This causes the MDB to use two threads from the message listener service thread pool to process the messages.
这将导致MDB使用消息侦听器服务线程池中的两个线程来处理消息。
If a service thread does not handle an exception due to programming error, it will kill the whole application.
如果服务线程因编程错误而没有处理某个异常，则会造成整个应用程序崩溃。
If we have enough threads in the message listener service thread pool, then we will see four threads processing messages in parallel.
如果在消息侦听器服务线程池中有足够的线程，则将看到四个线程并行处理消息。
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