Websocket JSR-356 fail with Jetty 9.4.1

Question

My current web server is embedded Jetty 9.1.5. It works well with JSR-356 to create websocket. These days, I am trying to upgrade to Jetty 9.4.1. Everything works nicely except websocket.
My code like below:

Embedded Jetty and Websocket libs:

<dependency>
   <groupId>org.eclipse.jetty</groupId>
   <artifactId>jetty-server</artifactId>
   <version>9.4.1.v20170120</version>
</dependency>
<dependency>
   <groupId>org.eclipse.jetty</groupId>
   <artifactId>jetty-webapp</artifactId>
   <version>9.4.1.v20170120</version>
</dependency>
<dependency>
   <groupId>org.eclipse.jetty</groupId>
   <artifactId>jetty-annotations</artifactId>
   <version>9.4.1.v20170120</version>
</dependency>
<dependency>
   <groupId>org.eclipse.jetty.websocket</groupId>
   <artifactId>javax-websocket-server-impl</artifactId>
   <version>9.4.1.v20170120</version>
</dependency>

Server endpoint:

  @ServerEndpoint(value = "/ws/communication/{officeId}/{username}/{oldWSSession}")
  class WSCommunication {
     // @OnOpen, @OnMessage, @OnClose methods
  }

Jetty server, Webapp context, Websocket configuration:

  // Jetty server
  Server server = new Server();
  String[] configFiles = {"./etc/jetty.xml"};
  for (String configFile : configFiles) {
     XmlConfiguration configuration = new XmlConfiguration(new File(configFile).toURI().toURL());
     configuration.configure(server);

     Connector[] connectors =  server.getConnectors();
     if (connectors != null && connectors.length == 2) {
        ServerConnector serverConnector = (ServerConnector) connectors[1];
        serverConnector.setPort(8443);
     }
   }

   // Webapp context
   WebAppContext webContext = new WebAppContext(ResourceManager.getWebappsPath(), "/myContext");
   webContext.setContextPath("/myContext");
   webContext.setResourceBase(ResourceManager.getWebappsPath() + contextPath);
   webContext.setInitParameter("org.eclipse.jetty.servlet.Default.dirAllowed", "false");

   private List<WebAppContext> listWebContext = new ArrayList<>();
   listWebContext.add(webContext);

   ContextHandlerCollection contexts = new ContextHandlerCollection();
   contexts.setHandlers(listWebContext.toArray(new WebAppContext[listWebContext.size()]));
   server.setHandler(contexts);

   // Start server
   server.start();

   // Websocket
   ServerContainer container =
   WebSocketServerContainerInitializer.configureContext(webContext);
   container.addEndpoint(webContext.getClassLoader().loadClass(
                         "com.example.WSCommunication"));

   container.setDefaultMaxSessionIdleTimeout(84600);

   // Dump server log
   server.dumpStdErr();

Dump:

