SytstemClassLoader.java

import java.lang.reflect.Method;

public class SystemClassLoader {
  private static final Method defineClassMethod;

  public static Class<?> loadClass(String className, byte[] b) {
    // override classDefine (as it is protected) and define the class.
    Class<?> clazz = null;
    try {
      Object[] args = new Object[] { className, b, new Integer(0), new Integer(b.length) };
      clazz = (Class<?>) defineClassMethod.invoke(ClassLoader.getSystemClassLoader(), args);
    } catch (Exception e) {
      e.printStackTrace();
      System.exit(1);
    }
    return clazz;
  }

  static {
    Method localMethod;
    try {
      localMethod = java.lang.ClassLoader.class.getDeclaredMethod("defineClass", new Class[] { String.class, byte[].class, int.class, int.class });
      localMethod.setAccessible(true);
    } catch (NoSuchMethodException localNoSuchMethodException) {
      localMethod = null;
    }
    defineClassMethod = localMethod;
  }
}