Java Security, 2nd Edition

Running Secure Applications

Now we can put this altogether and show the framework necessary to run the application. That framework is the following program:

package javasec.samples.appd; import java.lang.reflect.*; public class JavaRunner implements Runnable { final static int numArgs = 1; private JRClassLoader jrl; private Object args[]; private String className; JavaRunner(JRClassLoader jrl, String className, Object args[]) { this.jrl = jrl; this.className = className; this.args = args; } void invokeMain(Class clazz) { Class argList[] = new Class[1]; String strArray[] = new String[1]; argList[0] = strArray.getClass( ); Method mainMethod = null; try { mainMethod = clazz.getMethod("main", argList); } catch (NoSuchMethodException nsme) { System.out.println("No main method in " + clazz.getName( )); System.exit(-1); } try { mainMethod.invoke(null, args); } catch (Throwable e) { if (e instanceof InvocationTargetException) e = ((InvocationTargetException) e) .getTargetException( ); System.out.println("Procedure exited with exception " + e); e.printStackTrace( ); } } public void run( ) { Class target = null; try { target = jrl.loadClass(className); invokeMain(target); } catch (ClassNotFoundException cnfe) { System.out.println("Can't load " + className); } } static Object[] getArgs(String args[]) { String passArgs[] = new String[args.length - numArgs]; for (int i = numArgs; i < args.length; i++) passArgs[i - numArgs] = args[i]; Object wrapArgs[] = new Object[1]; wrapArgs[0] = passArgs; ...