Hibernate : Exception java.lang.ClassCastException: org.hibernate.mapping.JoinedSubclass cannot be cast to org.hibernate.mapping.RootClass

you can’t have @Id in both super class and Subclass

Solution

Remove @Id from Subclass

————————–

If tables are joined by different names use @PrimaryKeyJoinColumn(name = “IDColumn”)

————————–

@Entity
@Table(name = "STUDENT")
@Inheritance(strategy = InheritanceType.JOINED)
public class Student {
...
}
@Entity
@PrimaryKeyJoinColumn(name="ID")
public class Undergraduate extends Student {
	private int id;
...
}
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