无状态会话Bean 无状态就是对于一次操作,不能保存数据.无状态对象(Stateless Bean)是没有实例变量的对象,不能保存数据,是不变类,是线程安全的.例如: public class A { public A() {} public String hello() { return "Hello 谁?"; } } public class Client { public Client() { A a = new A(); System.out.println(a.hell
mssqlserver在查询系统视图时(如:select * from sys.syscacheobjects),有时会报出如下提示: 消息 300,级别 14,状态 1,第 1 行VIEW SERVER STATE permission was denied on object 'server', database 'master'.消息 297,级别 16,状态 1,第 1 行The user does not have permission to perform this action.