Dev mode for gwt20-json sample not working when using gwt 2.8.2

[boemska-aleksandar]

Hi,
We have successfully used atmosphere with gwt 2.7, but when tried to upgrade to 2.8.2 we had the following exception (using gwt20-json sample) when running mvn gwt:run command

[ERROR] SEVERE: Failed to initialize Atmosphere Framework
[ERROR] java.lang.NoClassDefFoundError: org/eclipse/jetty/websocket/servlet/WebSocketCreator
[ERROR]         at java.lang.Class.getDeclaredConstructors0(Native Method)
[ERROR]         at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
[ERROR]         at java.lang.Class.getConstructor0(Class.java:3075)
[ERROR]         at java.lang.Class.getDeclaredConstructor(Class.java:2178)
[ERROR]         at org.atmosphere.cpr.DefaultAsyncSupportResolver.newCometSupport(DefaultAsyncSupportResolver.java:236)
[ERROR]         at org.atmosphere.cpr.DefaultAsyncSupportResolver.resolveWebSocket(DefaultAsyncSupportResolver.java:308)
[ERROR]         at org.atmosphere.cpr.DefaultAsyncSupportResolver.resolve(DefaultAsyncSupportResolver.java:294)
[ERROR]         at org.atmosphere.cpr.AtmosphereFramework.autoDetectContainer(AtmosphereFramework.java:2088)
[ERROR]         at org.atmosphere.cpr.AtmosphereFramework.init(AtmosphereFramework.java:914)
[ERROR]         at org.atmosphere.cpr.AtmosphereFramework.init(AtmosphereFramework.java:838)
[ERROR]         at org.atmosphere.cpr.AtmosphereFrameworkInitializer.configureFramework(AtmosphereFrameworkInitializer.java:75)
[ERROR]         at org.atmosphere.cpr.AtmosphereServlet.configureFramework(AtmosphereServlet.java:84)
[ERROR]         at org.atmosphere.cpr.AtmosphereServlet.configureFramework(AtmosphereServlet.java:80)
[ERROR]         at org.atmosphere.cpr.AtmosphereServlet.init(AtmosphereServlet.java:75)
[ERROR]         at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:616)
[ERROR]         at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:396)
[ERROR]         at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:871)
[ERROR]         at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:298)
[ERROR]         at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
[ERROR]         at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
[ERROR]         at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
[ERROR]         at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
[ERROR]         at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:550)
[ERROR]         at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
[ERROR]         at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
[ERROR]         at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
[ERROR]         at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
[ERROR]         at org.eclipse.jetty.server.handler.RequestLogHandler.doStart(RequestLogHandler.java:140)
[ERROR]         at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
[ERROR]         at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
[ERROR]         at org.eclipse.jetty.server.Server.start(Server.java:387)
[ERROR]         at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
[ERROR]         at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
[ERROR]         at org.eclipse.jetty.server.Server.doStart(Server.java:354)
[ERROR]         at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
[ERROR]         at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:760)
[ERROR]         at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:636)
[ERROR]         at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:923)
[ERROR]         at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:706)
[ERROR]         at com.google.gwt.dev.DevMode.main(DevMode.java:432)
[ERROR] Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.servlet.WebSocketCreator
[ERROR]         at java.lang.ClassLoader.findClass(ClassLoader.java:530)
[ERROR]         at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[ERROR]         at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[ERROR]         at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:427)
[ERROR]         at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:403)
[ERROR]         ... 40 more

So, the problem is only in dev mode with jetty.

[boemska-aleksandar]

Ok, exceptions disappeared after adding jetty server dependency in pom.xml

<dependency>
    <groupId>org.eclipse.jetty.websocket</groupId>
    <artifactId>websocket-server</artifactId>
    <version>9.3.24.v20180605</version>
    <scope>provided</scope>
</dependency>

It works ok with jetty 9.3, versions 9.4 and 9.2 still throwing some various exceptions.