有以下类:GWT-RPC错误 - 亚型不实例化
@Entity
public class MPolicy extends MAbstractEntity {
private MPolicyCondition condition;
private List<MPolicyAction> actions;
...
}
@Entity
public abstract class MPolicyCondition extends MAbstractEntity {
}
@Entity
public abstract class MPolicyAction extends MAbstractEntity {
@Column(unique = true)
protected String name;
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
}
为什么错误:
subtype com.*.MPolicyCondition is not instantiable
出现?
如果我从MPolicyCondition中删除抽象关键字一切正常!但MPolicyAction类也是抽象的。为什么MPolicyCondition会影响bug,但MPolicyAction是否定的?