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Getting_Started_Developing_Applications_Guide.html
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</head>
<body id="Getting_Started_Developing_Applications_Guide" class="book toc2 toc-left">
<div id="header">
<h1>Getting Started Developing Applications Guide</h1>
<div class="details">
<span id="author" class="author">WildFly team</span><br>
<span id="revnumber">version 27.0.0.Final,</span>
<span id="revdate">2022-11-11T14:25:14Z</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Getting Started Developing Applications Guide</div>
<ul class="sectlevel1">
<li><a href="#introduction">1. Introduction</a>
<ul class="sectlevel2">
<li><a href="#downloading-the-quickstarts">1.1. Downloading the quickstarts</a></li>
</ul>
</li>
<li><a href="#getting-started-with-wildfly">2. Getting started with WildFly</a>
<ul class="sectlevel2">
<li><a href="#installing-and-starting-the-jboss-server-on-linux-unix-or-mac-os-x">2.1. Installing and starting the JBoss server on Linux, Unix or Mac OS X</a></li>
<li><a href="#installing-and-starting-the-jboss-server-on-windows">2.2. Installing and starting the JBoss server on Windows</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>© 2017 The original authors.</p>
</div>
<!-- toc disabled -->
<div class="paragraph">
<p>This guide has moved to
<a href="https://github.com/wildfly/quickstart/blob/27.x/guide/" class="bare">https://github.com/wildfly/quickstart/blob/27.x/guide/</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="introduction"><a class="anchor" href="#introduction"></a>1. Introduction</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This guide will walk you through installing and starting up JBoss WildFly. It will then introduce key features of the Jakarta EE (Web Profile) programming model, of which JBoss WildFly is a certified implementation.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="title">Jakarta EE</div>
<div class="paragraph">
<p>The Jakarta EE platform offers developers the ability to write
distributed, transactional and portable applications quickly and easily.
We class applications that require these capabilities "enterprise
applications". These applications must be fast, secure and reliable.</p>
</div>
<div class="paragraph">
<p>Jakarta EE has always offered strong messaging (JMS), transactional (JTA)
and resource (JCA) capabilities as well as exposing web services via
SOAP (JAX-WS).</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>JBoss WildFly depart from the familiar structure of previous JBoss AS versions, so we recommend all developers follow the steps in <a href="https://github.com/wildfly/quickstart/blob/10.x/guide/GettingStarted.asciidoc">Getting Started with JBoss WildFly</a> to install and start up the application server for the first time.</p>
</div>
<div class="paragraph">
<p>JBoss WildFly come with a series of quickstarts aimed to get you up to writing applications with minimal fuss. We recommend to start by working through the quickstarts in this guide, in the order they are presented. If you have previous experience with Jakarta EE 6, you may wish to skip some or all of the quickstarts.</p>
</div>
<div class="paragraph">
<p><strong>Core</strong></p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p><a href="https://github.com/wildfly/quickstart/blob/10.x/guide/HelloworldQuickstart.asciidoc">Helloworld Quickstart</a>. If you have previously developed applications using technologies such as JSF or Wicket, and EJB or Spring, you may wish to skip this quickstart.</p>
</li>
<li>
<p><a href="https://github.com/wildfly/quickstart/blob/10.x/guide/NumberguessQuickstart.asciidoc">Numberguess Quickstart</a>. If you have previously developed applications using technologies such as JSF or Wicket, EJB or Spring, and JPA or Hibernate you may wish to skip this quickstart.</p>
</li>
<li>
<p><a href="https://github.com/wildfly/quickstart/blob/10.x/guide/GreeterQuickstart.asciidoc">Greeter Quickstart</a>. If you are a Jakarta EE wizard you may wish to skip this quickstart.</p>
</li>
<li>
<p><a href="https://github.com/wildfly/quickstart/blob/10.x/guide/KitchensinkQuickstart.asciidoc">Kitchensink Quickstart</a>. A great starting point for your project.</p>
</li>
</ol>
</div>
<div class="sect2">
<h3 id="downloading-the-quickstarts"><a class="anchor" href="#downloading-the-quickstarts"></a>1.1. Downloading the quickstarts</h3>
<div class="paragraph">
