您可以“强制解决”此强制派生类以实现方法，该方法将确保分配ID并使用@PrePersist对该方法进行注释。您可以为将为其自动生成ID的类提供默认实现。
Somethig喜欢：
@MappedSuperclass
public abstract class BaseEntity<T> implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
protected T id;
@PrePersist
public void ensureIdAssigned() {
ensureIdAssignedInternal();
}
public abstract void ensureIdAssignedInternal();
}
@MappedSuperclass
public abstract class AutoIdMaintaintedEntity<T> extends MaintainedEntity<T> { // provide default implementation for Entities with Id generated by @GeneratedValue(strategy=GenerationType.IDENTITY) on BaseEntity superclass
public void ensureIdAssignedInternal() {
// nothing here since the Id will be automatically assigned
}
}
@Entity
public class Table1 extends AutoIdMaintaintedEntity<Long> {
@Column
private String value;
}
@Entity
public class Table2 extends BaseEntity<String> {
@Column
private String shortDescription;
@Column
private String longDescription;
public void ensureIdAssignedInternal() {
this.id = generateMyTextId();
}
private String generateMyTextId() {
return "text id";
}
}
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