package org.apache.turbine;
   
   /* ====================================================================
    * The Apache Software License, Version 1.1
    *
    * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
    * reserved.
    *
    * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. 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.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Turbine" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Turbine", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
   * ITS 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.configuration.Configuration;
  import org.apache.commons.configuration.ConfigurationFactory;
  import org.apache.commons.configuration.PropertiesConfiguration;
  
  import org.apache.commons.lang.StringUtils;
  
  import org.apache.commons.lang.exception.ExceptionUtils;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import org.apache.commons.xo.Mapper;
  
  import org.apache.log4j.PropertyConfigurator;
  
  import org.apache.turbine.modules.PageLoader;
  import org.apache.turbine.pipeline.DefaultPipelineData;
  import org.apache.turbine.pipeline.Pipeline;
  import org.apache.turbine.pipeline.PipelineData;
  import org.apache.turbine.pipeline.TurbinePipeline;
  
  import org.apache.turbine.services.ServiceManager;
  import org.apache.turbine.services.TurbineServices;
  import org.apache.turbine.services.avaloncomponent.AvalonComponentService;
  import org.apache.turbine.services.component.ComponentService;
  import org.apache.turbine.services.template.TemplateService;
  import org.apache.turbine.services.template.TurbineTemplate;
  import org.apache.turbine.services.rundata.RunDataService;
 import org.apache.turbine.services.rundata.TurbineRunDataFacade;
 
 import org.apache.turbine.util.RunData;
 import org.apache.turbine.util.ServerData;
 import org.apache.turbine.util.TurbineConfig;
 import org.apache.turbine.util.TurbineException;
 import org.apache.turbine.util.uri.URIConstants;
 
 /***
  * Turbine is the main servlet for the entire system. It is <code>final</code>
  * because you should <i>not</i> ever need to subclass this servlet.  If you
  * need to perform initialization of a service, then you should implement the
  * Services API and let your code be initialized by it.
  * If you need to override something in the <code>doGet()</code> or
  * <code>doPost()</code> methods, edit the TurbineResources.properties file and
  * specify your own classes there.
  * <p>
  * Turbine servlet recognizes the following initialization parameters.
  * <ul>
  * <li><code>properties</code> the path to TurbineResources.properties file
  * used by the default implementation of <code>ResourceService</code>, relative
  * to the application root.</li>
  * <li><code>basedir</code> this parameter is used <strong>only</strong> if your
  * application server does not support web applications, or the or does not
  * support <code>ServletContext.getRealPath(String)</code> method correctly.
  * You can use this parameter to specify the directory within the server's
  * filesystem, that is the base of your web application.</li>
  * </ul>
  *
  * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
  * @author <a href="mailto:bmclaugh@algx.net">Brett McLaughlin</a>
  * @author <a href="mailto:greg@shwoop.com">Greg Ritter</a>
  * @author <a href="mailto:john.mcnally@clearink.com">John D. McNally</a>
  * @author <a href="mailto:frank.kim@clearink.com">Frank Y. Kim</a>
  * @author <a href="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
  * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
  * @author <a href="mailto:sean@informage.net">Sean Legassick</a>
  * @author <a href="mailto:mpoeschl@marmot.at">Martin Poeschl</a>
  * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
  * @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a>
  * @author <a href="mailto:epugh@upstate.com">Eric Pugh</a>
  * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
  * @version $Id: Turbine.java,v 1.51 2004/08/02 08:57:36 epugh Exp $
  */
 public class Turbine
         extends HttpServlet
         implements TurbineConstants
 {
     /***
      * Name of path info parameter used to indicate the redirected stage of
      * a given user's initial Turbine request
      */
     public static final String REDIRECTED_PATHINFO_NAME = "redirected";
 
     /*** The base directory key */
     public static final String BASEDIR_KEY = "basedir";
 
     /***
      * In certain situations the init() method is called more than once,
      * somtimes even concurrently. This causes bad things to happen,
      * so we use this flag to prevent it.
      */
     private static boolean firstInit = true;
     
 	/***
 	 * The pipeline to use when processing requests.
 	 */
 	private static Pipeline pipeline = null;
 
