Apache Struts API Documentation: Class RedeployableActionServlet

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org.apache.struts.actions Class RedeployableActionServlet

java.lang.Object
  |
  +--javax.servlet.GenericServlet
        |
        +--javax.servlet.http.HttpServlet
              |
              +--org.apache.struts.action.ActionServlet
                    |
                    +--org.apache.struts.actions.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: 54954 $ $Date: 2004-10-17 07:40:12 +0100 (Sun, 17 Oct 2004) $
See Also:: Serialized Form

Field Summary
`private TilesRequestProcessor`	`tileProcessor`

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

config, configDigester, convertNull, dataSources, internal, internalName, log, processor, registrations, servletMapping, servletName

Fields inherited from class javax.servlet.http.HttpServlet

HEADER_IFMODSINCE, HEADER_LASTMOD, LSTRING_FILE, lStrings, METHOD_DELETE, METHOD_GET, METHOD_HEAD, METHOD_OPTIONS, METHOD_POST, METHOD_PUT, METHOD_TRACE

Constructor Summary
`RedeployableActionServlet()`

Method Summary
`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

addRuleSets, addServletMapping, destroy, destroyConfigDigester, destroyInternal, destroyModules, doGet, doPost, getInternal, getModuleConfig, getProcessorForModule, handleConfigException, init, initConfigDigester, initInternal, initModuleConfig, initModuleConfigFactory, initModuleDataSources, initModuleMessageResources, initModulePlugIns, initModulePrefixes, initOther, initServlet, isValidating, parseModuleConfigFile, process

Methods inherited from class javax.servlet.http.HttpServlet

, doDelete, doHead, doOptions, doPut, doTrace, getAllDeclaredMethods, getLastModified, maybeSetLastModified, 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, registerNatives, toString, wait, wait, wait

Field Detail

tileProcessor

private TilesRequestProcessor tileProcessor

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

Following copied from class: org.apache.struts.action.ActionServlet

Parameters:: config - The module configuration for which to acquire and return a RequestProcessor.
Throws:: javax.servlet.ServletException - if we cannot instantiate a RequestProcessor instance