依据前面制定的规范，我们新建DeleteAction # DeleteAction ``` package com.mengyunzhi.javaee.action.klass; import com.mengyunzhi.javaee.action.Action; import com.opensymphony.xwork2.validator.annotations.RequiredFieldValidator; public class DeleteAction extends Action{ private static final long serialVersionUID = 1L; private Long id; public Long getId() { return id; } @RequiredFieldValidator(message = "必须传入ID") public void setId(Long id) { if (id == 100L) { this.addActionError("尚有学生位于该班级中，删除失败"); } this.id = id; } public String execute() { return SUCCESS; } } ``` # 测试    <hr /> > git checkout -f step12.6.2