Error Handler Action

The source code for the DisplayURL portlet's ErrorHandler action class follows.

/** Copyright (c) 2003 by SAS Institute Inc., Cary, NC 27513.
 *  All Rights Reserved.
 */
package com.sas.portal.portlets.displayurl;

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

import com.sas.apps.portal.PortalException;
import com.sas.portal.Logger;
import com.sas.portal.portlet.ErrorHandlerInterface;
import com.sas.portal.portlet.NavigationUtil;
import com.sas.portal.portlet.PortletContext;

/**
 * Error handler for this portlet. It logs the exception and 
 * returns ErrorPage.jsp for the portlet to display.
 */
public class ErrorHandler implements ErrorHandlerInterface
{
  private final String _loggingContext = 
    this.getClass().getName();

  /**
   * Returns the URL for the portlet controller to call. 
   * This is the name of
   * the error page JSP.
   * @param request the HttpServletRequest
   * @param response the HttpServeltResponse
   * @param context the PortletContext
   * @param exception the exception thrown by a portlet action
   * @return the URL to call
   */
  public String service(HttpServletRequest request,
                        HttpServletResponse response,
                        PortletContext context,
                        Exception thrownException)
  {
      //prepare the localized resources for use by the jsp.
      try {
          NavigationUtil.prepareLocalizedResources(
             "com.sas.portal.portlets.displayurl.Resources",
             request, context);
      }
      catch (java.io.IOException ioe) {
          Logger.error(ioe.getMessage(), _loggingContext, ioe);
      }

      //send error to server log in default locale.
      Logger.error(thrownException.getMessage(), _loggingContext, 
          thrownException);

      //get msg in user's locale.
      String msg = null;
      try {
         PortalException ourException = (PortalException)
            thrownException;
         msg = 
		    ourException.getMessage(request.getLocale());
      }
      catch (ClassCastException cce){
         msg= "";
      }

      if (msg == null) {
         //prevent showing the word null in a JSP
         msg = "";
      }

      //make msg available for display on error jsp.
      context.setAttribute("Exception_message", msg);

      return (String)context.getAttribute("error-page");
  }
}