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javax.servlet.ServletException: Principal not defined in configuration
javax.servlet.ServletException: Principal not defined in configuration	at org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler.init(KerberosAuthenticationHandler.java:146)	at org.apache.hadoop.security.authentication.server.AuthenticationFilter.init(AuthenticationFilter.java:146)	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:713)	at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)	at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)	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 org.apache.hadoop.http.HttpServer.start(HttpServer.java:617)	at org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:173)	at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:529)	at org.apache.hadoop.hdfs.server.namenode.NameNode.startCommonServices(NameNode.java:471)	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:434)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:590)	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:571)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1134)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1193)