JPA Resolved [java.lang.IllegalArgumentException: Id must be assignable to Serializable: null] 2023年12月8日 问题： JPA Entity 如下 @Table (name= "EMP") @Inheritance @DiscriminatorColumn (name="EMP TPE") public abstract class Employee {...} @Entity @DiscriminatorValue ("CEmp") public class contractemployee extenas Employee{...} @MappedSuperclass public abstract class CompanyEmployee extends Employee {...} @Entity @DiscriminatorValue ("FTEmp") public class FullTimeEmployee extenas companyemployee {....} @Entity (name= "PTEmp") public class PartTimeEmployee extends CompanyEmployee {....} 123456789101112131415161718 @Table (name= "EMP") @Inheritance@DiscriminatorColumn (name="EMP TPE") public abstract class Employee {...} @Entity@DiscriminatorValue ("CEmp")public class contractemployee extenas Employee{...} @MappedSuperclasspublic abstract class CompanyEmployee extends Employee {...} @Entity@DiscriminatorValue ("FTEmp")public class FullTimeEmployee extenas companyemployee {....} @Entity (name= "PTEmp")public class PartTimeEmployee extends CompanyEmployee {....} &nbs… Read More
SpringBoot Caused by: com.mysql.cj.exceptions.ConnectionIsClosedException: No operations allowed after connection closed. 2023年11月18日 问题： spring boot + hikari + mysql [crayon-673ed5dcf1d498… Read More
老的苹果电脑如何安装新的 macos？老的 macbook pro 如何安装新的 macos？ 2023年9月19日 问题： 新的 macos 对于太老的机型都不支持 ，如 macos Ventura (13.x) 需要mac… Read More
ios cocoapods pod install 卡住怎么办? (2) 2023年9月4日 问题： pod install 发现某个 pod 一直安装失败 错误提示： [crayon-673ed5dcf… Read More