[jetty-users] ClassNotFoundException: org.eclipse.jetty.websocket.server

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[jetty-users] ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketServerFactory

From: Alexander Farber <alexander.farber@xxxxxxxxx>
Date: Fri, 27 May 2016 12:36:06 +0200
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Hello,

I am trying to follow few Jetty 9 websocket tutorials ( like https://webtide.com/jetty-9-updated-websocket-api/ ) and run embedded Jetty with a custom WebSocketListener.

1) https://github.com/afarber/jetty-newbie/blob/master/EmbeddedWebsocket/src/main/java/de/afarber/MyListener.java -

package de.afarber;

import org.eclipse.jetty.websocket.api.Session;

import org.eclipse.jetty.websocket.api.WebSocketListener;

/**

* Example EchoSocket using Listener.

public class MyListener implements WebSocketListener {

private Session mSession;

@Override

public void onWebSocketBinary(byte[] payload, int offset, int len) {

/* only interested in text messages */

}

@Override

public void onWebSocketClose(int statusCode, String reason) {

mSession = null;

}

@Override

public void onWebSocketConnect(Session session) {

mSession = session;

}

@Override

public void onWebSocketError(Throwable cause) {

cause.printStackTrace(System.err);

}

@Override

public void onWebSocketText(String message) {

if (mSession != null && mSession.isOpen()) {

System.out.printf("Echoing back message [%s]%n",message);

mSession.getRemote().sendString(message,null);

}

2) https://github.com/afarber/jetty-newbie/blob/master/EmbeddedWebsocket/src/main/java/de/afarber/MyServlet.java -

package de.afarber;

import org.eclipse.jetty.server.Server;

import org.eclipse.jetty.servlet.ServletContextHandler;

import org.eclipse.jetty.websocket.servlet.WebSocketServlet;

import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory;

public class MyServlet extends WebSocketServlet {

public static void main(String[] args) throws Exception {

Server server = new Server(8080);

ServletContextHandler context = new ServletContextHandler();

context.addServlet(MyServlet.class, "/");

server.setHandler(context);

server.start();

server.join();

}

@Override

public void configure(WebSocketServletFactory factory) {

factory.register(MyListener.class);

}

3) I don't use Jetty Maven Plugin in my https://github.com/afarber/jetty-newbie/blob/master/EmbeddedWebsocket/pom.xml -

because as I have understood, the Jetty Maven Plugin starts Jetty (with "mvn jetty:run") which then scans the webapps dir for war-files - while I want to start "embedded Jetty", which only serves Websocket requests (and add JDBC connection to my PostgreSQL database later):

<project xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<groupId>de.afarber</groupId>

<artifactId>embedded-websocket</artifactId>

<version>0.1-SNAPSHOT</version>

<name>Embedded Websocket</name>

</properties>

<groupId>org.eclipse.jetty</groupId>

<artifactId>jetty-server</artifactId>

<version>${jettyVersion}</version>

</dependency>

<groupId>org.eclipse.jetty</groupId>

<artifactId>jetty-servlet</artifactId>

<version>${jettyVersion}</version>

</dependency>

<groupId>org.eclipse.jetty.websocket</groupId>

<artifactId>websocket-api</artifactId>

<version>${jettyVersion}</version>

</dependency>

<groupId>org.eclipse.jetty.websocket</groupId>

<artifactId>websocket-servlet</artifactId>

<version>${jettyVersion}</version>

</dependency>

</dependencies>

</project>

Also I think that at my production server (with CentOS 7 Linux) I shouldn't use Maven to start the production Jetty...

So I have opened my project with the above 3 files in NetBeans and run it.

Then I have copied the parameters it uses to start the "embedded Jetty" to command line of my Macbook:

# /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java -cp /Users/afarber/src/jetty-newbie/EmbeddedWebsocket/target/classes:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-server/9.3.9.v20160517/jetty-server-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/javax/servlet/javax.servlet-api/3.1.0/javax.servlet-api-3.1.0.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-http/9.3.9.v20160517/jetty-http-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-util/9.3.9.v20160517/jetty-util-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-io/9.3.9.v20160517/jetty-io-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-servlet/9.3.9.v20160517/jetty-servlet-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/jetty-security/9.3.9.v20160517/jetty-security-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/websocket/websocket-api/9.3.9.v20160517/websocket-api-9.3.9.v20160517.jar:/Users/afarber/.m2/repository/org/eclipse/jetty/websocket/websocket-servlet/9.3.9.v20160517/websocket-servlet-9.3.9.v20160517.jar de.afarber.MyServlet

2016-05-27 12:32:40.742:INFO::main: Logging initialized @191ms

2016-05-27 12:32:40.831:INFO:oejs.Server:main: jetty-9.3.9.v20160517

2016-05-27 12:32:40.867:INFO:oejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@2a33fae0{/,null,AVAILABLE}

2016-05-27 12:32:40.908:INFO:oejs.AbstractConnector:main: Started ServerConnector@277c0f21{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}

2016-05-27 12:32:40.909:INFO:oejs.Server:main: Started @361ms

So far so good, but when I try to open http://localhost:8080 I get the exception:

2016-05-27 12:33:32.632:WARN:/:qtp1880587981-12: unavailable

java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketServerFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.eclipse.jetty.websocket.servlet.WebSocketServletFactory$Loader.load(WebSocketServletFactory.java:66)

at org.eclipse.jetty.websocket.servlet.WebSocketServletFactory$Loader.create(WebSocketServletFactory.java:44)

at org.eclipse.jetty.websocket.servlet.WebSocketServlet.init(WebSocketServlet.java:130)

at javax.servlet.GenericServlet.init(GenericServlet.java:244)

at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:640)

at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:496)

at org.eclipse.jetty.servlet.ServletHolder.ensureInstance(ServletHolder.java:788)

at org.eclipse.jetty.servlet.ServletHolder.prepare(ServletHolder.java:773)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:578)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1174)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)

at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1106)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)

at org.eclipse.jetty.server.Server.handle(Server.java:524)

at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:319)

at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:253)

at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)

at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)

at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)

at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)

at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)

at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)

at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)

at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)

at java.lang.Thread.run(Thread.java:745)

2016-05-27 12:33:32.633:WARN:oejs.ServletHandler:qtp1880587981-12:

javax.servlet.ServletException: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.server.WebSocketServerFactory

at org.eclipse.jetty.websocket.servlet.WebSocketServlet.init(WebSocketServlet.java:142)