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| <title>Using Annotations with Jetty Embedded</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty"><link rel="up" href="annotations.html" title="Chapter 13. Annotations"><link rel="prev" href="using-annotations.html" title="Working with Annotations"><link rel="next" href="jmx-chapter.html" title="Chapter 14. Java Management Extensions (JMX)"><link xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" rel="shortcut icon" href="images/favicon.ico"><link rel="stylesheet" href="css/highlighter/foundation.css"><script src="js/highlight.pack.js"></script><script> |
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| Version: 9.3.28.v20191105</span></td><td style="width: 50%"></td></tr></table><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Using Annotations with Jetty Embedded</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="using-annotations.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a> </td><th width="60%" align="center">Chapter 13. Annotations<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right"> <a accesskey="n" href="jmx-chapter.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at |
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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="using-annotations-embedded"></a>Using Annotations with Jetty Embedded</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="using-annotations-embedded.html#_setting_up_the_classpath_2">Setting up the Classpath</a></span></dt><dt><span class="section"><a href="using-annotations-embedded.html#_example">Example</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_setting_up_the_classpath_2"></a>Setting up the Classpath</h3></div></div></div><p>You will need to place the following Jetty jar files onto the classpath of your application. |
| You can obtain them from the <a class="link" href="http://download.eclipse.org/jetty/stable-9/dist/" target="_top">Jetty distribution</a>, or the <a class="link" href="http://central.maven.org/maven2/org/eclipse/jetty/jetty-annotations" target="_top">Maven repository</a>:</p><pre class="literallayout">jetty-plus.jar |
| jetty-annotations.jar</pre><p>You will also need the <a class="link" href="http://asm.ow2.org/" target="_top">asm</a> jar, which you can obtain from <a class="link" href="http://central.maven.org/maven2/org/eclipse/jetty/orbit/org.objectweb.asm/3.3.1.v201105211655/org.objectweb.asm-3.3.1.v201105211655.jar" target="_top">this link.</a></p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_example"></a>Example</h3></div></div></div><p>Here’s an example application that sets up a Jetty server, performs some setup to ensure that annotations are scanned, and then deploys a webapp that uses annotations. |
| This example also uses the @Resource annotation which involves JNDI, so we would also <a class="link" href="jndi-embedded.html" title="Using JNDI with Jetty Embedded">add the necessary JNDI jars to the classpath</a>. |
| The example also adds in the configuration classes that are responsible for JNDI (see line 19).</p><p>The code is as follows:</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>import org.eclipse.jetty.security.HashLoginService; |
| import org.eclipse.jetty.server.Server; |
| import org.eclipse.jetty.webapp.WebAppContext; |
| |
| /** |
| * ServerWithAnnotations |
| * |
| * |
| */ |
| public class ServerWithAnnotations |
| { |
| public static final void main(String args[]) throws Exception |
| { |
| //Create the server |
| Server server = new Server(8080); |
| |
| //Enable parsing of jndi-related parts of web.xml and jetty-env.xml |
| org.eclipse.jetty.webapp.Configuration.ClassList classlist = org.eclipse.jetty.webapp.Configuration.ClassList.setServerDefault(server); |
| classlist.addAfter("org.eclipse.jetty.webapp.FragmentConfiguration", "org.eclipse.jetty.plus.webapp.EnvConfiguration", "org.eclipse.jetty.plus.webapp.PlusConfiguration"); |
| classlist.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration", "org.eclipse.jetty.annotations.AnnotationConfiguration"); |
