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java.lang.IllegalStateException: getOutputStream() has already been called for this response	at org.apache.catalina.connector.Response.getWriter(Response.java:633)	at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:214)	at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:105)	at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)	at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)	at org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:336)	at org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:353)	at org.apache.jsp.jsp.activity_jsp._jspService(activity_jsp.java:402)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530)	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:229)	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1265)	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1016)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:965)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:859)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:883)	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:792)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)