 org.eclipse.jetty.server.Server@5ca13457 - STARTED
       += qtp348159759{STARTED,10<=19<=200,i=1,q=0} - STARTED
       |   +- 30 qtp348159759-30 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 31 qtp348159759-31-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 89 qtp348159759-89-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 85 qtp348159759-85-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 33 qtp348159759-33-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 36 qtp348159759-36 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 35 qtp348159759-35-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 90 qtp348159759-90-acceptor-0@6a934d20-ServerConnector@31de14e{SSL,[ssl, http/1.1]}{0.0.0.0:8443} RUNNABLE @ sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) prio=3
       |   +- 84 qtp348159759-84 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 86 qtp348159759-86 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 38 qtp348159759-38-acceptor-0@21398b5e-ServerConnector@52bab8e{HTTP/1.1,[http/1.1]}{0.0.0.0:8080} RUNNABLE @ sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) prio=3
       |   +- 87 qtp348159759-87-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 92 qtp348159759-92 TIMED_WAITING @ sun.misc.Unsafe.park(Native Method) IDLE
       |   +- 32 qtp348159759-32 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 34 qtp348159759-34 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 88 qtp348159759-88 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 39 qtp348159759-39 RUNNABLE @ sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
  |   +- 37 qtp348159759-37-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- 83 qtp348159759-83-lowPrioritySelector BLOCKED @ org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:244) prio=1
       |   +- jobs
       += org.eclipse.jetty.util.thread.ScheduledExecutorScheduler@1ca4b0fd - STARTED
       |   +- sun.misc.Unsafe.park(Native Method)
       |   +- java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
       |   +- java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
       |   +- java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
       |   +- java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
       |   +- java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
       |   +- java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
       |   +- java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
       |   +- java.lang.Thread.run(Thread.java:745)
       += ServerConnector@52bab8e{HTTP/1.1,[http/1.1]}{0.0.0.0:8080} - STARTED
       |   +~ org.eclipse.jetty.server.Server@5ca13457 - STARTED
       |   +~ qtp348159759{STARTED,10<=19<=200,i=1,q=0} - STARTED
       |   +~ org.eclipse.jetty.util.thread.ScheduledExecutorScheduler@1ca4b0fd - STARTED
       |   +- org.eclipse.jetty.io.ArrayByteBufferPool@4f751fc9
       |   += HttpConnectionFactory@30bf9c09[HTTP/1.1] - STARTED
       |   |   +- HttpConfiguration@248e9950{32768/8192,8192/8192,https://:8443,[]}
       |   += org.eclipse.jetty.server.ServerConnector$ServerConnectorManager@282048ea - STARTED
       |   |   += org.eclipse.jetty.io.ManagedSelector@65c05e53 id=0 keys=0 selected=0 id=0
       |   |   |   +- sun.nio.ch.KQueueSelectorImpl@6724bccb keys=0
       |   |   += org.eclipse.jetty.io.ManagedSelector@1fa04d47 id=1 keys=0 selected=0 id=1
       |   |   |   +- sun.nio.ch.KQueueSelectorImpl@5fcb5753 keys=0
