title: Cannot call sendError() after the response has been committed
body: <p>I have the following filter:</p>
  
  <pre><code>public class IPFilter extends GenericFilterBean {
      @Override
      public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
          if ("/api/v1/auth/user".equals(((HttpServletRequest) request).getRequestURI())) {
               //skip
              chain.doFilter(request, response);
          }
          ...
      }
      ...
  }
  </code></pre>
  
  <p>After I've added <code>if</code> I see </p>
  
  <pre><code>2017-06-08 20:09:54,150 INFO com.finvale.controllers.AuthController.me:93 - Get me [org.springframework.security.oauth2.provider.OAuth2Authentication@474166d5: Principal: ADMIN_1; Credentials: [PROTECTED]; Authenticated: true; Details: remoteAddress=127.0.0.1, tokenType=BearertokenValue=&lt;TOKEN&gt;; Granted Authorities: ROLE_CONSUMER, ROLE_ADMINISTRATOR, ROLE_PROVIDER]
  2017-06-08 20:09:54,154 ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet].log:181 - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
  java.lang.IllegalStateException: Cannot call sendError() after the response has been committed
      at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:456)
      at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
      at org.springframework.session.web.http.OnCommittedResponseWrapper.sendError(OnCommittedResponseWrapper.java:116)
      at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
      at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
      at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
      at org.springframework.security.web.util.OnCommittedResponseWrapper.sendError(OnCommittedResponseWrapper.java:119)
      at com.finvale.auth.IPFilter.doFilter(IPFilter.java:70)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:108)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
      at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
      at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:176)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
      at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
      at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
      at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.security.oauth2.client.filter.OAuth2ClientContextFilter.doFilter(OAuth2ClientContextFilter.java:60)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167)
      at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      at java.lang.Thread.run(Thread.java:745)
  2017-06-08 20:09:54,158 DEBUG com.finvale.config.ApiRequestMappingHandlerMapping.getHandlerInternal:310 - Looking up handler method for path /error
  2017-06-08 20:09:54,159 DEBUG com.finvale.config.ApiRequestMappingHandlerMapping.getHandlerInternal:317 - Returning handler method [public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)]
  2017-06-08 20:09:54,164 ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet].log:181 - Servlet.service() for servlet dispatcherServlet threw exception
  java.lang.IllegalStateException: getOutputStream() has already been called for this response
      at org.apache.catalina.connector.Response.getWriter(Response.java:609)
      at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:211)
      at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109)
      at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109)
      at org.springframework.session.web.http.OnCommittedResponseWrapper.getWriter(OnCommittedResponseWrapper.java:149)
      at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109)
      at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109)
      at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:109)
      at org.springframework.security.web.util.OnCommittedResponseWrapper.getWriter(OnCommittedResponseWrapper.java:149)
      at org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView.render(ErrorMvcAutoConfiguration.java:227)
      at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1282)
      at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
      at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
      at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at com.finvale.auth.IPFilter.doFilter(IPFilter.java:56)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
      at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
      at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:84)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:176)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
      at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
      at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
      at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
      at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.security.oauth2.client.filter.OAuth2ClientContextFilter.doFilter(OAuth2ClientContextFilter.java:60)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167)
      at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:726)
      at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:592)
      at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:526)
      at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:389)
      at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:254)
      at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:349)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:175)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p>What did I wrong ?</p>