Each access intent policy defined is an aggregate of a set of properties used to control different aspects of the persistence and concurrency handling involved in dealing with EJB entities.
每个已定义的访问意图策略都是一组属性的集合，用来控制e JB实体的持久性和并发性处理的不同方面。
However, the sections on exception handling and concurrency mechanisms are still valid as advanced topics.
然而，关于异常处理和并发机制的章节，作为高级主题仍然是有效的。
To maintain this type of persistence, application components must be capable of handling concurrency, connection management, data integrity, and synchronization.
为了维护这种持久性，应用程序组件必须能够处理并发性、连接管理、数据完整性和同步。
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