报错：Java 8 date/time type java.time.LocalDateTime not supported by default: add Module “com.fasterxml.jackson.datatype:jackson-datatype-jsr310” to enable handling (through reference chain: com.xxxx[“createTime”])
报错提示了，jackson 不支持 java8的 LocalDateTime 类型，需要引入依赖添加模块jackson-datatype-jsr310
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 <dependency>
     <groupId>com.fasterxml.jackson.datatype</groupId>
     <artifactId>jackson-datatype-jsr310</artifactId>
     <version>2.13.0</version>
 </dependency>

objectMapper.registerModule(new JavaTimeModule());