问题：
JPA Entity 如下
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@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 {....} |
报错：
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Resolved [java.lang.IllegalArgumentException: Id must be assignable to Serializable: null] |
解决：
Entity 中不要覆盖了super class 中的 id class
参考：