您可以定义将DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES设置为true的自定义ObjectMapper Bean

import com.fasterxml.jackson.databind.DeserializationFeature
import com.fasterxml.jackson.databind.ObjectMapper

import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.context.annotation.Primary

@Configuration
class JacksonConfig

    @Bean
    @Primary
    fun objectMapper(): ObjectMapper {
        return ObjectMapper()
            .configure(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES, true)
    }
}

如果isUserAgent缺失、为null或为空，则类似下面的Request类将无法进行反序列化

data class Request(
    @JsonProperty(value = "isUserAgent", required = true)
    val userAgentSpecified: Boolean,
)

验证反序列化的测试可在github上找到