错误信息如下
*************************** APPLICATION FAILED TO START *************************** Description: Parameter 0 of constructor in com.jon.demo.utils.GenerateMaxId required a bean of type 'java.lang.Long' that could not be found. The injection point has the following annotations: - @org.springframework.beans.factory.annotation.Autowired(required=true) Action: Consider defining a bean of type 'java.lang.Long' in your configuration.
原因：
1、工具类中缺少了@Component
2、工具类中自定义了有参构造，但是没有显式声明无参构造器
