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java.lang.IllegalArgumentException: Specified content type 'text/plain' is not supported.	at org.apache.pluto.internal.impl.RenderResponseImpl.setContentType(RenderResponseImpl.java:126)	at javax.servlet.ServletResponseWrapper.setContentType(ServletResponseWrapper.java:129)	at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:810)	at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:354)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)	at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:631)	at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:625)	at org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103)	at org.apache.tiles.jsp.context.JspTilesRequestContext.dispatch(JspTilesRequestContext.java:96)	at org.apache.tiles.renderer.impl.UntypedAttributeRenderer.write(UntypedAttributeRenderer.java:61)	at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:103)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:659)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:337)	at org.apache.tiles.jsp.taglib.InsertAttributeTag.render(InsertAttributeTag.java:234)	at org.apache.tiles.jsp.taglib.InsertAttributeTag.render(InsertAttributeTag.java:211)	at org.apache.tiles.jsp.taglib.RenderTag.doEndTag(RenderTag.java:220)	at org.apache.jsp.WEB_002dINF.jsp.layouts.default_jsp._jspx_meth_tiles_insertAttribute_0(default_jsp.java:169)	at org.apache.jsp.WEB_002dINF.jsp.layouts.default_jsp._jspService(default_jsp.java:106)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)	at org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241)	at org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222)	at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)	at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:103)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:659)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:678)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:633)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:322)	at org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:75)	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:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)	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:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)	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:172)	at org.apache.pluto.driver.tags.PortletTag.doStartTag(PortletTag.java:152)	at org.apache.jsp.WEB_002dINF.themes.portlet_002dskin_jsp._jspx_meth_pluto_portlet_0(portlet_002dskin_jsp.java:99)	at org.apache.jsp.WEB_002dINF.themes.portlet_002dskin_jsp._jspService(portlet_002dskin_jsp.java:74)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)	at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspx_meth_c_forEach_1(pluto_002ddefault_002dtheme_jsp.java:480)	at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspx_meth_c_otherwise_0(pluto_002ddefault_002dtheme_jsp.java:428)	at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspx_meth_c_choose_0(pluto_002ddefault_002dtheme_jsp.java:296)	at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspService(pluto_002ddefault_002dtheme_jsp.java:153)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)	at org.apache.pluto.driver.PortalDriverServlet.doGet(PortalDriverServlet.java:151)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:419)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Thread.java:595)