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java.lang.NullPointerException: 	at org.apache.hadoop.chukwa.hicc.Views.length(Views.java:130)	at org.apache.hadoop.chukwa.hicc.ViewsTag.doTag(ViewsTag.java:35)	at org.apache.jsp.jsp.workspace.manage_005fview_jsp._jspx_meth_my_findViews_0(org.apache.jsp.jsp.workspace.manage_005fview_jsp:141)	at org.apache.jsp.jsp.workspace.manage_005fview_jsp._jspService(org.apache.jsp.jsp.workspace.manage_005fview_jsp:114)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)	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:505)	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)