I have the error when I start an application and i don't know because.
Grave: Failed to invoke class org.zkoss.zkmax.init.WebAppInit
java.lang.NoSuchMethodError: javax.servlet.ServletContext.addServlet(Ljava/lang/String;Ljava/lang/Class;)Ljavax/servlet/ServletRegistration$Dynamic;
at org.zkoss.zkmax.ui.comet.CometAsyncServlet.install(CometAsyncServlet.java:56)
at org.zkoss.zkmax.init.WebAppInit.init(WebAppInit.java:32)
at org.zkoss.zk.ui.util.Configuration.invokeWebAppInits(Configuration.java:732)
at org.zkoss.zk.ui.impl.AbstractWebApp.init(AbstractWebApp.java:204)
at org.zkoss.zk.ui.http.SimpleWebApp.init(SimpleWebApp.java:58)
at org.zkoss.zk.ui.http.WebManager.(WebManager.java:228)
at org.zkoss.zk.ui.http.HttpSessionListener23.contextInitialized(HttpSessionListener23.java:140)
at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:540)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:135)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:110)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.plugin.AbstractJettyRunMojo$1.filesChanged(AbstractJettyRunMojo.java:409)
at org.mortbay.util.Scanner.reportBulkChanges(Scanner.java:493)
at org.mortbay.util.Scanner.reportDifferences(Scanner.java:359)
at org.mortbay.util.Scanner.scan(Scanner.java:286)
at org.mortbay.util.Scanner$1.run(Scanner.java:246)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
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