?? exccec.java
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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;/** An example of a ClassCastException that results from classes loaded through * different class loaders. * @author Scott.Stark@jboss.org * @version $Revision: 1.1 $ */public class ExCCEc{ public static void main(String[] args) throws Exception { ChapterExRepository.init(ExCCEc.class); String chapDir = System.getProperty("chapter.dir"); Logger ucl0Log = Logger.getLogger("UCL0"); // Load ExObj from j0.jar using URLClassLoader instance 0 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 objClass = ucl0.loadClass("org.jboss.book.jmx.ex0.ExObj"); StringBuffer buffer = new StringBuffer("ExObj Info"); Debug.displayClassInfo(objClass, buffer, false); ucl0Log.info(buffer.toString()); Object value = objClass.newInstance(); // Load ExCtx from j0.jar using URLClassLoader instance 1 File jar1 = new File(chapDir+"/j0.jar"); Logger ucl1Log = Logger.getLogger("UCL1"); ucl1Log.info("jar1 path: "+jar1.toString()); URL[] cp1 = {jar1.toURL()}; URLClassLoader ucl1 = new URLClassLoader(cp1); Thread.currentThread().setContextClassLoader(ucl1); 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(); try { // Invoke ExCtx[UCL1].useValue(value=ExObj[UCL0]) via reflection 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; } }}
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