     /*** Whether init succeeded or not. */
     private static Throwable initFailure = null;
 
     /***
      * Should initialization activities be performed during doGet() execution?
      */
     private static boolean firstDoGet = true;
 
     /***
      * Keep all the properties of the web server in a convenient data
      * structure
      */
     private static ServerData serverData = null;
 
     /*** The base from which the Turbine application will operate. */
     private static String applicationRoot;
 
     /*** Servlet config for this Turbine webapp. */
     private static ServletConfig servletConfig;
 
     /*** Servlet context for this Turbine webapp. */
     private static ServletContext servletContext;
 
     /***
      * The webapp root where the Turbine application
      * is running in the servlet container.
      * This might differ from the application root.
      */
     private static String webappRoot;
 
     /*** Our internal configuration object */
     private static Configuration configuration = null;
 
     /*** A reference to the Template Service */
     private TemplateService templateService = null;
 
     /*** A reference to the RunData Service */
     private RunDataService rundataService = null;
 
     /*** Logging class from commons.logging */
     private static Log log = LogFactory.getLog(Turbine.class);
 
     /***
      * This init method will load the default resources from a
      * properties file.
      *
      * This method is called by init(ServletConfig config)
      *
      * @exception ServletException a servlet exception.
      */
     public final void init() throws ServletException
     {
         synchronized (this.getClass())
         {
             super.init();
             ServletConfig config = getServletConfig();
 
             if (!firstInit)
             {
                 log.info("Double initialization of Turbine was attempted!");
                 return;
             }
             // executing init will trigger some static initializers, so we have
             // only one chance.
             firstInit = false;
 
             try
             {
                 ServletContext context = config.getServletContext();
 
                 configure(config, context);
 
                 templateService = TurbineTemplate.getService();
                 rundataService = TurbineRunDataFacade.getService();
 
                 if (rundataService == null)
                 {
                     throw new TurbineException(
                             "No RunData Service configured!");
                 }
 
             }
             catch (Exception e)
             {
                 // save the exception to complain loudly later :-)
                 initFailure = e;
                 log.fatal("Turbine: init() failed: ", e);
                 throw new ServletException("Turbine: init() failed", e);
             }
             log.info("Turbine: init() Ready to Rumble!");
         }
     }
 
     /***
      * Read the master configuration file in, configure logging
      * and start up any early services.
      *
      * @param config The Servlet Configuration supplied by the container
      * @param context The Servlet Context supplied by the container
      *
      * @throws Exception A problem occured while reading the configuration or performing early startup
      */
 
     private void configure(ServletConfig config, ServletContext context)
             throws Exception
     {
 
         // Set the application root. This defaults to the webapp
         // context if not otherwise set. This is to allow 2.1 apps
         // to be developed from CVS. This feature will carry over
         // into 3.0.
         applicationRoot = findInitParameter(context, config,
                 APPLICATION_ROOT_KEY,
                 APPLICATION_ROOT_DEFAULT);
 
         webappRoot = config.getServletContext().getRealPath("/");
         // log.info("Web Application root is " + webappRoot);
         // log.info("Application root is "     + applicationRoot);
 
         if (applicationRoot == null || applicationRoot.equals(WEB_CONTEXT))
         {
             applicationRoot = webappRoot;
             // log.info("got empty or 'webContext' Application root. Application root now: " + applicationRoot);
         }
 
         // Set the applicationRoot for this webapp.
         setApplicationRoot(applicationRoot);
 
         // Create any directories that need to be setup for
         // a running Turbine application.
         createRuntimeDirectories(context, config);
 
         //
         // Now we run the Turbine configuration code. There are two ways
         // to configure Turbine:
         //
         // a) By supplying an web.xml init parameter called "configuration"
         //
         // <init-param>
         //   <param-name>configuration</param-name>
         //   <param-value>/WEB-INF/conf/turbine.xml</param-value>
         // </init-param>
         //
         // This loads an XML based configuration file.
         //
         // b) By supplying an web.xml init parameter called "properties"
         //
         // <init-param>
         //   <param-name>properties</param-name>
         //   <param-value>/WEB-INF/conf/TurbineResources.properties</param-value>
         // </init-param>
         //
         // This loads a Properties based configuration file. Actually, these are
         // extended properties as provided by commons-configuration
         //
         // If neither a) nor b) is supplied, Turbine will fall back to the
         // known behaviour of loading a properties file called
         // /WEB-INF/conf/TurbineResources.properties relative to the
         // web application root.
 
