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java.lang.IllegalArgumentException: Object is not of type class org.eclipse.jetty.webapp.WebAppContext	at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:204)	at org.eclipse.jetty.plus.webapp.EnvConfiguration.configure(EnvConfiguration.java:98)	at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:473)	at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1174)	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:598)	at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:496)	at org.mortbay.jetty.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:175)	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)	at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:226)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:164)	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)	at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:226)	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)	at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:93)	at org.eclipse.jetty.server.Server.doStart(Server.java:244)	at org.mortbay.jetty.plugin.JettyServer.doStart(JettyServer.java:67)	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)	at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:447)	at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:387)	at org.mortbay.jetty.plugin.JettyRunMojo.execute(JettyRunMojo.java:555)	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)