Hello,

I hope my question will not be another "why doesn't Jackson find 
polymorphic type for my Map values (or List or Set)" and  I hope I did my 
best to check for any question/answer :).

I have a bean with an any field: 
@JsonAnyGetter
@JsonAnySetter
protected Map<String, Object> properties = new HashMap<>();

When initializing the map with:
properties.put("foo", new FooBean());
properties.put("foos", List.of(new FooBean()));
properties.put("long", 123);
properties.put("longs", List.of(123));
properties.put("longss", List.of(List.of(123)));

I want to produce:
{
"foo": {
"@class": "org.FooBean", "foo": "bar"
},
"foos": [
{
"@class": "org.FooBean", "foo": "bar"
}
],
"long": 123,
"longs": [123, 567],
"longss": [[123], 567]
}

ie. a type for bean but not for primitive or collection/map.

Is this use case achievable by using jackson? To quote that post 
<https://groups.google.com/g/jackson-user/c/aHHmeZW37Es/m/yhPhZBbmBwAJ>  *if 
there'd be an option that says, if there is a type attribute at the 
beginning, create this type, rather than a natural one. *

Thanks for your help

Nicolas



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