* @param <T> the type of the object associated to this key
     */
    final class Key<T> {

        private final Class<T> type;
        private final Object id;

        private Key(Class<T> type, Object id) {
            this.type = type;
            this.id = id;
        }

        public Class<T> type() {
            return type;
        }

        @Override

        final Class<?> rowClass = getActualClass(type, map);
        if (rowClass == null) {
            return null;
        }
        final ParameterizedClassDescImpl desc = new ParameterizedClassDescImpl(rowClass);
        final Type[] parameterTypes = getGenericParameters(type);
        if (parameterTypes == null) {

      },
      "hitCount": {
        "type": "long"
      },
      "hitCountRelation": {
        "type": "keyword"
      },
      "queryOffset": {
        "type": "integer"
      },
      "queryPageSize": {
        "type": "integer"
      },
      "userAgent": {
        "type": "keyword"
      },
      "referer": {
        "type": "keyword"
      },
      "clientIp": {
        "type": "keyword"

          <version>1.0.0+</version>
          <type>String</type>
          <description>The version of the dependency.</description>
        </field>
        <field>
          <name>type</name>
          <version>1.0.0+</version>
          <type>String</type>
          <defaultValue>jar</defaultValue>
          <description>The type of dependency.</description>
        </field>
      </fields>

			Type:        "url",
			Sensitive:   true,
		},
		config.HelpKV{
			Key:         target.AmqpExchange,
			Description: "name of the AMQP exchange",
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         target.AmqpExchangeType,
			Description: "AMQP exchange type",
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{

                            "type": "array",
                            "items": {
                                "anyOf": [{"type": "string"}, {"type": "integer"}]
                            },
                        },
                        "msg": {"title": "Message", "type": "string"},
                        "type": {"title": "Error Type", "type": "string"},
                    },
                },

{
    "properties": {
      "sessionId": {
        "type": "keyword"
      },
      "name": {
        "type": "keyword"
      },
      "expiredTime": {
        "type": "long"
      },
      "createdTime": {
        "type": "long"
      }
    }

{
    "properties": {
      "crawlingInfoId": {
        "type": "keyword"
      },
      "key": {
        "type": "keyword"
      },
      "value": {
        "type": "keyword"
      },
      "createdTime": {
        "type": "long"
      }
    }

Todo **FastAPI** está basado en estos type hints, lo que le da muchas ventajas y beneficios.

Pero, así nunca uses **FastAPI** te beneficiarás de aprender un poco sobre los type hints.

/// note | Nota

Si eres un experto en Python y ya lo sabes todo sobre los type hints, salta al siguiente capítulo.

    private static final long serialVersionUID = 1L;

    private final String type;

    public InvalidAccessTokenException(final String type, final String message) {
        super(message);
        this.type = type;
    }

    public String getType() {
        return type;
    }