to specify a path, which will be mapped to the Facelets servlet (we use xhtml<\/code> suffix by convention).<\/p>\n\n\n\n
The model is represented by injected `Models` object.<\/p>\n\n\n\n
A few things to note here. First, as the controller is a JAX-RS resource, it is necessary to create also JAX-RS application configuration – a class that extends javax.ws.rs.core.Application<\/code>.<\/p>\n\n\n\n
Model<\/h2>\n\n\n\n
The model consists of objects identified by String<\/code> keys, which are turned into variables in the view page.<\/p>\n\n\n\n
There are 2 ways how to define the model. The first is to inject javax.mvc.Models<\/code> into the controller, which is effectively a map. The controller action then puts objects into the injected model under String<\/code> keys.<\/p>\n\n\n\n
JSP and Facelets support also arbitrary CDI beans marked with @Named<\/code> CDI qualifier. This way, you may turn any CDI bean into a model just by putting the @Named<\/code> annotation on it.<\/p>\n\n\n\n
View<\/h2>\n\n\n\n
And now to the core of this post – we will use facelets to display data in our model. In fact, using Facelets as the view technology is equally easy as using JSPs. It only requires to setup the Facelets servlet properly.<\/p>\n\n\n
    <servlet<\/span>><\/span>\n<\/span><\/span>        <servlet-name<\/span>><\/span>Faces Servlet<\/servlet-name<\/span>><\/span>\n<\/span><\/span>        <servlet-class<\/span>><\/span>javax.faces.webapp.FacesServlet<\/servlet-class<\/span>><\/span>\n<\/span><\/mark>        <load-on-startup<\/span>><\/span>1<\/load-on-startup<\/span>><\/span>\n<\/span><\/span>    <\/servlet<\/span>><\/span>\n<\/span><\/span>    <servlet-mapping<\/span>><\/span>\n<\/span><\/span>        <servlet-name<\/span>><\/span>Faces Servlet<\/servlet-name<\/span>><\/span>\n<\/span><\/span>        <url-pattern<\/span>><\/span>*.xhtml<\/url-pattern<\/span>><\/span>\n<\/span><\/span>    <\/servlet-mapping<\/span>><\/span>\n<\/span><\/span><\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
FacesServlet needs to be mapped to *.xhtml<\/code>. All xhtml<\/code> pages should reside inside WEB-INF\/views<\/code> folder inside the web application, where the MVC framework searches for view files.<\/p>\n\n\n\n
UPDATE:<\/strong><\/p>\n\n\n\n
Alternatively, to turn on the same FacesServlet<\/code> apping as above, it is enough to place faces-config.xml<\/code> in WEB-INF<\/code> directory. In this case, the web.xml<\/code> file is not necessary. The file faces-config.xml<\/code> can be empty or can contain the simplest possible XML content like this:<\/p>\n\n\n
<?xml version='1.0' encoding='UTF-8'?><\/span>\n<faces-config<\/span> version<\/span>=\"2.2\"<\/span>\n              xmlns<\/span>=\"http:\/\/xmlns.jcp.org\/xml\/ns\/javaee\"<\/span>\n              xmlns:xsi<\/span>=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"<\/span>\n              xsi:schemaLocation<\/span>=\"http:\/\/xmlns.jcp.org\/xml\/ns\/javaee http:\/\/xmlns.jcp.org\/xml\/ns\/javaee\/web-facesconfig_2_2.xsd\"<\/span>><\/span>\n\n<\/faces-config<\/span>><\/span><\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
And that’s it! Now, you may start writing pages using facelets and reference them by path, which ends in xhtml<\/code>.<\/p>\n\n\n\n
An example Hello facelet page:<\/p>\n\n\n
<?xml version='1.0' encoding='UTF-8' ?><\/span>\n<!DOCTYPE html<\/span> PUBLIC<\/span> \"-\/\/W3C\/\/DTD XHTML 1.0 Transitional\/\/EN\"<\/span> \"http:\/\/www.w3.org\/TR\/xhtml1\/DTD\/xhtml1-transitional.dtd\"<\/span>><\/span>\n<html<\/span> xmlns<\/span>=\"http:\/\/www.w3.org\/1999\/xhtml\"<\/span>\n      xmlns:h<\/span>=\"http:\/\/xmlns.jcp.org\/jsf\/html\"<\/span>><\/span>\n    <h:head<\/span>><\/span>\n        <title<\/span>><\/span>Facelet Title<\/title<\/span>><\/span>\n    <\/h:head<\/span>><\/span>\n    <h:body<\/span>><\/span>\n        <h1<\/span>><\/span>#{hello}<\/h1<\/span>><\/span>\n    <\/h:body<\/span>><\/span>\n<\/html<\/span>><\/span>\n\n<\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
In order to display hello.xhtml<\/code>, just return \"hello.xhtml\"<\/code>` from the controller action as in one of the above examples and you’re done.<\/p>\n\n\n\n
Summary<\/h2>\n\n\n\n
Getting started with MVC framework is really easy once you understand basics of JAX-RS and CDI. The only requirement is to run your application on one of the application servers that support Ozark reference implementation. It is also very easy to use various view technologies as alternatives to default JSPs.<\/p>\n\n\n\n
MVC framework includes support for many view technologies and enables to plug in other technologies on top of it. Configuring Facelets required only to turn on the Faces servlet – the same thing you need to do when setting up JSF.<\/p>\n\n\n\n
\n\n\n\n
This post was inspired by another post by Bennet Schulz<\/a>. Visit his blog if you want to read more about the new MVC framework.<\/p>\n\n\n\n
An example source code is available on github<\/a>. An alternative configuration using faces-config.xml is demonstrated in the faces-config<\/a> branch.<\/p>\n","protected":false},"excerpt":{"rendered":"
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He's been developing in Java for over 10 years. He\u2019s worked for clients like Payara, LottoLand, Uniqa and others. He has co-founded OmniFish, where he works as a director and Jakarta EE expert. He\u2019s passionate about helping his clients and the wider Java community with their projects based on Jakarta EE and similar technologies. As an experienced Java developer and instructor, he's helped companies build and educate their development teams and improve their development processes. He's a core member of several opensource projects and Jakarta EE specification projects. He\u2019s a frequent conference speaker, leader of the Czech JUG and a Java Champion. Ondro is a regular conference speaker at international conferences. 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Second, unless you include beans.xml<\/code> with bean discovery mode<\/a> `all`, you need to mark your controller with a scope-defining annotation, like @RequestScoped<\/code>, to turn on CDI injection of Models<\/code> model.<\/p>\n\n\n\n