使用jackson mixin

Question

将对象序列化为JSON时，我需要忽略空值。自从我 无法访问对象源，我使用Mixin类 我的ObjectMapper课程中的Jackson2ObjectMapperBuilder和SpringBootApplicaiton：

public void onApplicationEvent(ObjectMapperConfigured event) {
    ObjectMapper om = event.getObjectMapper();
    om.setSerializationInclusion(Include.NON_NULL);
    ....................................................
    om.addMixInAnnotations(target_class_I_dont_have_access_to.class, my_mixin_class.class);
    .........................................


public Jackson2ObjectMapperBuilder objectMapperBuilder() {
   Jackson2ObjectMapperBuilder omb = new Jackson2ObjectMapperBuilder();
   omb.serializationInclusion(Include.NON_NULL);
   ...................................................
   omb.mixIn(target_class_I_dont_have_access_to.class, my_mixin_class.class);
   .......................................................................

这对JSON输出没有影响。

我也尝试用@JsonInclude(Include.NON_NULL)注释Mixin类，但这也不起作用。

有没有办法让这个工作？任何帮助表示赞赏！

罗马