internalerrorservlet.java

dspace 用j2ee架构的一个数字图书馆.开源程序

/*
 * InternalErrorServlet.java
 *
 * Version: $Revision: 1.5 $
 *
 * Date: $Date: 2005/04/20 14:22:37 $
 *
 * Copyright (c) 2002-2005, Hewlett-Packard Company and Massachusetts
 * Institute of Technology.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Hewlett-Packard Company nor the name of the
 * Massachusetts Institute of Technology nor the names of their
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package org.dspace.app.webui.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.dspace.app.webui.util.JSPManager;
import org.dspace.app.webui.util.UIUtil;

/**
 * Servlet for handling an internal server error
 * 
 * @author Robert Tansley
 * @version $Revision: 1.5 $
 */
public class InternalErrorServlet extends HttpServlet
{
    /*
     * We don't extend DSpaceServlet in case it's context creation etc. that
     * caused the problem!
     */

    /** log4j category */
    private static Logger log = Logger.getLogger(InternalErrorServlet.class);

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {
        // Get the exception that occurred, if any
        Throwable t = (Throwable) request
                .getAttribute("javax.servlet.error.exception");

        String logInfo = UIUtil.getRequestLogInfo(request);

        // Log the error. Since we don't have a context, we need to
        // build the info "by hand"
        String logMessage = ":session_id=" + request.getSession().getId()
                + ":internal_error:" + logInfo;

        log.warn(logMessage, t);

        // Now we try and mail the designated user, if any
        UIUtil.sendAlert(request, (Exception) t);

        JSPManager.showJSP(request, response, "/error/internal.jsp");
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {
        doGet(request, response);
    }
}