How is an EJB stateful session bean passivated to secondary storage
我已经阅读了有状态会话 bean：
“While in the ready stage, the EJB container may decide to deactivate,
or passivate, the bean by moving it from memory to secondary storage”
那么这个二级存储是什么？是下划线数据库吗？另外，如何在 Oracle 等关系数据库中保存(持久化)对象？
Java EE 只是一个规范，它取决于 JEE 兼容的应用服务器(例如 Glassfish、Wildfly 或 WebLogic)来确定辅助存储的确切内容。
WebLogic，至少在默认情况下，将 EJB:s 钝化到磁盘，如下图所述：
来源：https://www.codenong.com/30602694/
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