Hello!
We are working on client libraries for a service. One of the service APIs
can return an xml list with heterogeneous types ordered by name. There are
two possible types in this list. A sample response might be:
<Items>
<TypeA>
<Name1>
</TypeA>
<TypeB>
<Name2>
</TypeB>
<TypeA>
<Name3>
</TypeA>
<TypeA>
<Name4>
</TypeA>
<TypeB>
<Name5>
</TypeB>
<TypeB>
<Name6>
</TypeB>
<TypeA>
<Name7>
</TypeA>
<TypeB>
<Name8>
</TypeB>
<TypeB>
<Name9>
</TypeB>
</Item>
The goal is to deserialize this list into two separate lists that each hold
all of one of the types. So with the given example, we would hope to see
(with the Name here being shorthand for a fully deserialized object):
listOfTypeA={Name1, Name3, Name4, Name7} and listOfTypeB = {Name2, Name5,
Name6, Name8, Name9}. Instead, we are seeing listOfTypeA = {Name7} and
listOfTypeB={Name8, Name9}. In other words, only the last contiguous set of
names is persisted and returned.
I have stepped through the code and confirmed that this is because each
time an element of a certain type is encountered, a new list is created and
eventually overwrites any other list that was previously on the root object
rather than appending to an existing list. More specifically, each time
CollectionDeserializer.deserialize is called, a new list is instantiated.
Our object model is the parent type of name Item, which has an
ArrayList<TypeA> and ArrayList<TypeB>. Each is annoted with @JsonProperty()
and the respective type name. We are using Jackson version 2.8.11.
Is there a way we can configure Jackson to yield the behavior we want? Or
some sort of workaround you can suggest? Or should I make a feature
request/issue on the repo?
Thank you for your help!
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