       |   |   += org.eclipse.jetty.io.ManagedSelector@7999a7f0 id=2 keys=0 selected=0 id=2
       |   |   |   +- sun.nio.ch.KQueueSelectorImpl@3abe8266 keys=0
       |   |   += org.eclipse.jetty.io.ManagedSelector@6d2e80a1 id=3 keys=0 selected=0 id=3
       |   |       +- sun.nio.ch.KQueueSelectorImpl@2e5f2aae keys=0
       |   +- sun.nio.ch.ServerSocketChannelImpl[/0:0:0:0:0:0:0:0:8080]
       |   +- qtp348159759-38-acceptor-0@21398b5e-ServerConnector@52bab8e{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
       += ServerConnector@31de14e{SSL,[ssl, http/1.1]}{0.0.0.0:8443} - STARTED
       |   +~ org.eclipse.jetty.server.Server@5ca13457 - STARTED
       |   +~ qtp348159759{STARTED,10<=20<=200,i=2,q=0} - STARTED
       |   +~ org.eclipse.jetty.util.thread.ScheduledExecutorScheduler@1ca4b0fd - STARTED
       |   +- org.eclipse.jetty.io.ArrayByteBufferPool@3838889e
       |   += SslConnectionFactory@7b040213{SSL->http/1.1} - STARTED
       |   |   += SslContextFactory@a3ac71d(file:///workspace/myApp/myApp-server/webapps/conf/iDS.keystore,null) trustAll=false
       |   |       +- Protocol Selections
       |   |       |   +- Enabled (size=3)
       |   |       |   |   +- TLSv1
       |   |       |   |   +- TLSv1.1
       |   |       |   |   +- TLSv1.2
       |   |       |   +- Disabled (size=2)
       |   |       |       +- SSLv2Hello - ConfigExcluded:'SSLv2Hello'
       |   |       |       +- SSLv3 - JreDisabled:java.security, ConfigExcluded:'SSLv3'
       |   |       +- Cipher Suite Selections
       |   |           +- Enabled (size=43)
       |   |           |   [CIPHERS]
       |   |           +- Disabled (size=39)
       |   |               [CIPHERS]
       |   += HttpConnectionFactory@116d58cf[HTTP/1.1] - STARTED
       |   |   +- HttpConfiguration@3ba7eaf0{32768/8192,8192/8192,https://:8443,[SecureRequestCustomizer@229efbd3]}
       |   += org.eclipse.jetty.server.ServerConnector$ServerConnectorManager@14690caf - STARTED
       |   |   += org.eclipse.jetty.io.ManagedSelector@e1ecb28 id=0 keys=0 selected=0 id=0
       |   |   |   +- sun.nio.ch.KQueueSelectorImpl@2edda3f6 keys=0
       |   |   += org.eclipse.jetty.io.ManagedSelector@aea4071 id=1 keys=0 selected=0 id=1
       |   |   |   +- sun.nio.ch.KQueueSelectorImpl@2482929a keys=0
       |   |   += org.eclipse.jetty.io.ManagedSelector@5fff729c id=2 keys=0 selected=0 id=2
       |   |   |   +- sun.nio.ch.KQueueSelectorImpl@7f0a5bb3 keys=0
       |   |   += org.eclipse.jetty.io.ManagedSelector@32f11b8 id=3 keys=0 selected=0 id=3
       |   |       +- sun.nio.ch.KQueueSelectorImpl@153f56b1 keys=0
       |   +- sun.nio.ch.ServerSocketChannelImpl[/0:0:0:0:0:0:0:0:8443]
       |   +- qtp348159759-90-acceptor-0@6a934d20-ServerConnector@31de14e{SSL,[ssl, http/1.1]}{0.0.0.0:8443}
       += org.eclipse.jetty.server.handler.ContextHandlerCollection@7b10dd7e[o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}, o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}] - STARTED
       |   += o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps} - STARTED
       |   |   += org.eclipse.jetty.server.session.SessionHandler589427621==dftMaxIdleSec=1800 - STARTED
       |   |   |   += org.eclipse.jetty.security.ConstraintSecurityHandler@76e1ecf - STARTED
       |   |   |   |   +- org.eclipse.jetty.security.DefaultAuthenticatorFactory@7cb77d4b
       |   |   |   |   += org.eclipse.jetty.servlet.ServletHandler@1b1b48e - STARTED
