struts-config.xml plugin problem...

Alan Treece Wed, 19 Apr 2006 14:17:09 -0700

Many thanks for those that have replied to my earlier emails forhelp... Hopefully once I get this one figured out I'll be on the wayto getting my perl to Struts conversion complete... FYI... I've takenthe time to migrate from Struts v1.1 to v1.2.9 so this issue isbased on that code base.

Part of the app I'm converting already had some Java/Struts v1.1code. Some of that code included some custom plugins which worked asexpected with v1.1. Here's the snippet from the struts-config.xmlfile that defines a plugin:


   <plug-in className="com.sun.myPlugin.plugins.LoggingPlugin">
      <set-property property="logging.config.file"
                    value="/WEB-INF/classes/logging-config.xml"/>
   </plug-in>


Here's the actual custom plugin:


package com.sun.myPlugin.plugins;

import org.apache.struts.action.PlugIn;
import org.apache.struts.config.PlugInConfig;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.impl.ModuleConfigImpl;
import javax.servlet.ServletException;
import javax.xml.parsers.FactoryConfigurationError;

import org.apache.log4j.Logger;
import org.apache.log4j.LogManager;
import org.apache.log4j.xml.DOMConfigurator;

/**

* Plugin for initializing logging for the SS-CDS implementation. Willconfigure

* logging for the entire VM for a given logging API implementation.
*/
public abstract class LoggingPlugin implements PlugIn {

private final static String DEFAULT_CONFIG_FILE = "/sso/myPlugin6/WEB-INF/classes/logging-config.xml";

    private final Logger log_ = LogManager.getLogger(getClass());

    /** Creates a new instance of LoggingPlugin */
    public LoggingPlugin() {
    }
    /**

* Attempt to finalize the logging component before systemshutdown. Basically* we're trying to get complete log files before shutdown. Inthe case of* an XMLFormatter, this is necessary to try to get complete XMLoutput in

     * the log file. Will help with reading the log file output.
     */
    public void destroy() {
        log_.info("Finalizing log4j.");
        try {
            // attempt to finalize logging
            LogManager.shutdown();
        }
        catch (Exception ignore) {
            // unable to finalize logging, may have
            // corrupt or incomplete log files
        }
    }
    /**

* Initialize the plugin. Reads the configuration file from thefile system

     * and attempts to configure log4j using that file.
     */

public void init(ActionServlet actionServlet, ModuleConfigImplapplicationConfig) throws ServletException {

        log_.info(" start initializing the Log4j");

        //get the log configuration file
        PlugInConfig[] configs = applicationConfig.findPlugInConfigs();
        String configFile = DEFAULT_CONFIG_FILE;
        // obtain the configuration file information from the plug-in

// if no file is defined, an error will be generated andlogging will not

        // be configured for this system.

// See the Struts Configuration file (struts-config.xml) andthe struts// api documentation for instructions on how to defineplugins and

        // properties on plugins.
        for(int i = 0; i < configs.length; i ++) {

if(configs[i].getClassName().equals(this.getClass().getName())) {configFile = (String)configs[i].getProperties().get("logging.config.file");

            }
        }
        if (configFile == null || configFile.length() ==0) {

String msg = "log configuration file name (" +configFile + ") is not in configuration file";

            log_.fatal(msg);
            throw new ServletException(msg);
        }
        //get the real path by concatenating the web xml directory

String fullName = actionServlet.getServletContext().getRealPath("/") + configFile;


        //Configure log4j
        try {
            DOMConfigurator.configure(fullName);
        }
        catch( FactoryConfigurationError fce) {
            System.out.println("Unable to configure log4j error is");
            fce.printStackTrace(System.out);
            throw new ServletException("DOMConfiguration failed");
        }
        log_.info(" finished initializing the Log4j");
    }
}


And here's the error(s) when starting the app:


failure: WEB2798: [] ServletContext.log(): action: null
java.lang.InstantiationException

atsun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)at java.lang.reflect.Constructor.newInstance(Constructor.java:274)

        at java.lang.Class.newInstance0(Class.java:308)
        at java.lang.Class.newInstance(Class.java:261)

at org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:143)at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:846)at org.apache.struts.action.ActionServlet.init(ActionServlet.java:336)

        at javax.servlet.GenericServlet.init(GenericServlet.java:256)

at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:921)at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:813)at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3478)at org.apache.catalina.core.StandardContext.start(StandardContext.java:3760)

        at com.iplanet.ias.web.WebModule.start(WebModule.java:251)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)at org.apache.catalina.core.StandardHost.start(StandardHost.java:652)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:355)at org.apache.catalina.startup.Embedded.start(Embedded.java:995)at com.iplanet.ias.web.WebContainer.start(WebContainer.java:431)at com.iplanet.ias.web.WebContainer.startInstance(WebContainer.java:500)at com.iplanet.ias.server.J2EERunner.confPostInit(J2EERunner.java:161)

warning: StandardWrapper[:action]: WEB2795: Marking servlet action asunavailable

failure: WebModule[]: WEB2783: Servlet  threw load() exception
javax.servlet.UnavailableException

at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:880)at org.apache.struts.action.ActionServlet.init(ActionServlet.java:336)

        at javax.servlet.GenericServlet.init(GenericServlet.java:256)

        at com.iplanet.ias.web.WebModule.start(WebModule.java:251)

I found a Struts web site earlier that talks about migrating todifferent versions, but I'll need to track it down again. Once I findit I'll start reading there to seed if there is something concerningthis. But, any pointers this fine alias could pass on would beappreciated.



Thanks, ajTreece


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struts-config.xml plugin problem...

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