The problem is your custom plugin is declared as abstract, so Struts can't
instantiate it:
---
public abstract class LoggingPlugin implements PlugIn {
---
Don
On 4/19/06, Alan Treece <[EMAIL PROTECTED]> wrote:
>
> Many thanks for those that have replied to my earlier emails for
> help... Hopefully once I get this one figured out I'll be on the way
> to getting my perl to Struts conversion complete... FYI... I've taken
> the time to migrate from Struts v1.1 to v1.2.9 so this issue is
> based on that code base.
>
> Part of the app I'm converting already had some Java/Struts v1.1
> code. Some of that code included some custom plugins which worked as
> expected with v1.1. Here's the snippet from the struts-config.xml
> file 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. Will
> configure
> * 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 system
> shutdown. Basically
> * we're trying to get complete log files before shutdown. In
> the case of
> * an XMLFormatter, this is necessary to try to get complete XML
> output 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 the
> file system
> * and attempts to configure log4j using that file.
> */
> public void init(ActionServlet actionServlet, ModuleConfigImpl
> applicationConfig) 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 and
> logging will not
> // be configured for this system.
> // See the Struts Configuration file (struts-config.xml) and
> the struts
> // api documentation for instructions on how to define
> plugins 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
> at
> sun.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 as
> unavailable
> 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 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)
>
>
> I found a Struts web site earlier that talks about migrating to
> different versions, but I'll need to track it down again. Once I find
> it I'll start reading there to seed if there is something concerning
> this. But, any pointers this fine alias could pass on would be
> appreciated.
>
>
> Thanks, ajTreece
>
>
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>