         String confFile= findInitParameter(context, config, 
                 TurbineConfig.CONFIGURATION_PATH_KEY, 
                 null);
 
         String confPath;
         String confStyle = "unset";
 
         if (StringUtils.isNotEmpty(confFile))
         {
             confPath = getRealPath(confFile);
             ConfigurationFactory configurationFactory = new ConfigurationFactory(confPath);
             configurationFactory.setBasePath(getApplicationRoot());
             configuration = configurationFactory.getConfiguration();
             confStyle = "XML";
         }
         else
         {
             confFile = findInitParameter(context, config,
                     TurbineConfig.PROPERTIES_PATH_KEY,
                     TurbineConfig.PROPERTIES_PATH_DEFAULT);
 
             confPath = getRealPath(confFile);
 
             // This should eventually be a Configuration
             // interface so that service and app configuration
             // can be stored anywhere.
             configuration = (Configuration) new PropertiesConfiguration(confPath);
             confStyle = "Properties";
         }
 
 
         //
         // Set up logging as soon as possible
         //
         String log4jFile = configuration.getString(LOG4J_CONFIG_FILE,
                                                    LOG4J_CONFIG_FILE_DEFAULT);
 
         log4jFile = getRealPath(log4jFile);
 
         //
         // Load the config file above into a Properties object and
         // fix up the Application root
         //
         Properties p = new Properties();
         try
         {
             p.load(new FileInputStream(log4jFile));
             p.setProperty(APPLICATION_ROOT_KEY, getApplicationRoot());
             PropertyConfigurator.configure(p);
 
             //
             // Rebuild our log object with a configured commons-logging
             log = LogFactory.getLog(this.getClass());
 
             log.info("Configured log4j from " + log4jFile);
         }
         catch (FileNotFoundException fnf)
         {
             System.err.println("Could not open Log4J configuration file "
                                + log4jFile + ": ");
             fnf.printStackTrace();
         }
 
         // Now report our successful configuration to the world
         log.info("Loaded configuration  (" + confStyle + ") from " + confFile + " (" + confPath + ")");
 
         
         setTurbineServletConfig(config);
         setTurbineServletContext(context);
 
         getServiceManager().setApplicationRoot(applicationRoot);
 
         // We want to set a few values in the configuration so
         // that ${variable} interpolation will work for
         //
         // ${applicationRoot}
         // ${webappRoot}
         configuration.setProperty(APPLICATION_ROOT_KEY, applicationRoot);
         configuration.setProperty(WEBAPP_ROOT_KEY, webappRoot);
 
         
 
 		// Retrieve the pipeline class and then initialize it.  The pipeline
         // handles the processing of a webrequest/response cycle.
 	    Class pipelineClass =
 		  Class.forName(
 			  configuration.getString("pipeline.default", STANDARD_PIPELINE));
   
 		    log.debug("Using Pipeline: " + pipelineClass.getName());
 	    // Turbine's standard Pipeline implementation uses
 	    // descriptors to define what Valves are attached to it.
 	    String descriptorPath =
 		  	configuration.getString(
 			  "pipeline.default.descriptor",
 					  TurbinePipeline.CLASSIC_PIPELINE);
   		  	descriptorPath = getRealPath(descriptorPath);
   
   		  	log.debug("Using descriptor path: " + descriptorPath);
 	  	Mapper m = new Mapper();
 	  	pipeline = (Pipeline) m.map(descriptorPath, pipelineClass.getName());
 	  	log.debug("Initializing pipeline");
 	  
 	  	pipeline.initialize();
 