| |
| //Create a WebApp |
| WebAppContext webapp = new WebAppContext(); |
| webapp.setContextPath("/"); |
| webapp.setWar("../../tests/test-webapps/test-servlet-spec/test-spec-webapp/target/test-spec-webapp-9.0.4-SNAPSHOT.war"); |
| server.setHandler(webapp); |
| |
| //Register new transaction manager in JNDI |
| //At runtime, the webapp accesses this as java:comp/UserTransaction |
| org.eclipse.jetty.plus.jndi.Transaction transactionMgr = new org.eclipse.jetty.plus.jndi.Transaction(new com.acme.MockUserTransaction()); |
| |
| //Define an env entry with webapp scope. |
| org.eclipse.jetty.plus.jndi.EnvEntry maxAmount = new org.eclipse.jetty.plus.jndi.EnvEntry (webapp, "maxAmount", new Double(100), true); |
| |
| |
| // Register a mock DataSource scoped to the webapp |
| org.eclipse.jetty.plus.jndi.Resource mydatasource = new org.eclipse.jetty.plus.jndi.Resource(webapp, "jdbc/mydatasource", new com.acme.MockDataSource()); |
| |
| // Configure a LoginService |
| HashLoginService loginService = new HashLoginService(); |
| loginService.setName("Test Realm"); |
| loginService.setConfig("src/test/resources/realm.properties"); |
| server.addBean(loginService); |
| |
| |
| server.start(); |
| server.join(); |
| } |
| |
| }</code></pre><p>On line 19 the configuration classes responsible for setting up JNDI and <code class="literal">java:comp/env</code> are added.</p><p>On line 20 we add in the configuration class that ensures annotations are inspected.</p><p>On lines 30, 33 and 37 JNDI resources that we will be able to reference with @Resource annotations are configured.</p><p>With the setup above, a servlet that uses annotations and Jetty will honour the annotations when the webapp is deployed can be created:</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>import javax.annotation.security.DeclareRoles; |
| import javax.annotation.security.RunAs; |
| import javax.servlet.ServletConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletOutputStream; |
| import javax.servlet.annotation.WebInitParam; |
| import javax.servlet.annotation.WebServlet; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.sql.DataSource; |
| import javax.transaction.UserTransaction; |
| |
| /** |
| * AnnotationTest |
| * |
| * Use servlet 3.0 annotations from within Jetty. |
| * |
| * Also uses servlet 2.5 resource injection and lifecycle callbacks |
| */ |
| |
| @RunAs("special") |
| @WebServlet(urlPatterns = {"/","/test/*"}, name="AnnotationTest", initParams={@WebInitParam(name="fromAnnotation", value="xyz")}) |
| @DeclareRoles({"user","client"}) |
| public class AnnotationTest extends HttpServlet |
| { |
| private DataSource myDS; |
| |
| @Resource(mappedName="UserTransaction") |
| private UserTransaction myUserTransaction; |
| |
| @Resource(mappedName="maxAmount") |
| private Double maxAmount; |
| |
| |
| @Resource(mappedName="jdbc/mydatasource") |
| public void setMyDatasource(DataSource ds) |
| { |
| myDS=ds; |
| } |
| |
| |
| @PostConstruct |
| private void myPostConstructMethod () |
| { |
| System.err.println("PostConstruct called"); |
| } |
| |
| |
| @PreDestroy |
| private void myPreDestroyMethod() |
| { |
| System.err.println("PreDestroy called"); |
| } |
| |
| public void init(ServletConfig config) throws ServletException |
| { |
| super.init(config); |
| } |
| |
| |
| public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException |
| { |
| doGet(request, response); |
| } |
| |
| public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException |
| { |
| try |
| { |
| response.setContentType("text/html"); |
| ServletOutputStream out = response.getOutputStream(); |
| out.println("<html>"); |
| out.println("<body>"); |
| out.println("<h1>Results</h1>"); |
| out.println(myDS.toString()); |
| out.println("<br/>"); |
| out.println(maxAmount.toString()); |
| out.println("</body>"); |
| out.println("</html>"); |
| out.flush(); |
| } |
| catch (Exception e) |
| { |
| throw new ServletException(e); |
| } |
| } |
| }</code></pre></div></div><script type="text/javascript"> |
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