How do I deserialize this XML array?

[ndo...@mindbridge.ai]

Hi,

How would I go about deserializing this array of mixed elements?

<result>
<animals>
<cat><name>foo</name></cat>
<dog><name>pop</name></dog>
<cat><name>fluff</name></cat>
<giraffe><name>dodo</name></giraffe>
</animals>
</result>

I haven't discovered a way yet :(

[Tatu Saloranta]

Please note that Jackson does not guarantee that it can support all kinds of XML.

It does aim to be able to deserialize content it serializes: so if you can find a way to serialize content in certain XML structure, it should be readable. But there are other structures that are not.

In this case we would have POJO with `animals` property which is a collection type, and would have to be "unwrapped" (configure to use unwrapped list, or annotate).

Elements are polymorphic, so need `@JsonTypeInfo`, and type id inclusion looks like `As.WRAPPER_OBJECT`.

I am not sure if that would exactly as presented, but it'd be something like:

public class Result {

  @JacksonXmlElementWrapper(useWrapping=false)

  public List<Animal> animals;

}

@JsonTypeInfo(use=Id.NAME, include=As.WRAPPER_OBJECT)

public abstract class Animal {

}

@JsonTypeName("cat")

public class Cat extends Animal {

  public String name;

}

-+ Tatu +-

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[ndo...@mindbridge.ai]

Hi Tatu,

Thanks for responding. I think I have a similar setup here: https://groups.google.com/forum/#!topic/jackson-user/QN3bVAgFluU. But you'll notice that the object gets wrapped twice in serialization and expects the same for deserialization. Instead of getting <result><lion></lion></result>, I get <result><result><lion></lion></result</result>. This is with latest stable release (2.8.6).

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[ndo...@mindbridge.ai]

hi Tatu,

I just tried your recommendation and it gave me similar results as before:

<Zoo>
  <name>Samba Wild Park</name>
  <city>Paz</city>
  <animals>
    <lion>
      <name>Simba</name>
      <sound>Roar</sound>
      <type>carnivorous</type>
      <endangered>true</endangered>
    </lion>
  </animals>
  <animals>
    <elephant>
      <name>Manny</name>
      <sound>trumpet</sound>
      <type>herbivorous</type>
      <endangered>false</endangered>
    </elephant>
  </animals>
</Zoo>

Notice the <animals> tag doesnt wrap around both elements but around each, instead.

[Tatu Saloranta]

I think this is then a structure that is not supported by Jackson at this point.

I don't know if it would be possible to try combine elements; the
problem is that polymorphic type being written results in one element,
and then POJO itself results in the other.

-+ Tatu +-