         
         //
         // Be sure, that our essential services get run early
         //
         configuration.setProperty(TurbineServices.SERVICE_PREFIX +
                                   ComponentService.SERVICE_NAME + ".earlyInit",
                                   Boolean.TRUE);
 
         configuration.setProperty(TurbineServices.SERVICE_PREFIX +
                                   AvalonComponentService.SERVICE_NAME + ".earlyInit",
                                   Boolean.TRUE);
 
         getServiceManager().setConfiguration(configuration);
 
         // Initialize the service manager. Services
         // that have its 'earlyInit' property set to
         // a value of 'true' will be started when
         // the service manager is initialized.
         getServiceManager().init();
     }
 
     /***
      * Create any directories that might be needed during
      * runtime. Right now this includes:
      *
      * <ul>
      *
      * <li>The directory to write the log files to (relative to the
      * web application root), or <code>null</code> for the default of
      * <code>/logs</code>.  The directory is specified via the {@link
      * TurbineConstants#LOGGING_ROOT} parameter.</li>
      *
      * </ul>
      *
      * @param context Global initialization parameters.
      * @param config Initialization parameters specific to the Turbine
      * servlet.
      */
     private static void createRuntimeDirectories(ServletContext context,
                                                  ServletConfig config)
     {
         String path = findInitParameter(context, config,
                                         LOGGING_ROOT_KEY,
                                         LOGGING_ROOT_DEFAULT);
 
         File logDir = new File(getRealPath(path));
         if (!logDir.exists())
         {
             // Create the logging directory
             if (!logDir.mkdirs())
             {
                 System.err.println("Cannot create directory for logs!");
             }
         }
     }
 
     /***
      * Finds the specified servlet configuration/initialization
      * parameter, looking first for a servlet-specific parameter, then
      * for a global parameter, and using the provided default if not
      * found.
      */
     protected static final String findInitParameter(ServletContext context,
             ServletConfig config, String name, String defaultValue)
     {
         String path = null;
 
         // Try the name as provided first.
         boolean usingNamespace = name.startsWith(CONFIG_NAMESPACE);
         while (true)
         {
             path = config.getInitParameter(name);
             if (StringUtils.isEmpty(path))
             {
                 path = context.getInitParameter(name);
                 if (StringUtils.isEmpty(path))
                 {
                     // The named parameter didn't yield a value.
                     if (usingNamespace)
                     {
                         path = defaultValue;
                     }
                     else
                     {
                         // Try again using Turbine's namespace.
                         name = CONFIG_NAMESPACE + '.' + name;
                         usingNamespace = true;
                         continue;
                     }
                 }
             }
             break;
         }
 
         return path;
     }
 
     /***
      * Return the current configuration with all keys included
      *
      * @return a Configuration Object
      */
     public static Configuration getConfiguration()
     {
         return configuration;
     }
 
     /***
      * Return the server name.
      *
      * @return String server name
      */
     public static String getServerName()
     {
         return getDefaultServerData().getServerName();
     }
 
     /***
      * Return the server scheme.
      *
      * @return String server scheme
      */
     public static String getServerScheme()
     {
         return getDefaultServerData().getServerScheme();
     }
 
     /***
      * Return the server port.
      *
      * @return String server port
      */
     public static String getServerPort()
     {
         return Integer.toString(getDefaultServerData().getServerPort());
     }
 
     /***
      * Get the script name. This is the initial script name.
      * Actually this is probably not needed any more. I'll
      * check. jvz.
      *
      * @return String initial script name.
      */
     public static String getScriptName()
     {
         return getDefaultServerData().getScriptName();
     }
 
     /***
      * Return the context path.
      *
      * @return String context path
      */
     public static String getContextPath()
     {
         return getDefaultServerData().getContextPath();
     }
 
     /***
      * Return all the Turbine Servlet information (Server Name, Port,
      * Scheme in a ServerData structure. This is generated from the
      * values set when initializing the Turbine and may not be correct
      * if you're running in a clustered structure. This might be used
      * if you need a DataURI and have no RunData object handy-
      *
      * @return An initialized ServerData object
      */
     public static ServerData getDefaultServerData()
     {
         if(serverData == null)
         {
             log.error("ServerData Information requested from Turbine before first request!");
             // Will be overwritten once the first request is run;
             serverData = new ServerData(null, URIConstants.HTTP_PORT,
                     URIConstants.HTTP, null, null);
         }
         return serverData;
     }
 
