mybatis null check

I usually found the Null key value reject in the map using return type map
I searched for the mybatis setting to involve Null key value .


callSettersOnNulls

Specifies if setters or map's put method will be called when a retrieved value is null. It is useful when you rely on Map.keySet() or null value initialization. Note primitives such as (int,boolean,etc.) will not be set to null.

true | false

https://mybatis.github.io/mybatis-3/configuration.html

http://wus1590.blogspot.kr/2014/08/mybatis-resultmap-hashmap-null.html

Mybaits 3.2.2
mybatis-config 

<settings>
<setting name="callSettersOnNulls" value="true"/>
</settings>