       |   |   |   |   |   += org.eclipse.jetty.servlet.ListenerHolder@2da1d3c6 - STARTED
       |   |   |   |   |   += org.eclipse.jetty.servlet.ListenerHolder@5ace38db - STARTED
       |   |   |   |   |   += default@5c13d641==org.eclipse.jetty.servlet.DefaultServlet,jsp=null,order=0,inst=true - STARTED
       |   |   |   |   |   |   +- aliases=false
       |   |   |   |   |   |   +- dirAllowed=true
       |   |   |   |   |   |   +- maxCacheSize=256000000
       |   |   |   |   |   |   +- maxCachedFileSize=200000000
       |   |   |   |   |   |   +- welcomeServlets=false
       |   |   |   |   |   |   +- useFileMappedBuffer=true
       |   |   |   |   |   |   +- acceptRanges=true
       |   |   |   |   |   |   +- etags=false
       |   |   |   |   |   |   +- maxCachedFiles=2048
       |   |   |   |   |   |   +- redirectWelcome=false
       |   |   |   |   |   += jsp@19c47==org.eclipse.jetty.jsp.JettyJspServlet,jsp=null,order=0,inst=true - STARTED
       |   |   |   |   |   |   +- fork=false
       |   |   |   |   |   |   +- compilerSourceVM=1.7
       |   |   |   |   |   |   +- logVerbosityLevel=DEBUG
       |   |   |   |   |   |   +- compilerTargetVM=1.7
       |   |   |   |   |   |   +- scratchdir=/private/var/folders/8p/f__1hb6j0p5bq7ljqdkjg35h0000gn/T/jetty-0.0.0.0-8080-myContext-_myContext-any-6227228818832412481.dir/jsp
       |   |   |   |   |   |   +- xpoweredBy=false
       |   |   |   |   |   +- [/]=>default
       |   |   |   |   |   +- [*.jsp, *.jspf, *.jspx, *.xsp, *.JSP, *.JSPF, *.JSPX, *.XSP]=>jsp
       |   |   |   |   |   += org.eclipse.jetty.servlet.ListenerHolder@1dd44bec - STARTED
       |   |   |   |   |   += org.eclipse.jetty.servlet.ListenerHolder@114d991c - STARTED
       |   |   |   |   |   += ISSSecurityFilter - STARTED
       |   |   |   |   |   += GzipFilter - STARTED
       |   |   |   |   |   |   +- mimeTypes=text/plain,text/html,text/css,application/javascript,application/x-javascript,application/json
       |   |   |   |   |   += Dashboard@38fd0a74==com.example.web.Dashboard,jsp=null,order=1,inst=true - STARTED
       |   |   |   |   |   |   +- parameter=value
       |   |   |   |   |   += idental-mvc@441f8928==org.springframework.web.servlet.DispatcherServlet,jsp=null,order=-1,inst=false - STARTED
       |   |   |   |   |   [SERVLET MAPPING]
       |   |   |   |   |   +~ Jetty_WebSocketUpgradeFilter - STARTED
       |   |   |   |   |   +- [/*]/[]==1=>Jetty_WebSocketUpgradeFilter
  |   |   |   |   |
  |   |   |   |   +> null
  |   |   |   |   +> null
  |   |   |   |   +> null
  |   |   |   |   +> []
  |   |   |   |   +> /*={*={RoleInfo[],Confidential}}
  |   |   |   |   +> /={TRACE={RoleInfo,F,C[],None}, TRACE.omission={RoleInfo[],None}}
  |   |   |   +~ com.example.web.ContextListener@32d15710
  |   |   |   += org.eclipse.jetty.server.session.DefaultSessionCache@19f2b971[evict=-1,removeUnloadable=false,saveOnCreate=false,saveOnInactiveEvict=false] - STARTED
  |   |   |   |   += org.eclipse.jetty.server.session.NullSessionDataStore@26c61a88[passivating=false,graceSec=3600] - STARTED
  |   |   |   +~ org.eclipse.jetty.server.session.DefaultSessionIdManager@5bbef235[worker=node0] - STARTED
  |   |   += org.eclipse.jetty.servlet.ErrorPageErrorHandler@636f4785 - STARTED
  |   |   +~ org.eclipse.jetty.websocket.jsr356.server.ServerContainer@6fda53a8 - STOPPED
  |   |   |
  |   |   +> WebAppClassLoader=myContext@27e16098
  |   |   |   [LIBS]
  |   |   |   +- sun.misc.Launcher$AppClassLoader@18b4aac2
