Problem:
I'm using spring mvc.
I have a requirement to output object values. All null values should be
included, but nested object should be replaced by nulls if it's empty
(consists from only null fields).
For instance, this is the wrong answer:
{ "name" : null, "age" : null, "objectGroup1" : { "id" : null, "name" :
null }, "objectGroup2" : null }
The correct answer, that I must respond with:
{ "name" : null, "age" : null, "objectGroup1" : null, "objectGroup2" : null
}
objectGroup1 was set to null but it is not filtered out!
I tried to create a Value Filter but I realized that I can't mark certain
objects as null if it is empty, there is just no way to keep the key not
filtered out, separated to its value.
I also tried to write recursive ResponseBodyAdvice in spring, and it
worked, it recursively set null for empty objects, but it looks a bit ugly.
I want somehow to be able to override object serialization of any kind of
class (for any DTO class) to be able to set nested objects as null if its
"empty" inside without having to write some recursive code on top of the
whole jackson serialization process.
How can I do this in a most efficient way?
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