关于异常：attempt to create delete event with null entity

 public void delete(int id) {     [color=#FF0000] this.getHibernateTemplate().delete(this.getUserInfo(id)) ;[/color]     }

public void deleteUser(int id) {                [color=#FF0000]this.userDao.delete(id);[/color]            }            public UserInfo getUser(int id) {                return this.userDao.getUserInfo(id);            }

 public String delete() {                 UserManagerService b= (UserManagerService) DefaultBeanFactory.getBean("UserManagerService");               if (this.name !=" ") {              [color=#FF0000] b.deleteUser(this.id);[/color]              } else {               if (ids.length > 0) {                for (int id : ids) {                 b.deleteUser(id);                }               }              }              if (b.listUser().size() > 0) {                  return "list_delete";                //  return SUCCESS;              } else {               return INPUT;              }             }