为了实现附件处理程序，您需要为多个附件定义容器类。
In order to implement an attachments handler you need to define a container class for multiple attachments. All of the attachments are based on two main things.
Apache Geronimo设计中主要的容器类是GBean。
The primary container class in the Apache Geronimo design is the GBean.
可以考虑使用一个线程安全容器类—一个保证用户操作线程安全的数据结构。
Consider a thread-safe container class - a data structure that guarantees thread safety to its clients.
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