几个选项；首先，您要启用ACCEPT_EMPTY_STRING_AS_NULL_OBJECT":

Couple of options; first, you want to enable `ACCEPT_EMPTY_STRING_AS_NULL_OBJECT':

mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);

使空字符串变为空.如果您希望将其转换为实际的空列表，请覆盖 setter:

so that empty String becomes null. And if you want it to get converted to actual empty List, override setter:

public void setChildren(List<Child> c) {
    if (c == null) {
       children = Collections.emptyList();
    } else {
       chidlren = c;
    }
}