使用
@JacksonAnnotationsInside解决问题：
public class JacksonTest { @Retention(RetentionPolicy.RUNTIME) @JacksonAnnotationsInside @JsonProperty("_id") @JsonSerialize(using=IdSerializer.class, include=Inclusion.NON_NULL) @JsonDeserialize(using=IdDeserializer.class) public @interface Id { } public static class Answer { @Id String id; String name; public Answer() {} } @Test public void testInside() throws IOException { ObjectMapper mapper = new ObjectMapper(); VisibilityChecker<?> checker = mapper.getSerializationConfig().getDefaultVisibilityChecker(); mapper.setVisibilityChecker(checker.withFieldVisibility(JsonAutoDetect.Visibility.ANY)); String string = "{ 'name' : 'John' , '_id' : { 'sub' : '47cc'}}".replace(''', '"'); Answer answer = mapper.reader(Answer.class).readValue(string); Assertions.assertThat(answer.id).isEqualTo("47cc"); }}
