多个实例时Servlet同步
我读到 Servlet 中的代码可以与同步块同步。然而，我还了解到，虽然 servlet 通常只有一个实例，但 servlet 容器可能会保留一组实例。当然，这意味着同步块不能保证正常工作，因为您不知道请求线程将选择哪个实例？
I have read that code in servlets can be synchronized with synchronized blocks. However, I have also read that whilst there is often only one instance of a servlet the servlet container may keep a pool of instances. Surely this means that a synchronized block is therefore not guaranteed to work as you don't know which instance the request thread will choose?
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规范 (3.0) 的 2.2 节说：
因此，如果容器使用实例池，则违反了规范。我不明白为什么容器会这样做，因为每个 servlet 开发人员都知道多个线程可以同时访问 servlet，因此 servlet 必须是线程安全的。
Section 2.2 of the specification (3.0) says:
So, if a container uses a pool of instances, it's in violation of the spec. I don't see why a container would do that, since every servlet developers know that multiple threads may access the servlet concurrently, and the servlet must thus be thread-safe.