Jackson JSON library: how to instantiate a class that contains abstract fields

There are multiple ways; before version 1.8, simplest way is probably to do:

@JsonDeserialize(as=Cat.class)
public abstract class AbstractAnimal { ... }

as to deciding based on attribute, that is best done using @JsonTypeInfo, which does automatic embeddeding (when writing) and use of type information.

There are multiple kinds of type info (class name, logical type name), as well as inclusion mechanisms (as-included-property, as-wrapper-array, as-wrapper-object). This page: https://github.com/FasterXML/jackson-docs/wiki/JacksonPolymorphicDeserialization explains some of the concepts.

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