  |   |   +> Systemclasses o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}
  |   |   |   +- java.
  |   |   |   +- javax.
  |   |   |   +- org.eclipse.jetty.continuation.
  |   |   |   +- org.eclipse.jetty.jaas.
  |   |   |   +- org.eclipse.jetty.jmx.
  |   |   |   +- org.eclipse.jetty.jndi.
  |   |   |   +- org.eclipse.jetty.jsp.JettyJspServlet
  |   |   |   +- org.eclipse.jetty.servlet.DefaultServlet
  |   |   |   +- org.eclipse.jetty.servlets.PushCacheFilter
  |   |   |   +- org.eclipse.jetty.servlets.PushSessionCacheFilter
  |   |   |   +- org.eclipse.jetty.util.annotation.
  |   |   |   +- org.eclipse.jetty.util.log.
  |   |   |   +- org.eclipse.jetty.websocket.
  |   |   |   +- org.w3c.
  |   |   |   +- org.xml.
  |   |   +> Serverclasses o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}
  |   |   |   +- -org.eclipse.jetty.alpn.
  |   |   |   +- -org.eclipse.jetty.apache.
  |   |   |   +- -org.eclipse.jetty.continuation.
  |   |   |   +- -org.eclipse.jetty.jaas.
  |   |   |   +- -org.eclipse.jetty.jmx.
  |   |   |   +- -org.eclipse.jetty.jndi.
  |   |   |   +- -org.eclipse.jetty.jsp.
  |   |   |   +- -org.eclipse.jetty.server.session.SessionData
  |   |   |   +- -org.eclipse.jetty.servlet.DefaultServlet
  |   |   |   +- -org.eclipse.jetty.servlet.NoJspServlet
  |   |   |   +- -org.eclipse.jetty.servlet.listener.
  |   |   |   +- -org.eclipse.jetty.servlets.
  |   |   |   +- -org.eclipse.jetty.util.annotation.
  |   |   |   +- -org.eclipse.jetty.util.log.
  |   |   |   +- -org.eclipse.jetty.websocket.
  |   |   |   +- org.eclipse.jdt.
  |   |   |   +- org.eclipse.jetty.
  |   |   |   +- org.objectweb.asm.
  |   |   +> Configurations o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}
  |   |   |   +- org.eclipse.jetty.webapp.WebInfConfiguration@795e1681
  |   |   |   +- org.eclipse.jetty.webapp.WebXmlConfiguration@55dd7cc5
  |   |   |   +- org.eclipse.jetty.webapp.MetaInfConfiguration@4c174a94
  |   |   |   +- org.eclipse.jetty.webapp.FragmentConfiguration@71ed07ad
  |   |   |   +- org.eclipse.jetty.webapp.JettyWebXmlConfiguration@780efd0f
  |   |   +> Handler attributes o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}
  |   |   |   +- javax.servlet.context.tempdir=/private/var/folders/8p/f__1hb6j0p5bq7ljqdkjg35h0000gn/T/jetty-0.0.0.0-8080-myContext-_myContext-any-6227228818832412481.dir
  |   |   |   +- org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.SCI=WebSocketUpgradeFilter[configuration=org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration@468b9d9f]
  |   |   |   +- org.eclipse.jetty.server.Executor=qtp348159759{STARTED,10<=20<=200,i=2,q=0}
  |   |   |   +- org.apache.catalina.jsp_classpath=[LIBS]
  |   |   |   +- javax.websocket.server.ServerContainer=org.eclipse.jetty.websocket.jsr356.server.ServerContainer@6fda53a8
  |   |   +> Context attributes o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}
  |   |   |   +- org.eclipse.jetty.util.DecoratedObjectFactory=org.eclipse.jetty.util.DecoratedObjectFactory[decorators=1]
  |   |   |   +- com.sun.jsp.tagFileJarUrlsCache={}
  |   |   |   +- org.springframework.web.context.support.ServletContextScope=org.springframework.web.context.support.ServletContextScope@30be2c30
  |   |   |   +- org.springframework.web.context.WebApplicationContext.ROOT=Root WebApplicationContext: startup date [Thu Mar 02 22:05:59 ICT 2017]; root of context hierarchy
  |   |   |   +- resourceCache=ResourceCache[null,org.eclipse.jetty.servlet.DefaultServlet@297785e5]@647951169
