Java tutorial
/** * Copyright (C) 2009 Rutgers, the State University of New Jersey. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.inspektr.error.web; import java.io.IOException; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.inspektr.error.ErrorLogManager; import org.springframework.web.filter.OncePerRequestFilter; /** * Spring manageable bean implementing the <code>javax.servlet.Filter</code> * interface. This filter should be configured as the top of the web application's * filter chain and will record any uncaught exceptions from the chain using * the configured {@link org.inspektr.error.ErrorLogManager}. * To take advantage of Spring dependency injection, * this bean can be specified as the target of a <code>DelegatingFilterProxy</code>. * * @author lleung * @version $Revision: 1.2 $ $Date: 2007/07/11 20:48:46 $ * @since 1.0 */ public class ErrorLoggingFilter extends OncePerRequestFilter { private ErrorLogManager errorLogManager; protected void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response, final FilterChain filterChain) throws ServletException, IOException { try { filterChain.doFilter(request, response); } catch (ServletException e) { this.errorLogManager.recordError(e); throw e; } catch (IOException e) { this.errorLogManager.recordError(e); throw e; } catch (Throwable t) { this.errorLogManager.recordError(t); throw new ServletException(t); } } public void setErrorLogManager(final ErrorLogManager errorlogManager) { this.errorLogManager = errorlogManager; } }