Jackson: JsonInclude how to add Multiple JsonInclude annotation type

问题

How can I tell a class to include only NON_EMPTY and NON_NULL values only, Using

@JsonInclude(Include.NON_NULL)
@JsonInclude(Include.NON_EMPTY)
public class foo{
    String a;
}

is throwing error of duplicate annotation.

回答1:

"Null is always considered empty" - Jackson's site

So the NON_EMPTY rule covers both cases..

来源：https://stackoverflow.com/questions/23631511/jackson-jsoninclude-how-to-add-multiple-jsoninclude-annotation-type