code: /*
   * Computoser is a music-composition algorithm and a website to present the results
   * Copyright (C) 2012-2014  Bozhidar Bozhanov
   *
   * Computoser is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as
   * published by the Free Software Foundation, either version 3 of the
   * License, or (at your option) any later version.
   *
   * Computoser is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with Computoser.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.music.web.util;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Component;
  import org.springframework.web.servlet.HandlerExceptionResolver;
  import org.springframework.web.servlet.ModelAndView;
  
  @Component
  public class ExceptionResolver implements HandlerExceptionResolver {
  
      private static final Logger logger = LoggerFactory.getLogger(ExceptionResolver.class);
  
      @Override
      public ModelAndView resolveException(HttpServletRequest request,
              HttpServletResponse response, Object handler, Exception ex) {
  
          // the stacktrace will be printed by spring's DispatcherServlet
          // we are only logging the request url and headeres here
          logger.warn("An exception occurred when invoking the following URL: "
                  + request.getRequestURL() + " . Requester IP is "
                  + request.getRemoteAddr() + ", User-Agent: "
                  + request.getHeader("User-Agent") + "; Message=" + ex.getMessage() + ": " + ex.getStackTrace()[0].getMethodName());
  
          response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
          return null;
      }
  }
  