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java.lang.NullPointerException: 	at java.lang.Class.isAssignableFrom(Native Method)	at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)	at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)	at org.mortbay.jetty.Server.doStart(Server.java:224)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:271)	at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:284)	at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)	at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:87)	at com.google.appengine.tools.development.Modules.startup(Modules.java:105)	at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl.doStart(DevAppServer2Impl.java:242)	at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl.access$000(DevAppServer2Impl.java:56)	at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl$1.run(DevAppServer2Impl.java:208)	at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl$1.run(DevAppServer2Impl.java:206)	at java.security.AccessController.doPrivileged(Native Method)	at com.google.appengine.tools.development.devappserver2.DevAppServer2Impl.start(DevAppServer2Impl.java:206)	at com.google.appengine.tools.development.devappserver2.StandaloneInstance$StartAction.apply(StandaloneInstance.java:128)	at com.google.appengine.tools.development.devappserver2.StandaloneInstance$StartAction.apply(StandaloneInstance.java:82)	at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)	at com.google.appengine.tools.development.devappserver2.StandaloneInstance.run(StandaloneInstance.java:66)	at com.google.appengine.tools.development.devappserver2.StandaloneInstance.main(StandaloneInstance.java:44)