JsonWriteNullProperties (Jackson JSON Processor)

已过时。
(since 1.6) Currently recommended annotation to use is JsonSerialize.include() (with values ALWAYS or NON_NULL)
```
@Target(value={TYPE,METHOD,FIELD})
@Retention(value=RUNTIME)
@Deprecated
public @interface JsonWriteNullProperties
```
Annotation that can be used to define whether object properties that have null values are to be written out when serializing content as JSON. This affects Bean and Map serialization.
Annotation can be used with Classes (all instances of given class) and Methods.
Default value for this property is 'true', meaning that null properties are written.

可选元素
限定符和类型	可选元素和说明
`boolean`	`value` 已过时。 Whether properties for beans of annotated type will always be written (true), or only if not null (false).

注释类型 JsonWriteNullProperties