code: public static Class<?> getClass(String className, Class<?> callingClass) throws ClassNotFoundException {
          ClassLoader classLoader = currentThread().getContextClassLoader();
          return Class.forName(className, true, classLoader == null ? callingClass.getClassLoader() : classLoader);
      }
docs: Returns Class.forName for {@code className} using the current thread's class loader.
  If the current thread does not have a class loader, falls back to the class loader for the
  passed-in class.
  
  @param className Name of the class.
  @param callingClass Class that is requesting a the class
  @throws ClassNotFoundException
  @since 4.13