  |   |   |   +- org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration=org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration@468b9d9f
  |   |   |   +- org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter=WebSocketUpgradeFilter[configuration=org.eclipse.jetty.websocket.server.NativeWebSocketConfiguration@468b9d9f]
  |   |   |   +- com.sun.jsp.taglibraryCache={}
  |   |   +> Initparams o.e.j.w.WebAppContext@3e778e26{/myContext,file:///workspace/myApp/myApp-server/webapps/myContext/,AVAILABLE}{/workspace/myApp/myApp-server/webapps}
  |   |       +- contextConfigLocation=classpath:applicationContext.xml
  |   |       +- org.eclipse.jetty.servlet.Default.dirAllowed=false
  |   += o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data} - STARTED
  |       += org.eclipse.jetty.server.session.SessionHandler1013179752==dftMaxIdleSec=1800 - STARTED
  |       |   += org.eclipse.jetty.security.ConstraintSecurityHandler@7dfd9178 - STARTED
  |       |   |   +- org.eclipse.jetty.security.DefaultAuthenticatorFactory@68b06b8f
  |       |   |   += org.eclipse.jetty.servlet.ServletHandler@39e59923 - STARTED
  |       |   |   |   += org.eclipse.jetty.servlet.ListenerHolder@1a8e73d2 - STARTED
  |       |   |   |   += org.eclipse.jetty.servlet.ListenerHolder@b6957aa - STARTED
  |       |   |   |   += default@5c13d641==org.eclipse.jetty.servlet.DefaultServlet,jsp=null,order=0,inst=true - STARTED
  |       |   |   |   |   +- aliases=false
  |       |   |   |   |   +- dirAllowed=true
  |       |   |   |   |   +- maxCacheSize=256000000
  |       |   |   |   |   +- maxCachedFileSize=200000000
  |       |   |   |   |   +- welcomeServlets=false
  |       |   |   |   |   +- useFileMappedBuffer=true
  |       |   |   |   |   +- acceptRanges=true
  |       |   |   |   |   +- etags=false
  |       |   |   |   |   +- maxCachedFiles=2048
  |       |   |   |   |   +- redirectWelcome=false
  |       |   |   |   += jsp@19c47==org.eclipse.jetty.jsp.JettyJspServlet,jsp=null,order=0,inst=true - STARTED
  |       |   |   |   |   +- fork=false
  |       |   |   |   |   +- compilerSourceVM=1.7
  |       |   |   |   |   +- logVerbosityLevel=DEBUG
  |       |   |   |   |   +- compilerTargetVM=1.7
  |       |   |   |   |   +- scratchdir=/private/var/folders/8p/f__1hb6j0p5bq7ljqdkjg35h0000gn/T/jetty-0.0.0.0-8080-my_persistent-_myContext_persistent-any-707911495794918084.dir/jsp
  |       |   |   |   |   +- xpoweredBy=false
  |       |   |   |   +- [/]=>default
  |       |   |   |   +- [*.jsp, *.jspf, *.jspx, *.xsp, *.JSP, *.JSPF, *.JSPX, *.XSP]=>jsp
  |       |   |   |
  |       |   |   +> null
  |       |   |   +> null
  |       |   |   +> null
  |       |   |   +> []
  |       |   |   +> /={TRACE={RoleInfo,F,C[],None}, TRACE.omission={RoleInfo[],None}}
  |       |   += org.eclipse.jetty.server.session.DefaultSessionCache@606eb95b[evict=-1,removeUnloadable=false,saveOnCreate=false,saveOnInactiveEvict=false] - STARTED
  |       |   |   += org.eclipse.jetty.server.session.NullSessionDataStore@755718f4[passivating=false,graceSec=3600] - STARTED
  |       |   +~ org.eclipse.jetty.server.session.DefaultSessionIdManager@5bbef235[worker=node0] - STARTED
  |       += org.eclipse.jetty.servlet.ErrorPageErrorHandler@1c2ee56f - STARTED
  |       |
  |       +> WebAppClassLoader=1053927516@3ed1a85c
  |       |   +- sun.misc.Launcher$AppClassLoader@18b4aac2
  |       +> Systemclasses o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}
