I get the following stacktrace when I try to go through an authentication
handler I have setup.  Any suggestions to the cause?

19.04.2010 11:42:47.604 *WARN* [116647...@qtp-1246618622-16]
org.mortbay.jetty EXCEPTION  java.lang.NullPointerException
        at
org.apache.sling.commons.auth.impl.engine.EngineAuthenticationHandlerHolder.doExtractCredentials(EngineAuthenticationHandlerHolder.java:63)
        at
org.apache.sling.commons.auth.impl.AbstractAuthenticationHandlerHolder.extractCredentials(AbstractAuthenticationHandlerHolder.java:60)
        at
org.apache.sling.commons.auth.impl.SlingAuthenticator.getAuthenticationInfo(SlingAuthenticator.java:560)
        at
org.apache.sling.commons.auth.impl.SlingAuthenticator.handleSecurity(SlingAuthenticator.java:374)
        at
org.apache.sling.engine.impl.SlingMainServlet.handleSecurity(SlingMainServlet.java:832)
        at
org.ops4j.pax.web.service.internal.HttpServiceServletHandler.handle(HttpServiceServletHandler.java:62)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at
org.ops4j.pax.web.service.internal.HttpServiceContext.handle(HttpServiceContext.java:111)
        at
org.ops4j.pax.web.service.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:64)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
        at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)

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