<p>The quickstarts are are available for download from <a href="https://github.com/wildfly/quickstart">JBoss Developer Framework</a>. Make sure you download the latest zip!</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="getting-started-with-wildfly"><a class="anchor" href="#getting-started-with-wildfly"></a>2. Getting started with WildFly</h2>
<div class="sectionbody">
<div id="GettingStarted-" class="paragraph">
<p>To run the quickstarts with the provided build scripts, you’ll need:</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>If you already have any of these pieces of software, there is no need to
install them again!</p>
</div>
</td>
</tr>
</table>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Java 8, to run WildFly and Maven</dt>
<dd>
<p>Choose your Java runtime, and follow their installation instructions. For example, you could choose one of:</p>
<div class="ulist">
<ul>
<li>
<p><a href="http://openjdk.java.net/install/">OpenJDK</a></p>
</li>
<li>
<p><a href="http://www.oracle.com/technetwork/java/javase/index-137561.html">Oracle Java SE</a></p>
</li>
</ul>
</div>
</dd>
<dt class="hdlist1">Maven 3, to build and deploy the quickstarts</dt>
<dd>
<p>Follow the official Maven installation guide if you don’t already have Maven 3 installed. You can check which version of Maven you have installed (if any) by running <code>mvn --version</code> . If you see a version newer than 3.0.0, you are ready to go.</p>
</dd>
<dt class="hdlist1">The JBoss WildFly runtime</dt>
<dd>
<p>Download JBoss WildFly from the <a href="http://wildfly.org/downloads/">WildFly download page</a></p>
</dd>
<dt class="hdlist1">The WildFly quickstarts</dt>
<dd>
<p>Available from <a href="https://github.com/wildfly/quickstart">WildFly Quickstarts</a></p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>If you wish to use the examples from an IDE, we recommend using CodeReady Studio, or Eclipse with JBoss Tools.</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">Red Hat CodeReady Studio</dt>
<dd>
<p>Download CodeReady Studio from <a href="https://developers.redhat.com/products/codeready-studio/download" class="bare">https://developers.redhat.com/products/codeready-studio/download</a>.</p>
</dd>
<dt class="hdlist1">Eclipse, with JBoss Tools</dt>
<dd>
<p>Download JBoss Tools from <a href="http://jboss.org/tools" class="bare">http://jboss.org/tools</a>. Make sure you install m2eclipse as well.</p>
</dd>
</dl>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>JBoss WildFly offer the
ability to manage multiple AS instances from a single control point.
A collection of such servers are referred to as members of a "domain",
with a single Domain Controller process acting as the management control
point. Domains can span multiple physical (or virtual) machines, with
all AS instances on a given host under the control of a Host Controller
process. The Host Controllers interact with the Domain Controller to
control the lifecycle of the AS instances running on that host and to
assist the Domain Controller in managing them.</p>
</div>
<div class="paragraph">
<p>JBoss WildFly also offers a standalone mode, which is perfect for a single
server. We use this throughout the quickstarts.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="sect2">
<h3 id="installing-and-starting-the-jboss-server-on-linux-unix-or-mac-os-x"><a class="anchor" href="#installing-and-starting-the-jboss-server-on-linux-unix-or-mac-os-x"></a>2.1. Installing and starting the JBoss server on Linux, Unix or Mac OS X</h3>
<div id="GettingStarted-on_linux" class="paragraph">
<p>First, let’s verify that both Java and Maven are correctly
installed. In a console, type:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>java -version</pre>
</div>
</div>
<div class="paragraph">
<p>You should see a version string (at least <code>1.8.0</code>) printed. If not, contact your provider of Java for assistance. Next, type:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>mvn --version</pre>
</div>
</div>
<div class="paragraph">
<p>You should see a version string (at least <code>3.3.0</code>) printed. If not, contact the Maven community for assistance.</p>
</div>
<div class="paragraph">
<p>Next, we need to choose a location for WildFly to live. By default, WildFly will be extracted into <code>wildfly-11.x.x.x</code> (where <code>11.x.x.x</code> matches the version you downloaded):</p>
</div>
<div class="literalblock">
<div class="content">
<pre>unzip wildfly-11.x.x.x.zip</pre>
</div>
</div>
<div class="paragraph">
