Thanks for the Inputs mate.
On Sun, Jan 10, 2021 at 6:38 AM Tatu Saloranta <t...@fasterxml.com> wrote:
> On Sat, Jan 9, 2021 at 10:09 AM Govinda Sakhare
> <govindasakhar...@gmail.com> wrote:
> >
> > Hi All,
> >
> > I have written a custom de-serializer to ensure backward compatibility
> between models and applied it on a field as below. I want the de-serializer
> to kick-in if the JsonNode is array otherwise I want the default
> deserializer to deserialize the field. I tried the below approach using the
> ObjectMapper object but it is not working.
> >
> > class Person {
> >
> > private int id;
> >
> > @JsonDeserialize(using = CustomDeserializer.class)
> > @JsonAlias("addresses")
> > private AddressDetails addressDetails;
> > // .Getter setters
> > }
> >
> > but in else part jsonNode.asText() is returning empty string, but
> debugger is showing child nodes. am I doing something wrong here?
>
> Yes, the problem is that "Jsonnode.asText()" will just return String
> value of scalar-valued node, and that is not going to work as input
> in most cases (it might sort of work for Boolean and Number values but
> nothing else): for Objects and Arrays it simply returns "".
> In future you may want to read Javadocs of the methods you call to see
> what they are supposed to do, that helps a lot in figuring out how to
> do things.
>
> There are couple of ways to "read" from JsonNode (like it was a json
> document), however, and the simplest is:
>
> return ((ObjectMapper) parser.getCodec()).treeToValue(jsonNode,
> AddressDetails.class);
>
> (note: you usually do not want to do this
>
> ObjectMapper objectMapper = new ObjectMapper();
>
> as constructing a new mapper is very expensive and does not have
> configuration settings).
>
> Hope this helps,
>
> -+ Tatu +-
>
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> .
>
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