public Launcher(){ExtClassLoader extclassloader;try{extclassloader = ExtClassLoader.getExtClassLoader();}catch(IOException ioexception) {throw new InternalError("Could not create extension class loader");}try{loader = AppClassLoader.getAppClassLoader(extclassloader);}catch(IOException ioexception1){throw new InternalError("Could not create application class loader");}Thread.currentThread().setContextClassLoader(loader);String s = System.getProperty("java.security.manager");if(s != null){SecurityManager securitymanager = null;if("".equals(s) || "default".equals(s))securitymanager = new SecurityManager();elsetry{securitymanager = (SecurityManager)loader.loadClass(s).newInstance();}catch(IllegalAccessException illegalaccessexception) { }catch(InstantiationException instantiationexception) { }catch(ClassNotFoundException classnotfoundexception) { }catch(ClassCastException classcastexception) { }if(securitymanager != null)System.setSecurityManager(securitymanager);elsethrow new InternalError((new StringBuilder()).append("Could not create SecurityManager: ").append(s).toString());}}

public static ExtClassLoader getExtClassLoader()throws IOException{File afile[] = getExtDirs();return (ExtClassLoader)AccessController.doPrivileged(new PrivilegedExceptionAction(afile) {public Object run() throws IOException{int i = dirs.length;for(int j = 0; j < i; j++)MetaIndex.registerDirectory(dirs[j]);return new ExtClassLoader(dirs);}final File val$dirs[];{dirs = afile;super();}});PrivilegedActionException privilegedactionexception;privilegedactionexception;throw (IOException)privilegedactionexception.getException();}private static File[] getExtDirs(){String s = System.getProperty("java.ext.dirs");File afile[];if(s != null){StringTokenizer stringtokenizer = new StringTokenizer(s, File.pathSeparator);int i = stringtokenizer.countTokens();afile = new File[i];for(int j = 0; j < i; j++)afile[j] = new File(stringtokenizer.nextToken());} else{afile = new File[0];}return afile;}

public static ClassLoader getAppClassLoader(ClassLoader classloader) throws IOException{String s = System.getProperty("java.class.path");File afile[] = s != null ? Launcher.getClassPath(s) : new File[0];return (AppClassLoader)AccessController.doPrivileged(new PrivilegedAction(s, afile, classloader) {public Object run() {URL aurl[] = s != null ? Launcher.pathToURLs(path) : new URL[0];return new AppClassLoader(aurl, extcl);}final String val$s;final File val$path[];final ClassLoader val$extcl;{s = s1;path = afile;extcl = classloader;super();}});}

package com.jvm.study.classload;public class Test {public static void main(String... args) {ClassLoader loader = Test.class.getClassLoader();System.err.println("loader:"+loader);while (loader != null) {loader = loader.getParent();System.err.println("in while:"+loader);}}
}

protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {// First, check if the class has already been loadedClass c = findLoadedClass(name);if (c == null) {try {if (parent != null) {c = parent.loadClass(name, false);} else {c = findBootstrapClassOrNull(name);}} catch (ClassNotFoundException e) {// ClassNotFoundException thrown if class not found// from the non-null parent class loader
            }if (c == null) {// If still not found, then invoke findClass in order// to find the class.c = findClass(name);}}if (resolve) {resolveClass(c);}return c;}

package java.lang;/*** hack*/
public class Integer {public Integer(int value) {System.exit(0);}
}

        public static void main(String... args) {Integer i = new Integer(1);System.err.println(i);}