     /***
      * Set the servlet config for this turbine webapp.
      *
      * @param config New servlet config
      */
     public static void setTurbineServletConfig(ServletConfig config)
     {
         servletConfig = config;
     }
 
     /***
      * Get the servlet config for this turbine webapp.
      *
      * @return ServletConfig
      */
     public static ServletConfig getTurbineServletConfig()
     {
         return servletConfig;
     }
 
     /***
      * Set the servlet context for this turbine webapp.
      *
      * @param context New servlet context.
      */
     public static void setTurbineServletContext(ServletContext context)
     {
         servletContext = context;
     }
 
     /***
      * Get the servlet context for this turbine webapp.
      *
      * @return ServletContext
      */
     public static ServletContext getTurbineServletContext()
     {
         return servletContext;
     }
 
     /***
      * The <code>Servlet</code> destroy method.  Invokes
      * <code>ServiceBroker</code> tear down method.
      */
     public final void destroy()
     {
         // Shut down all Turbine Services.
         getServiceManager().shutdownServices();
         System.gc();
 
         firstInit = true;
         firstDoGet = true;
         log.info("Turbine: Done shutting down!");
     }
 
     /***
      * The primary method invoked when the Turbine servlet is executed.
      *
      * @param req Servlet request.
      * @param res Servlet response.
      * @exception IOException a servlet exception.
      * @exception ServletException a servlet exception.
      */
     public final void doGet(HttpServletRequest req, HttpServletResponse res)
             throws IOException, ServletException
     {
         // set to true if the request is to be redirected by the page
         boolean requestRedirected = false;
 
         // Placeholder for the RunData object.
         RunData data = null;
         
         PipelineData pipelineData = new DefaultPipelineData();
         try
         {
             // Check to make sure that we started up properly.
             if (initFailure != null)
             {
                 throw initFailure;
             }
             // If this is the first invocation, perform some
             // initialization.  Certain services need RunData to initialize
             // themselves.
             if (firstDoGet)
             {
                 synchronized (Turbine.class)
                 {
                     // Store the context path for tools like ContentURI and
                     // the UIManager that use webapp context path information
                     // for constructing URLs.
                     serverData = new ServerData(req);            
 
                     // Mark that we're done.
                     firstDoGet = false;
                     log.info("Turbine: first Request successful");
                 }
 
             }            
 
             // Get general RunData here...
             // Perform turbine specific initialization below.
             data = rundataService.getRunData(req, res, getServletConfig());
             Map runDataMap = new HashMap();
             runDataMap.put(RunData.class, data);
             // put the data into the pipeline
             pipelineData.put(RunData.class, runDataMap);            
 
             // Stages of Pipeline implementation execution
 			// configurable via attached Valve implementations in a
 			// XML properties file.
 			pipeline.invoke(pipelineData);
   
         }
         catch (Exception e)
         {
             handleException(pipelineData, res, e);
         }
         catch (Throwable t)
         {
             handleException(pipelineData, res, t);
         }
         finally
         {
             // Return the used RunData to the factory for recycling.
             rundataService.putRunData(data);
         }
     }
 
     /***
      * In this application doGet and doPost are the same thing.
      *
      * @param req Servlet request.
      * @param res Servlet response.
      * @exception IOException a servlet exception.
      * @exception ServletException a servlet exception.
      */
     public final void doPost(HttpServletRequest req, HttpServletResponse res)
             throws IOException, ServletException
     {
         doGet(req, res);
     }
 
     /***
      * Return the servlet info.
      *
      * @return a string with the servlet information.
      */
     public final String getServletInfo()
     {
         return "Turbine Servlet";
     }
 
