Just downloaded the new "appengine-java-sdk-1.5.1_prerelease.zip" and ran 
the dev_appserver, only to receive the following exception.  The Jetty 
server starts up as expected, but will only serve 503s.

WARNING: Failed startup of context 
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@4463a1ae{/,/devel/rblog/WAR}
java.lang.NullPointerException
at 
com.google.appengine.tools.appstats.Recorder.checkNotNull(Recorder.java:365)
at com.google.appengine.tools.appstats.Recorder.<init>(Recorder.java:207)
at com.google.appengine.tools.appstats.Recorder.<init>(Recorder.java:197)
at 
com.google.appengine.tools.appstats.AppstatsFilter.init(AppstatsFilter.java:183)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at 
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:662)
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:186)
at 
com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:162)
at 
com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:164)
at 
com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:164)
at 
com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
at 
com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
at 
com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)

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