org.apache.struts.tiles

Class RedeployableActionServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.apache.struts.action.ActionServlet

org.apache.struts.tiles.RedeployableActionServlet

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class RedeployableActionServlet
extends ActionServlet

WebLogic (at least v6 and v7) attempts to serialize the TilesRequestProcessor when re-deploying the Webapp in development mode. The TilesRequestProcessor is not serializable, and loses the Tiles definitions. This results in NullPointerException and/or NotSerializableException when using the app after automatic redeploy.

This bug report proposes a workaround for this problem, in the hope it will help others and maybe motivate an actual fix.

The attached class extends the Struts Action servlet and fixes the problem by reloading the Tiles definitions when they have disappeared.

For background discussion see http://issues.apache.org/bugzilla/show_bug.cgi?id=26322

Since:

1.2.1

Version:

$Rev: 481833 $ $Date: 2006-12-03 11:32:52 -0600 (Sun, 03 Dec 2006) $

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.struts.action.ActionServlet

chainConfig, config, configDigester, convertNull, internal, internalName, log, registrations, servletMapping, servletName

Constructor Summary

Constructors

Constructor and Description
RedeployableActionServlet()

Method Summary

Modifier and Type	Method and Description
protected RequestProcessor	getRequestProcessor(ModuleConfig config) Look up and return the RequestProcessor responsible for the specified module, creating a new one if necessary.

Methods inherited from class org.apache.struts.action.ActionServlet

addServletMapping, destroy, destroyConfigDigester, destroyInternal, destroyModules, doGet, doPost, getInternal, getModuleConfig, init, initChain, initConfigDigester, initInternal, initModuleActions, initModuleConfig, initModuleConfigFactory, initModuleExceptionConfigs, initModuleFormBeans, initModuleForwards, initModuleMessageResources, initModulePlugIns, initModulePrefixes, initOther, initServlet, parseModuleConfigFile, parseModuleConfigFile, process, processActionConfigClass, processActionConfigExtension, processExceptionConfigClass, processExceptionExtension, processFormBeanConfigClass, processFormBeanExtension, processForwardConfigClass, processForwardExtension, splitAndResolvePaths

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RedeployableActionServlet

public RedeployableActionServlet()

Method Detail

getRequestProcessor

protected RequestProcessor getRequestProcessor(ModuleConfig config)
                                        throws javax.servlet.ServletException

Description copied from class: ActionServlet

Look up and return the RequestProcessor responsible for the specified module, creating a new one if necessary.

Overrides:

getRequestProcessor in class ActionServlet

Parameters:

config - The module configuration for which to acquire and return a RequestProcessor.

Returns:

The RequestProcessor responsible for the specified module,

Throws:

javax.servlet.ServletException - If we cannot instantiate a RequestProcessor instance a UnavailableException is thrown, meaning your application is not loaded and will not be available.