protected static Class<?> getClass(String className) {
    try {
      return Thread.currentThread().getContextClassLoader().loadClass(className);
//      return ReflectUtil.findClass(className);
    } catch (ClassNotFoundException e) {
      log.debug("Class not found: " + className);
      return null;
    }
  }
Get a class by name. If the class is not found then return null.
src/main/java/org/apache/ibatis/io/VFS.java