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-66a4a58a7e19e3… 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
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