docs: protected JavaType getInnerType(String innerType) {
          try {
              Class<?> innerClass = ReflectionUtils.loadClassByName(innerType);
              if (innerClass != null) {
                  TypeFactory tf = _mapper.getTypeFactory();
                  return tf.constructType(innerClass);
              }
          } catch (ClassNotFoundException e) {
              e.printStackTrace();
          }
          return null;
      }