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Ensures that servlets handle only one request at a time. This interface has no methods.
If a servlet implements this interface, you are guaranteed
that no two threads will execute concurrently in the
servlet's service
method. The servlet engine
does this by maintaining a pool of servlet instances and
dispatching each new request to a free servlet.
If a servlet implements this interface, the servlet will be thread safe. However, this interface does not prevent synchronization problems that result from servlets accessing shared resources such as static class variables or classes outside the scope of the servlet.
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