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POHow do I write a simple Servlet for Jetty using Eclipse?
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copied!<p>I downloaded Eclipse for Java EE and Jetty 8.1 and would like to implement a very simple Servlet.</p> <p>Jetty works fine when I start it using <code>java -jar start.jar</code>.</p> <p>To develop the Servlet I did this:</p> <ol> <li><p>In Eclipse, I choosed "New Dynamic Web Project".</p></li> <li><p>I added <code>jetty\lib\servlet-api-3.0.jar</code> to the "Build Path" in Eclipse.</p></li> <li><p>In that project, "New Servlet", and a Servlet was generated and I added some code:</p> <pre><code>/** * Servlet implementation class MyServlet */ @WebServlet("/MyServlet") public class MyServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); out.println("<html><body><h1>My Servlet</h1></body></html>"); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } } </code></pre></li> <li><p>I created a file <code>web.xml</code> in <code>WebContent\WEB-INF\web.xml</code> with this content:</p> <pre><code><?xml version="1.0" encoding="utf-8" ?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <servlet> <servlet-name>My Servlet</servlet-name> <servlet-class>MyServlet.class</servlet-class> </servlet> <servlet-mapping> <servlet-name>My Servlet</servlet-name> <url-pattern>/Servlet</url-pattern> </servlet-mapping> </code></pre> <p></p></li> <li><p>I copied the compiled <code>.class</code>-files in <code>build\classes</code> to <code>WebContent\WEB-INF\classes</code></p></li> <li><p>Now I choose to Export the project as a <code>.war</code>-file to <code>jetty\webapps\MySite.war</code>.</p></li> <li><p>I start Jetty with <code>java -jar start.jar</code> and visit <code>localhost:8080/MySite/Servlet</code> but now I get this message:</p> <pre><code>Servlet Not Initialized javax.servlet.UnavailableException: Servlet Not Initialized at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:546) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:485) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:483) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:412) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111) at org.eclipse.jetty.server.Server.handle(Server.java:351) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:451) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:916) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:647) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:233) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:76) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:615) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:45) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534) at java.lang.Thread.run(Thread.java:722) </code></pre></li> </ol> <p>and if I visit <code>localhost:8080/MySite/</code> I see two folders <code>WEB-INF\</code> and <code>META-INF\</code> both with size <code>0 bytes</code>.</p> <p>So it doesn't look like my <code>.war</code>-export in Eclipse worked.</p> <p>How do I export my simple Servlet for Jetty using Eclipse?</p> <hr> <p>I have now installed the <a href="http://wiki.eclipse.org/Jetty_WTP_Plugin" rel="noreferrer">Jetty WTP plugin</a> for Eclipse, but I can't run this servlet using it:</p> <pre><code>2012-01-30 10:06:50.322:INFO:oejs.Server:jetty-8.1.0.RC4 2012-01-30 10:06:50.353:INFO:oejdp.ScanningAppProvider:Deployment monitor C:\Users\Jonas\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\webapps at interval 1 2012-01-30 10:06:50.353:INFO:oejdp.ScanningAppProvider:Deployment monitor C:\Users\Jonas\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\contexts at interval 1 2012-01-30 10:06:50.353:INFO:oejd.DeploymentManager:Deployable added: C:\Users\Jonas\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\contexts\MySite.xml 2012-01-30 10:06:50.650:WARN:oejuc.AbstractLifeCycle:FAILED o.e.j.w.WebAppContext{/MySite,file:/C:/Users/Jonas/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/MySite/},C:\Users\Jonas\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0/wtpwebapps/MySite: java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor at org.eclipse.jetty.annotations.AnnotationConfiguration.createAnnotationParser(AnnotationConfiguration.java:111) at org.eclipse.jetty.annotations.AnnotationConfiguration.configure(AnnotationConfiguration.java:73) at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:428) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1208) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:699) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:454) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:36) at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:183) at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:491) at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:138) at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:142) at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:53) at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:604) at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:535) at org.eclipse.jetty.util.Scanner.scan(Scanner.java:398) at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:332) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:118) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:552) at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:227) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.util.component.AggregateLifeCycle.doStart(AggregateLifeCycle.java:58) at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:53) at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:91) at org.eclipse.jetty.server.Server.doStart(Server.java:263) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1214) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1137) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.jetty.start.Main.invokeMain(Main.java:457) at org.eclipse.jetty.start.Main.start(Main.java:600) at org.eclipse.jetty.start.Main.main(Main.java:82) Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.ClassVisitor at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.eclipse.jetty.annotations.AnnotationConfiguration.createAnnotationParser(AnnotationConfiguration.java:111) at org.eclipse.jetty.annotations.AnnotationConfiguration.configure(AnnotationConfiguration.java:73) at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:428) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1208) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:699) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:454) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:36) at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:183) at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:491) at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:138) at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:142) at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:53) at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:604) at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:535) at org.eclipse.jetty.util.Scanner.scan(Scanner.java:398) at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:332) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:118) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:552) at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:227) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.util.component.AggregateLifeCycle.doStart(AggregateLifeCycle.java:58) at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:53) at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:91) at org.eclipse.jetty.server.Server.doStart(Server.java:263) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59) at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1214) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1137) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.jetty.start.Main.invokeMain(Main.java:457) at org.eclipse.jetty.start.Main.start(Main.java:600) at org.eclipse.jetty.start.Main.main(Main.java:82) </code></pre>

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