<p>Now, let’s start WildFly in standalone mode:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>wildfly-11.x.x.x/bin/standalone.sh</pre>
</div>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>If you want to stop WildFly, simply press Crtl-C whilst the terminal
has focus.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>That’s it, WildFly is installed and running! Visit <a href="http://localhost:8080/" class="bare">http://localhost:8080/</a> to check the server has started properly.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>You can find the server log for standalone instances in
<code>wildfly-11.x.x.x/standalone/log/server.log</code>. The
<a href="http://docs.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/7/html/Administration_and_Configuration_Guide/index.html">Administration and Configuration Guide for JBoss Enterprise Application Platform 7</a> or the
<a href="https://docs.jboss.org/author/display/AS71/Getting+Started+Guide">Getting Started Guide for JBoss WildFly</a>
covers more on configuring logging.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="installing-and-starting-the-jboss-server-on-windows"><a class="anchor" href="#installing-and-starting-the-jboss-server-on-windows"></a>2.2. Installing and starting the JBoss server on Windows</h3>
<div id="GettingStarted-on_windows" class="paragraph">
<p>First, let’s verify that both Java and Maven are correctly installed. In a Command Prompt, type:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>java -version</pre>
</div>
</div>
<div class="paragraph">
<p>You should see a version string (at least <code>1.8.0</code>) printed. If not, contact your provider of Java for assistance. Next, type:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>mvn --version</pre>
</div>
</div>
<div class="paragraph">
<p>You should see a version string (at least <code>3.3.0</code>) printed. If not, contact the Maven community for assistance.</p>
</div>
<div class="paragraph">
<p>Next, we need to choose a location for JBoss WildFly to live. By default, JBoss WildFly will be extracted into <code>wildfly-11.x.x.x</code> (where <code>11.x.x.x</code> matches the version you downloaded). Unzip JBoss Enterprise Application Platform or JBoss WildFly using your tool of choice.</p>
</div>
<div class="paragraph">
<p>Finally, let’s start JBoss WildFly in standalone mode. Locate your installation and run <code>standalone.bat</code> located in <code>bin</code>.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>If you want to stop the server, simply press Crtl-C whilst the terminal
has focus.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>That’s it, JBoss WildFly is installed and running! Visit <a href="http://localhost:8080/" class="bare">http://localhost:8080/</a> to check the server has started properly.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>You can find the server log for standalone instances in
<code>wildfly-11.x.x.x/standalone/log/server.log</code>. The
<a href="http://docs.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/7/html/Administration_and_Configuration_Guide/index.html">Administration and Configuration Guide for JBoss Enterprise Application Platform 7</a> or the
<a href="https://docs.jboss.org/author/display/WFLY/Getting+Started+Guide">Getting Started Guide for JBoss WildFly</a>
covers more on configuring logging.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Starting the JBoss server from CodeReady Studio or Eclipse with JBoss Tools</p>
</div>
<div class="listingblock">
<div class="content">
<pre>[[GettingStarted-with_jboss_tools]]
You may choose to use CodeReady Studio, or Eclipse with JBoss Tools, rather than the command line to run JBoss WildFly, and to deploy the quickstarts. If you don't wish to use Eclipse, you should skip this section.
Make sure you have installed and started CodeReady Studio or Eclipse. First, we need to add our WildFly instance to it. First, navigate to _Preferences_:
image:gfx/Eclipse_Detect_Servers_1.png[]
Now, locate the _JBoss Tools Runtime Detection_ preferences:
image:gfx/Eclipse_Detect_Servers_2.png[]
Click _Add_ and locate where you put servers on your disk:
image:gfx/Eclipse_Detect_Servers_3.png[]
Any available servers will be located, now all you need to do is click _OK_, and then _OK_ on the preferences dialog:
image:gfx/Eclipse_Detect_Servers_4.png[]
Now, let's start the server from Eclipse. If you previously started a server from the command line, you should stop it there first.
