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java.lang.NullPointerException: 	at org.apache.catalina.connector.Response.toAbsolute(Response.java:1485)	at org.apache.catalina.connector.Response.encodeURL(Response.java:1121)	at org.apache.catalina.connector.ResponseFacade.encodeURL(ResponseFacade.java:366)	at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)	at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)	at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)	at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)	at org.apache.pluto.internal.impl.PortletResponseImpl.encodeURL(PortletResponseImpl.java:124)	at org.apache.taglibs.standard.tag.common.core.UrlSupport.doEndTag(UrlSupport.java:110)	at org.apache.jsp.WEB_002dINF.jsp.calendarNarrowView_jsp._jspx_meth_c_005furl_005f0(calendarNarrowView_jsp.java:443)	at org.apache.jsp.WEB_002dINF.jsp.calendarNarrowView_jsp._jspService(calendarNarrowView_jsp.java:184)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:227)	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)	at org.springframework.web.servlet.ViewRendererServlet.renderView(ViewRendererServlet.java:111)	at org.springframework.web.servlet.ViewRendererServlet.processRequest(ViewRendererServlet.java:84)	at org.springframework.web.servlet.ViewRendererServlet.doGet(ViewRendererServlet.java:65)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)	at org.apache.pluto.internal.impl.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:106)	at org.springframework.web.portlet.DispatcherPortlet.doRender(DispatcherPortlet.java:1140)	at org.springframework.web.portlet.DispatcherPortlet.render(DispatcherPortlet.java:1094)	at org.springframework.web.portlet.DispatcherPortlet.doRenderService(DispatcherPortlet.java:832)	at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:483)	at org.springframework.web.portlet.FrameworkPortlet.doDispatch(FrameworkPortlet.java:453)	at javax.portlet.GenericPortlet.render(GenericPortlet.java:175)	at org.apache.pluto.core.PortletServlet.dispatch(PortletServlet.java:208)	at org.apache.pluto.core.PortletServlet.doGet(PortletServlet.java:139)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)	at org.apache.pluto.core.DefaultPortletInvokerService.invoke(DefaultPortletInvokerService.java:167)	at org.apache.pluto.core.DefaultPortletInvokerService.render(DefaultPortletInvokerService.java:101)	at org.apache.pluto.core.PortletContainerImpl.doRender(PortletContainerImpl.java:173)	at org.jasig.portal.channels.portlet.SpringPortletChannelImpl.render(SpringPortletChannelImpl.java:480)	at org.jasig.portal.channels.portlet.CSpringPortletAdaptor.renderCharacters(CSpringPortletAdaptor.java:186)	at org.jasig.portal.ChannelRenderer$Worker.execute(ChannelRenderer.java:545)	at org.jasig.portal.utils.threading.BaseTask.run(BaseTask.java:27)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)	at java.lang.Thread.run(Thread.java:619)