All of the use cases follow this basic flow of EJB 2.1 session bean, calling a facade POJO, which in turn interacts with the JPA entity manager.
所有的用例都遵循这个基本的EJB 2.1会话bean流，即调用一个Facade POJO，后者又与JPA实体管理器交互。
The "sale" bean is a flow instance variable allocated when an execution of this flow starts.
sale “ bean是流转开始时分配的流转变量实例。”
The flowExecutor Spring bean is configured to use a flowRegistry bean to execute XML-based flow definitions located in the "/WEB-INF/flows/" directory.
Spring flowExecutor bean配置使用一个flowRegistry bean来执行"/WEB-INF/flows/"目录中的基于XML的流转定义。
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