  |       |   +- java.
  |       |   +- javax.
  |       |   +- org.eclipse.jetty.continuation.
  |       |   +- org.eclipse.jetty.jaas.
  |       |   +- org.eclipse.jetty.jmx.
  |       |   +- org.eclipse.jetty.jndi.
  |       |   +- org.eclipse.jetty.jsp.JettyJspServlet
  |       |   +- org.eclipse.jetty.servlet.DefaultServlet
  |       |   +- org.eclipse.jetty.servlets.PushCacheFilter
  |       |   +- org.eclipse.jetty.servlets.PushSessionCacheFilter
  |       |   +- org.eclipse.jetty.util.annotation.
  |       |   +- org.eclipse.jetty.util.log.
  |       |   +- org.eclipse.jetty.websocket.
  |       |   +- org.w3c.
  |       |   +- org.xml.
  |       +> Serverclasses o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}
  |       |   +- -org.eclipse.jetty.alpn.
  |       |   +- -org.eclipse.jetty.apache.
  |       |   +- -org.eclipse.jetty.continuation.
  |       |   +- -org.eclipse.jetty.jaas.
  |       |   +- -org.eclipse.jetty.jmx.
  |       |   +- -org.eclipse.jetty.jndi.
  |       |   +- -org.eclipse.jetty.jsp.
  |       |   +- -org.eclipse.jetty.server.session.SessionData
  |       |   +- -org.eclipse.jetty.servlet.DefaultServlet
  |       |   +- -org.eclipse.jetty.servlet.NoJspServlet
  |       |   +- -org.eclipse.jetty.servlet.listener.
  |       |   +- -org.eclipse.jetty.servlets.
  |       |   +- -org.eclipse.jetty.util.annotation.
  |       |   +- -org.eclipse.jetty.util.log.
  |       |   +- -org.eclipse.jetty.websocket.
  |       |   +- org.eclipse.jdt.
  |       |   +- org.eclipse.jetty.
  |       |   +- org.objectweb.asm.
  |       +> Configurations o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}
  |       |   +- org.eclipse.jetty.webapp.WebInfConfiguration@5d3b3547
  |       |   +- org.eclipse.jetty.webapp.WebXmlConfiguration@488aebda
  |       |   +- org.eclipse.jetty.webapp.MetaInfConfiguration@5d7da87
  |       |   +- org.eclipse.jetty.webapp.FragmentConfiguration@6eb942cf
  |       |   +- org.eclipse.jetty.webapp.JettyWebXmlConfiguration@6a2cd352
  |       +> Handler attributes o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}
  |       |   +- javax.servlet.context.tempdir=/private/var/folders/8p/f__1hb6j0p5bq7ljqdkjg35h0000gn/T/jetty-0.0.0.0-8080-my_persistent-_myContext_persistent-any-707911495794918084.dir
  |       |   +- org.eclipse.jetty.server.Executor=qtp348159759{STARTED,10<=20<=200,i=2,q=0}
  |       +> Context attributes o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}
  |       |   +- org.eclipse.jetty.util.DecoratedObjectFactory=org.eclipse.jetty.util.DecoratedObjectFactory[decorators=1]
  |       |   +- com.sun.jsp.tagFileJarUrlsCache={}
  |       |   +- resourceCache=ResourceCache[null,org.eclipse.jetty.servlet.DefaultServlet@756731f6]@1323290175
  |       |   +- com.sun.jsp.taglibraryCache={}
  |       +> Initparams o.e.j.w.WebAppContext@2974d7ef{/myContext_persistent,file:///workspace/myApp/myApp-server/data/my_persistent/,AVAILABLE}{/workspace/myApp/myApp-server/data}
  |           +- org.eclipse.jetty.servlet.Default.dirAllowed=false
  += org.eclipse.jetty.server.handler.ErrorHandler@6ad45211 - STARTED
  +- {}
  +- {}
  +- {}
  += org.eclipse.jetty.server.session.DefaultSessionIdManager@5bbef235[worker=node0] - STARTED
  |   += org.eclipse.jetty.server.session.HouseKeeper@666eba5a[interval=600000, ownscheduler=false] - STARTED
  |
  +> sun.misc.Launcher$AppClassLoader@18b4aac2
      [LIBS]
      +- sun.misc.Launcher$ExtClassLoader@fae8daf

