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-674472abc9c974… 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-674472abc… Read More