删除实例传递给merge，org.hibernate.ObjectDeletedException，@ ManyToOne根本原因，为什么？

Question

以下函数似乎是org.hibernate.ObjectDeletedException的根本原因：当我请求删除选项时，传递给merge的已删除实例：[com.zetorv.product.pid.model.ServerResponseOption＃]; < / p>

@ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
@JoinColumn(name = "command", nullable=false)
public BasicMenuCommand getCommand() {
    return this.command;
}

但是，当我将@ManyToOne行更改为仅@ManyToOne删除(cascade = {CascadeType.PERSIST, CascadeType.MERGE})部分时，它可以正常工作;

@ManyToOne
@JoinColumn(name = "command", nullable=false)
public BasicMenuCommand getCommand() {
    return this.command;
}

执行保存/更新的代码实际上是：return this.entityManager.merge(object);

一般而言，从@ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})更改为@ManyToOne会产生什么影响？