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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:393)	at org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:229)	at webwork.view.taglib.BeanTag.doStartTag(BeanTag.java:79)	at org.apache.jsp.navigator_0002dfull$jsp._jspService(navigator_0002dfull$jsp.java:1358)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:683)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:431)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:355)	at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:260)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:129)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:61)	at com.atlassian.jira.web.filters.SitemeshExcludePathFilter.doFilter(SitemeshExcludePathFilter.java:36)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:164)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:181)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.jira.web.filters.ActionCleanupDelayFilter.doFilter(ActionCleanupDelayFilter.java:37)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:96)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.jira.web.filters.gzip.GzipFilter.doFilter(GzipFilter.java:60)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:38)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:429)	at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:495)	at java.lang.Thread.run(Thread.java:534)