SerializationFeature.FAIL_ON_EMPTY_BEANS 应用及简介

业务数据body是Object类型，其实有时候就是个空对象，所以是无法序列化，jackson 默认是对所有数据类型进行序列化。所以就只能自定义ObjectMapper，配置mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)

spring.datasource.url' is not specified and no embedded datasource could be auto-configured

auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-configured.