org.tolven.web.servlet.InternalErrorHandleServlet.java Source code

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Here is the source code for org.tolven.web.servlet.InternalErrorHandleServlet.java

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/*
 *  Copyright (C) 2009 Tolven Inc 
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of 
 * the GNU Lesser General Public License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along with this 
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 
 * Boston, MA 02111-1307 USA 
 * 
 * Contact: info@tolvenhealth.com
 */
package org.tolven.web.servlet;

import java.io.IOException;

import javax.naming.InitialContext;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.Status;
import javax.transaction.UserTransaction;

import org.apache.commons.lang.StringUtils;
import org.tolven.core.TolvenRequest;
import org.tolven.core.entity.AccountUser;

/** This servlet will send an email when there is an error in the application(server side) 
 * if the email is configured in account preferences and then shows an error page.
 *   Note: This filter should be outside of the transaction filter scope - It uses an independent transaction context.
 * @author Srini Kandula
 */

public class InternalErrorHandleServlet extends HttpServlet {
    private ServletConfig config;
    private InitialContext ctx;

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //check if a transaction is already started, if not redirect to the servlet
        UserTransaction ut = null;
        try {
            ut = (UserTransaction) ctx.lookup("UserTransaction");
            if (ut.getStatus() != Status.STATUS_ACTIVE) {
                ut.begin();
            }
            //check if the error.email is configured. If found send an email
            Object accountUser = TolvenRequest.getInstance().getAccountUser();
            if (accountUser != null) {
                String errorEmail = ((AccountUser) accountUser).getAccount().getProperty()
                        .get("org.tolven.error.email.to");
                if (!StringUtils.isBlank(errorEmail)) {
                    System.out.println("Send an email to " + errorEmail);
                }
            }
            if (ut != null) {
                ut.commit();
            }
            RequestDispatcher dispatcher = this.config.getServletContext().getRequestDispatcher("/error.jsp");
            if (dispatcher != null)
                dispatcher.forward(req, resp);
        } catch (Exception e) {
            throw new ServletException("Exception thrown in InternalErrorHandleServlet", e);
        } finally {
            if (ut != null) {
                try {
                    ut.rollback();
                } catch (Exception e) {
                    throw new ServletException("Exception thrown in InternalErrorHandleServlet", e);
                }
            }
        }
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        this.config = config;
    }
}