     /***
      * This method is about making sure that we catch and display
      * errors to the screen in one fashion or another. What happens is
      * that it will attempt to show the error using your user defined
      * Error Screen. If that fails, then it will resort to just
      * displaying the error and logging it all over the place
      * including the servlet engine log file, the Turbine log file and
      * on the screen.
      *
      * @param data A Turbine PipelineData object.
      * @param res Servlet response.
      * @param t The exception to report.
      */
     private final void handleException(PipelineData pipelineData, HttpServletResponse res,
                                        Throwable t)
     {
         RunData data = (RunData)getRunData(pipelineData);
         // make sure that the stack trace makes it the log
         log.error("Turbine.handleException: ", t);
 
         String mimeType = "text/plain";
         try
         {
             // This is where we capture all exceptions and show the
             // Error Screen.
             data.setStackTrace(ExceptionUtils.getStackTrace(t), t);
 
             // setup the screen
             data.setScreen(configuration.getString(SCREEN_ERROR_KEY,
                     SCREEN_ERROR_DEFAULT));
 
             // do more screen setup for template execution if needed
             if (data.getTemplateInfo() != null)
             {
                 data.getTemplateInfo()
                     .setScreenTemplate(configuration.getString(
                             TEMPLATE_ERROR_KEY, TEMPLATE_ERROR_VM));
             }
 
             // Make sure to not execute an action.
             data.setAction("");
 
             PageLoader.getInstance().exec(pipelineData,
                     configuration.getString(PAGE_DEFAULT_KEY,
                             PAGE_DEFAULT_DEFAULT));
 
             data.getResponse().setContentType(data.getContentType());
             data.getResponse().setStatus(data.getStatusCode());
         }
         // Catch this one because it occurs if some code hasn't been
         // completely re-compiled after a change..
         catch (java.lang.NoSuchFieldError e)
         {
             try
             {
                 data.getResponse().setContentType(mimeType);
                 data.getResponse().setStatus(200);
             }
             catch (Exception ignored)
             {
             }
 
             try
             {
 				data.getResponse().getWriter().print("java.lang.NoSuchFieldError: "
                         + "Please recompile all of your source code.");
             }
             catch (IOException ignored)
             {
             }
 
             log.error(data.getStackTrace(), e);
         }
         // Attempt to do *something* at this point...
         catch (Throwable reallyScrewedNow)
         {
             StringBuffer msg = new StringBuffer();
             msg.append("Horrible Exception: ");
             if (data != null)
             {
                 msg.append(data.getStackTrace());
             }
             else
             {
                 msg.append(t);
             }
             try
             {
                 res.setContentType(mimeType);
                 res.setStatus(200);
                 res.getWriter().print(msg.toString());
             }
             catch (Exception ignored)
             {
             }
 
             log.error(reallyScrewedNow.getMessage(), reallyScrewedNow);
         }
     }
 
     /***
      * Set the application root for the webapp.
      *
      * @param val New app root.
      */
     public static void setApplicationRoot(String val)
     {
         applicationRoot = val;
     }
 
     /***
      * Get the application root for this Turbine webapp. This
      * concept was started in 3.0 and will allow an app to be
      * developed from a standard CVS layout. With a simple
      * switch the app will work fully within the servlet
      * container for deployment.
      *
      * @return String applicationRoot
      */
     public static String getApplicationRoot()
     {
         return applicationRoot;
     }
 
     /***
      * Used to get the real path of configuration and resource
      * information. This can be used by an app being
      * developed in a standard CVS layout.
      *
      * @param path path translated to the application root
      * @return the real path
      */
     public static String getRealPath(String path)
     {
         if (path.startsWith("/"))
         {
             path = path.substring(1);
         }
 
         return new File(getApplicationRoot(), path).getAbsolutePath();
     }
 
     /***
      * Return an instance of the currently configured Service Manager
      *
      * @return A service Manager instance
      */
     private ServiceManager getServiceManager()
     {
         return TurbineServices.getInstance();
     }
     
     /***
      * Get a RunData from the pipelineData. Once RunData is replaced
      * by PipelineData this should not be required. 
      * @param pipelineData
      * @return
      */
     private RunData getRunData(PipelineData pipelineData)
     {
         RunData data = null;
         Map runDataMap = (Map) pipelineData.get(RunData.class);
         data = (RunData)runDataMap.get(RunData.class);
         return data;
     }
 }