package org.apache.struts.actions;
import javax.servlet.ServletException;
import org.apache.struts.Globals;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.tiles.DefinitionsFactory;
import org.apache.struts.tiles.DefinitionsFactoryException;
import org.apache.struts.tiles.TilesRequestProcessor;
/**
* <p>
* 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.
* </p>
* <p>
* This bug report proposes a workaround for this problem, in the hope it will
* help others and maybe motivate an actual fix.
* </p>
* <p>
* The attached class extends the Struts Action servlet and fixes the problem by
* reloading the Tiles definitions when they have disappeared.
* </p>
* <p>
* For background discussion see
* http://issues.apache.org/bugzilla/show_bug.cgi?id=26322
* </p>
* @version $Revision: 1.1 $ $Date: 2004/06/24 23:38:16 $
* @since 1.2.1
*/
public class RedeployableActionServlet extends ActionServlet {
private TilesRequestProcessor tileProcessor;
protected synchronized org.apache.struts.action.RequestProcessor
getRequestProcessor(ModuleConfig config) throws ServletException {
if (tileProcessor != null) {
TilesRequestProcessor processor = (TilesRequestProcessor) super.getRequestProcessor(config);
return processor;
}
// reset the request processor
String requestProcessorKey = Globals.REQUEST_PROCESSOR_KEY +
config.getPrefix();
getServletContext().removeAttribute(requestProcessorKey);
// create a new request processor instance
TilesRequestProcessor processor = (TilesRequestProcessor) super.getRequestProcessor(config);
tileProcessor = processor;
try {
// reload Tiles defs
DefinitionsFactory factory = processor.getDefinitionsFactory();
factory.init(factory.getConfig(), getServletContext());
// System.out.println("reloaded tiles-definitions");
} catch (DefinitionsFactoryException e) {
e.printStackTrace();
}
return processor;
}
}