HTTP Status 500 – Internal Server Error


Type Exception Report

Message Request processing failed; nested exception is java.lang.IllegalStateException: getOutputStream() has already been called for this response

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: getOutputStream() has already been called for this response
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:97)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

Root Cause

java.lang.IllegalStateException: getOutputStream() has already been called for this response
	org.apache.catalina.connector.Response.getWriter(Response.java:585)
	org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:211)
	org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:354)
	org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:187)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1394)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1139)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1078)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:961)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:97)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

Note The full stack trace of the root cause is available in the server logs.


Apache Tomcat/8.5.57