First, we need to make sure the Server tab is on view. Open the _Window -> Show View -> Other..._ dialog:
image:gfx/Eclipse_Server_Tab_1.jpg[]
And select the Server view:
image:gfx/Eclipse_Server_Tab_2.jpg[]
You should see the Server View appear with the detected servers:
image:gfx/Eclipse_Server_Tab_3.jpg[]
Now, we can start the server. Right click on the server in the Server view, and select Start :
image:gfx/Eclipse_Server_Start_1.jpg[]
[TIP]
========================================================================
If you want to debug your application, you can simply select Debug
rather than Start . This will start the server in debug mode, and
automatically attach the Eclipse debugger.
========================================================================
You'll see the server output in the Console :
image:gfx/Eclipse_Server_Start_2.jpg[]
That's it, we now have the server up and running in Eclipse!
Importing the quickstarts into Eclipse
--------------------------------------
[[GettingStarted-importing_quickstarts_into_eclipse]]
In order to import the quickstarts into Eclipse, you will need m2eclipse installed. If you have CodeReady Studio, then m2eclipse is already installed.
First, choose _File -> Import..._:
image:gfx/Import_Quickstarts_1.jpg[]
Select _Existing Maven Projects_:
image:gfx/Import_Quickstarts_2.jpg[]
Click on _Browse_, and navigate to the `quickstarts/` directory:
image:gfx/Import_Quickstarts_3.jpg[]
Finally, make sure all 4 quickstarts are found and selected, and click _Finish_:
image:gfx/Import_Quickstarts_4.jpg[]
Eclipse should now successfully import 4 projects:
image:gfx/Import_Quickstarts_5.jpg[]
It will take a short time to import the projects, as Maven needs to download the project's dependencies from remote repositories.
Managing JBoss WildFly
----------------------
Here we will quickly outline how you can access both the command line interface and the web management interface for managing JBoss WildFly. Detailed information for both can be found in the link:http://docs.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/6/html/Administration_and_Configuration_Guide/index.html[Administration and Configuration Guide for JBoss Enterprise Application Platform 6] or the link:https://docs.jboss.org/author/display/WFLY/Admin+Guide[Admin Guide for JBoss WildFly].
When the server is running, the web management interface can be accessed at http://localhost:9990/console. You can use the web management interface to create datasources, manage deployments and configure the server.
JBoss WildFly also comes with a command line interface. To run it on Linux, Unix or Mac, execute:
wildfly-11.x.x.x/bin/jboss-admin.sh --connect
Or, on Windows:
wildfly-11.x.x.x/bin/jboss-admin.bat --connect
Once started, type help to discover the commands available to you.
Throughout this guide we use the `wildfly` maven plugin to deploy and undeploy applications. This plugin uses the Native Java Detyped Management API to communicate with the server. The Detyped API is used by management tools to control an entire domain of servers, and exposes only a small number of types, allowing for backwards and forwards compatibility.
CDI + Servlet: Helloworld quickstart
====================================
:Author: Pete Muir
[[HelloworldQuickstart-]]
This quickstart shows you how to deploy a simple servlet to JBoss WildFly. The business logic is encapsulated in a service, which is provided as a CDI bean, and injected into the Servlet.
[TIP]
.Contexts and Dependency Injection for Jakarta EE
========================================================================
CDI is a specification in Jakarta EE, inspired by JBoss Seam and
Google Guice, and also drawing on lessons learned from frameworks such
as Spring. It allows application developers to concentrate on developing
their application logic by providing the ability to wire services
together, and abstract out orthogonal concerns, all in a type safe
manner.
========================================================================
Switch to the `quickstarts/helloworld` directory and instruct Maven to build and deploy the application:
mvn package wildfly:deploy
The quickstart uses a Maven plugin to deploy the application. The plugin requires JBoss WildFly to be running (you can find out how to start the server in <<GettingStarted-on_linux, Installing and starting the JBoss server on Linux, Unix or Mac OS X>> or <<GettingStarted-on_windows, Installing and starting the JBoss server on Windows>>).
Now, check if the application has deployed properly by clicking http://localhost:8080/wildfly-helloworld/HelloWorld. If you see a "Hello World" message it's all working!
