I created & downloaded the starter app for plain Java, and tried packaging a production WAR.
If i add to my Jetty 9.4.30 distribution, i got this error message:
[WrapperStartStopAppMain]
WARN org.atmosphere.cpr.DefaultAsyncSupportResolver - Failed to create AsyncSupport class: class org.atmosphere.container.JettyServlet30AsyncSupportWithWebSocket, error: {}
jvm 1 | java.lang.reflect.InvocationTargetException
jvm 1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
jvm 1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
jvm 1 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
jvm 1 | at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
jvm 1 | at org.atmosphere.cpr.DefaultAsyncSupportResolver.newCometSupport(DefaultAsyncSupportResolver.java:237)
jvm 1 | at org.atmosphere.cpr.DefaultAsyncSupportResolver.resolveWebSocket(DefaultAsyncSupportResolver.java:308)
jvm 1 | at org.atmosphere.cpr.DefaultAsyncSupportResolver.resolve(DefaultAsyncSupportResolver.java:294)
jvm 1 | at org.atmosphere.cpr.AtmosphereFramework.autoDetectContainer(AtmosphereFramework.java:2092)
jvm 1 | at org.atmosphere.cpr.AtmosphereFramework.init(AtmosphereFramework.java:914)
jvm 1 | at org.atmosphere.cpr.AtmosphereFramework.init(AtmosphereFramework.java:838)
jvm 1 | at com.vaadin.flow.server.communication.PushRequestHandler.initAtmosphere(PushRequestHandler.java:220)
jvm 1 | at com.vaadin.flow.server.communication.JSR356WebsocketInitializer.initAtmosphereForVaadinServlet(JSR356WebsocketInitializer.java:184)
jvm 1 | at com.vaadin.flow.server.communication.JSR356WebsocketInitializer.init(JSR356WebsocketInitializer.java:149)
jvm 1 | at com.vaadin.flow.server.communication.JSR356WebsocketInitializer.contextInitialized(JSR356WebsocketInitializer.java:118)
jvm 1 | at com.vaadin.flow.server.startup.ServletContextListeners.contextInitialized(ServletContextListeners.java:42)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:1002)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:553)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.contextInitialized(ContextHandler.java:931)
jvm 1 | at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:764)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:360)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1445)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1409)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:844)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:275)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:425)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.server.Server.start(Server.java:408)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.server.Server.doStart(Server.java:372)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.xml.XmlConfiguration.lambda$main$1(XmlConfiguration.java:1929)
jvm 1 | at java.security.AccessController.doPrivileged(Native Method)
jvm 1 | at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1878)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | at java.lang.reflect.Method.invoke(Method.java:498)
jvm 1 | at org.eclipse.jetty.start.Main.invokeMain(Main.java:218)
jvm 1 | at org.eclipse.jetty.start.Main.start(Main.java:491)
jvm 1 | at org.eclipse.jetty.start.Main.main(Main.java:77)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | at java.lang.reflect.Method.invoke(Method.java:498)
jvm 1 | at org.tanukisoftware.wrapper.WrapperStartStopApp.run(WrapperStartStopApp.java:264)
jvm 1 | at java.lang.Thread.run(Thread.java:748)
jvm 1 | Caused by: java.lang.NoClassDefFoundError: org/eclipse/jetty/websocket/WebSocketFactory$Acceptor
jvm 1 | at org.atmosphere.container.JettyServlet30AsyncSupportWithWebSocket.<init>(JettyServlet30AsyncSupportWithWebSocket.java:46)
jvm 1 | ... 61 more
jvm 1 | Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.WebSocketFactory$Acceptor
jvm 1 | at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
jvm 1 | at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
jvm 1 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
jvm 1 | at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:543)
jvm 1 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
jvm 1 | ... 62 more
jvm 1 | [WrapperStartStopAppMain]
ERROR org.atmosphere.cpr.DefaultAsyncSupportResolver - Real error: org/eclipse/jetty/websocket/WebSocketFactory$Acceptor
jvm 1 | java.lang.NoClassDefFoundError: org/eclipse/jetty/websocket/WebSocketFactory$Acceptor
jvm 1 | at org.atmosphere.container.JettyServlet30AsyncSupportWithWebSocket.<init>(JettyServlet30AsyncSupportWithWebSocket.java:46)
jvm 1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
jvm 1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
jvm 1 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
jvm 1 | at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
jvm 1 | at org.atmosphere.cpr.DefaultAsyncSupportResolver.newCometSupport(DefaultAsyncSupportResolver.java:237)
jvm 1 | at org.atmosphere.cpr.DefaultAsyncSupportResolver.resolveWebSocket(DefaultAsyncSupportResolver.java:308)
jvm 1 | at org.atmosphere.cpr.DefaultAsyncSupportResolver.resolve(DefaultAsyncSupportResolver.java:294)
jvm 1 | at org.atmosphere.cpr.AtmosphereFramework.autoDetectContainer(AtmosphereFramework.java:2092)
jvm 1 | at org.atmosphere.cpr.AtmosphereFramework.init(AtmosphereFramework.java:914)
jvm 1 | at org.atmosphere.cpr.AtmosphereFramework.init(AtmosphereFramework.java:838)
jvm 1 | at com.vaadin.flow.server.communication.PushRequestHandler.initAtmosphere(PushRequestHandler.java:220)
jvm 1 | at com.vaadin.flow.server.communication.JSR356WebsocketInitializer.initAtmosphereForVaadinServlet(JSR356WebsocketInitializer.java:184)
jvm 1 | at com.vaadin.flow.server.communication.JSR356WebsocketInitializer.init(JSR356WebsocketInitializer.java:149)
jvm 1 | at com.vaadin.flow.server.communication.JSR356WebsocketInitializer.contextInitialized(JSR356WebsocketInitializer.java:118)
jvm 1 | at com.vaadin.flow.server.startup.ServletContextListeners.contextInitialized(ServletContextListeners.java:42)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:1002)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:553)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.contextInitialized(ContextHandler.java:931)
jvm 1 | at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:764)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:360)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1445)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1409)
jvm 1 | at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:844)
jvm 1 | at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:275)
jvm 1 | at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:425)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
jvm 1 | at org.eclipse.jetty.server.Server.start(Server.java:408)
jvm 1 | at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
jvm 1 | at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
jvm 1 | at org.eclipse.jetty.server.Server.doStart(Server.java:372)
jvm 1 | at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
jvm 1 | at org.eclipse.jetty.xml.XmlConfiguration.lambda$main$1(XmlConfiguration.java:1929)
jvm 1 | at java.security.AccessController.doPrivileged(Native Method)
jvm 1 | at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1878)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | at java.lang.reflect.Method.invoke(Method.java:498)
jvm 1 | at org.eclipse.jetty.start.Main.invokeMain(Main.java:218)
jvm 1 | at org.eclipse.jetty.start.Main.start(Main.java:491)
jvm 1 | at org.eclipse.jetty.start.Main.main(Main.java:77)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
jvm 1 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | at java.lang.reflect.Method.invoke(Method.java:498)
jvm 1 | at org.tanukisoftware.wrapper.WrapperStartStopApp.run(WrapperStartStopApp.java:264)
jvm 1 | at java.lang.Thread.run(Thread.java:748)
jvm 1 | Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.WebSocketFactory$Acceptor
jvm 1 | at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
jvm 1 | at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
jvm 1 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
jvm 1 | at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:543)
jvm 1 | at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
jvm 1 | ... 62 more
How could i resolve this? I am a Vaadin newbie…