package org.jboss.book.jmx.ex0;import java.io.File;import java.net.URL;import java.net.URLClassLoader;import java.lang.reflect.Method;import org.apache.log4j.Logger;import org.jboss.util.ChapterExRepository;import org.jboss.util.Debug;/** * @author Scott.Stark@jboss.org * @version $Revision: 1.1 $ */public class ExCCEb{   public static void main(String[] args) throws Exception   {      ChapterExRepository.init(ExCCEb.class);      String chapDir = System.getProperty("chapter.dir");      Logger ucl0Log = Logger.getLogger("UCL0");      File jar0 = new File(chapDir+"/j0.jar");      ucl0Log.info("jar0 path: "+jar0.toString());      URL[] cp0 = {jar0.toURL()};      URLClassLoader ucl0 = new URLClassLoader(cp0);      Thread.currentThread().setContextClassLoader(ucl0);      Class ctxClass1 = ucl0.loadClass("org.jboss.book.jmx.ex0.ExCtx");      StringBuffer buffer = new StringBuffer("ExCtx Info");      Debug.displayClassInfo(ctxClass1, buffer, false);      ucl0Log.info(buffer.toString());      Object ctx0 = ctxClass1.newInstance();      Object value = null;      try      {         Class[] types = {};         Method getValue = ctxClass1.getMethod("getValue", types);         Object[] margs = {};         value = getValue.invoke(ctx0, margs);         buffer.setLength(0);         buffer.append("main.obj.CodeSource: ");         Debug.displayClassInfo(value.getClass(), buffer, false);         ucl0Log.info(buffer.toString());      }      catch(Exception e)      {         ucl0Log.error("Failed to invoke ExCtx.getValue", e);      }      File jar1 = new File(chapDir+"/j1.jar");      Logger ucl1Log = Logger.getLogger("UCL1");      ucl1Log.info("jar1 path: "+jar1.toString());      URL[] cp1 = {jar1.toURL()};      URLClassLoader ucl1 = new URLClassLoader(cp1);      Class ctxClass2 = ucl1.loadClass("org.jboss.book.jmx.ex0.ExCtx");      buffer.setLength(0);      buffer.append("ExCtx Info");      Debug.displayClassInfo(ctxClass2, buffer, false);      ucl1Log.info(buffer.toString());      Object ctx2 = ctxClass2.newInstance();      Thread.currentThread().setContextClassLoader(ucl1);      try      {         Class[] types = {Object.class};         Method useValue = ctxClass2.getMethod("useValue", types);         Object[] margs = {value};         useValue.invoke(ctx2, margs);      }      catch(Exception e)      {         ucl1Log.error("Failed to invoke ExCtx.useValue", e);         throw e;      }      try      {         Class[] types = {Object.class};         Method useValue = ctxClass2.getMethod("useValue", types);         Object[] margs = {value};         useValue.invoke(ctx2, margs);      }      catch(Exception e)      {         ucl1Log.error("Failed to invoke ExCtx.useValue", e);         throw e;      }   }}