On Monday Aug 23, 1999, Imam, Asim, CFCTR wrote:
> I just need to confirm something for
> jsp/servlets...Everytime a client invokes a servlet, a new
> instance of that servlet is created . Is that true?? I
> mean if ten clients hitting the same servlet, is it the
> same servlet instance doing all the work or does it spawn
> ?? How does that work??
You (and the servlet engine) have a choice. You can affect
the behavior by having the servlet implement
javax.servlet.SingleThreadModel or not. To quote its
documentation:
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 container can make
this guarantee by synchronizing access to a single instance
of the servlet, or 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.
The specification does not demand pooling or any other
behavior reguarding this aside from what's written above.
In other words, check with the servlet engine you are using.
Howard
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