[TIP]
========================================================================
Should you wish to undeploy the quickstart, or redeploy after making
some changes, it's pretty easy:
* `mvn wildfly:deploy` - deploy any changes to the application to the
application server
* `mvn wildfly:undeploy` - undeploy the quickstart
========================================================================
It's time to pull the covers back and dive into the internals of the quickstart.
Deploying the Helloworld quickstart using CodeReady Studio, or Eclipse with JBoss Tools
---------------------------------------------------------------------------------------------
You may choose to deploy the quickstart using CodeReady Studio, or Eclipse with JBoss Tools. You'll need to have JBoss WildFly started in the IDE (as described in <<GettingStarted-with_jboss_tools, Starting the JBoss server from JBDS or Eclipse with JBoss Tools>>) and to have imported the quickstarts into Eclipse (as described in <<GettingStarted-importing_quickstarts_into_eclipse,Importing the quickstarts into Eclipse>>).
With the quickstarts imported, you can deploy the quickstart by right clicking on the `wildfly-helloworld` project, and choosing _Run As -> Run On Server_:
image:gfx/Eclipse_Helloworld_Deploy_1.jpg[]
Make sure the correct server is selected, and hit Finish:
image:gfx/Eclipse_Deploy_2.jpg[]
You should see the server start up (unless you already started it in <<GettingStarted-with_jboss_tools, Starting the JBoss server from JBDS or Eclipse with JBoss Tools>>) and the application deploy in the Console log
image:gfx/Eclipse_Helloworld_Deploy_3.jpg[]
The helloworld quickstart in depth
----------------------------------
The quickstart is very simple - all it does is print "Hello World" onto a web page.
The helloworld quickstart is comprised of a servlet and a CDI bean. We also include an empty `beans.xml` file, which tells JBoss WildFly to look for beans in this application and to activate the CDI. `beans.xml` is located in `WEB-INF/`, which can be found in the `src/main/webapp` directory. Also in this directory we include `index.html` which uses a simple meta refresh to send the users browser to the Servlet, which is located at http://localhost:8080/wildfly-helloworld/HelloWorld.
All the configuration files for this quickstart are located in `WEB-INF/`, which can be found in the `src/main/webapp` directory.
Notice that we don't even need a `web.xml`!
Let's start by taking a look at the servlet:
.src/main/java/org/jboss/as/quickstarts/helloworld/HelloWorldServlet.java
[source,java]
------------------------------------------------------------------------
@SuppressWarnings("serial")
@WebServlet("/HelloWorld") <i class="conum" data-value="1"></i><b>(1)</b>
public class HelloWorldServlet extends HttpServlet {
static String PAGE_HEADER =
"<html><head><title>helloworld</title></head><body>"; <i class="conum" data-value="2"></i><b>(2)</b>
static String PAGE_FOOTER = "</body></html>";
@Inject
HelloService helloService; <i class="conum" data-value="3"></i><b>(3)</b>
@Override
protected void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html");
PrintWriter writer = resp.getWriter();
writer.println(PAGE_HEADER);
writer.println("<h1>" +
helloService.createHelloMessage("World") + <i class="conum" data-value="4"></i><b>(4)</b>
"</h1>");
writer.println(PAGE_FOOTER);
writer.close();
}
}
------------------------------------------------------------------------
<1> If you've used Servlet before, then you'll remember having to use xml to register your servlets. Fortunately, this is a thing of the past. Now all you need to do is add the @WebServlet annotation, and provide a mapping to a URL used to access the servlet. Much cleaner!
<2> Every web page needs to be correctly formed HTML. We've created static Strings to hold the minimum header and footer to write out.
<3> We inject the HelloService (a CDI bean) which generates the actual message. This allows to alter the implementation of HelloService at a later date without changing the view layer at all (assuming we don't alter the API of HelloService ).
<4> We call into the service to generate the message "Hello World", and write it out to the HTTP request.
[TIP]
========================================================================
The package declaration and imports have been excluded from these
listings. The complete listing is available in the quickstart source.
========================================================================
Now we understand how the information is sent to the browser, let's take a look at the service.
.src/main/java/org/jboss/as/quickstarts/helloworld/HelloService.java
------------------------------------------------------------------------
public class HelloService {
String createHelloMessage(String name) {
return "Hello " + name + "!";
}
}
------------------------------------------------------------------------