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 package com.fasterxml.jackson.databind;
Abstract class that defines API used for deserializing JSON content field names into Java Map keys. These deserializers are only used if the Map key class is not String or Object.
public abstract class KeyDeserializer
Method called to deserialize a java.util.Map key from JSON property name.
    public abstract Object deserializeKey(String keyDeserializationContext ctxt)
        throws IOExceptionJsonProcessingException;

This marker class is only to be used with annotations, to indicate that no deserializer is configured.

Specifically, this class is to be used as the marker for annotation com.fasterxml.jackson.databind.annotation.JsonDeserialize.

    public abstract static class None
        extends KeyDeserializer { }
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