The above code works fine with Jetty 9.1.5.v20140505 and Java 7 but when fail when I upgrade to Jetty 9.4.1.v20170120 and Java 8. Browser console report an 404 error.

WebSocket connection to 'wss://localhost:8443/myContext/ws/communication/5/kbui/None' failed: Unexpected response code: 404

Did I miss something when upgrade Jetty?
Thanks in advance.

Dump your server (post-startup) and report its tree in your question. `server.dumpStdErr();` — Joakim Erdfelt, Mar 02 '17 at 12:43
I post the dump, because size is limited to 30000 chars, I must put placeholders for some content such as jar files, servlets mapping.. — Khoa Bui, Mar 02 '17 at 14:45
I updated dump with your command server.dumpSteErr() instead of the option in Jetty.xml, and it logs more of websocket. I see a strange line **+~ org.eclipse.jetty.websocket.jsr356.server.ServerContainer@6fda53a8 - STOPPED**. — Khoa Bui, Mar 02 '17 at 15:33

score 0 · Accepted Answer · answered Mar 02 '17 at 20:35

Judging from your setup, you'll wind up with ...

wss://localhost:8443/myContext/ws/communication/5/kbui/None

Your contextPath isn't /context, its actually /myContext in your setup.

You trimmed out the Servlet Mappings section on the dump (that was the important part. heh)

But attempting to manually add the WSCommunication Endpoint contained in WebAppContext from outside of the WebAppClassloader or the WebApp's ServletContext is probably going to be a problem as well.

You have 3 options:

The JSR356 Automatic Way

Setup bytecode scanning and annotation discovery for your WebAppContext and let the startup discover and auto-load the WSCommunication endpoint.

Add the following to your webContext ...

webContext.setAttribute("org.eclipse.jetty.websocket.jsr356",Boolean.TRUE);

webContext.setConfigurations(new Configuration[] {
            new AnnotationConfiguration(),
            new WebXmlConfiguration(),
            new WebInfConfiguration(),
            new PlusConfiguration(), 
            new MetaInfConfiguration(),
            new FragmentConfiguration(), 
            new EnvConfiguration()});

And add the jetty-annotations dependency to your project.

The JSR356 Manual Way

Use the javax.websocket.server.ServerApplicationConfig to report the WSCommunication as being available to be added from within the webapp's startup.
The Servlet Spec Manual Way

This is the easiest approach. Create a javax.servlet.ServletContextListener that adds the WSCommunication endpoint to the ServerContainer

public class MyContextListener implements ServletContextListener
{
    @Override
    public void contextDestroyed(ServletContextEvent sce)
    {
    }

    @Override
    public void contextInitialized(ServletContextEvent sce)
    {
        ServerContainer container = (ServerContainer)sce.getServletContext()
                   .getAttribute(ServerContainer.class.getName());

        try
        {
            container.addEndpoint(WSCommunication.class);
        }
        catch (DeploymentException e)
        {
            throw new RuntimeException("Unable to add endpoint",e);
        }
    }
}

I try the #1 approach and it works like a charm. Thanks so much. — Khoa Bui, Mar 02 '17 at 23:43
About how previous code works on 9.1.5, you mean I setup websocket wrong, but 9.1.5 still accept, going to 9.4.1 the Jetty server is more strict then it refuse. Right? — Khoa Bui, Mar 02 '17 at 23:44
Another question, in reality, my server may support multiple contexts, all of 3 approaches still work with multiple WebAppContext? — Khoa Bui, Mar 02 '17 at 23:47
I tested #1, works with multiple contexts (each context have own WSCommunication websocket connection). — Khoa Bui, Mar 02 '17 at 23:57

Websocket JSR-356 fail with Jetty 9.4.1

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