在创建PC时，它与当前有效的事务相连，并连同事务上下文一起由容器传播到相同JVM中的其他被调用组件。
At the time the PC is created, it is linked with the transaction currently in effect and propagated by the container, along with the transaction context to other called components within the same JVM.
此功能包还包括对Blueprint的扩展，所以容器可以将持久化单元和上下文注入到Blueprint bean中。
The feature pack also includes extensions to Blueprint so that the container can inject persistence units and contexts into Blueprint beans.
在Web和ejb容器中不允许它的原因是因为上下文。
The reason that this is not permitted in the Web and EJB container is because of context.
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