ClassLoader 动态加载定义

static {
        try {
            AccessController.doPrivileged(new PrivilegedExceptionAction() {
            public Object run() throws Exception {
             Class cl = Class.forName("java.lang.ClassLoader"); 

            defineClass1 = cl.getDeclaredMethod("defineClass", new Class[]{

           String.class, byte[].class, int.class,  int.class});

            defineClass2 = cl.getDeclaredMethod("defineClass", new Class[]{

            String.class, byte[].class, int.class, int.class,ProtectionDomain.class}); 

            definePackage = cl.getDeclaredMethod("definePackage", new Class[]{

            String.class, String.class, String.class, String.class, String.class, String.class, String.class,

            java.net.URL.class});

            Field f = Unsafe.class.getDeclaredField("theUnsafe"); // Internal reference 

            f.setAccessible(true); 

            unSafe = (Unsafe) f.get(null); return null; }
            }); }

            catch (PrivilegedActionException pae) {
            throw new RuntimeException("cannot initialize ClassPool", pae.getException()); 

      }

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