import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.IdClass; import lombok.Getter; import lombok.Setter; @Entity @Getter @Setter @IdClass(UserGroupPK.class) public class UserGroup { @Id private String groupId; @Id private String userId; } import java.io.Serializable; import lombok.Data; @Data public class UserGroupPK implements Serializable { private String gro..
