Cks:
You are quite right; I was being sloppy, thanks for the explanation. While on the
subject, would you answer this question (which bugs me every now and then but i just
try to ignore it!!): when does a container unload and relaod a servlet (other than say
when the servlet engine is restarted)?
Geeta
"Christopher K. St. John" wrote:
> Geeta Ramani wrote:
> >
> > Just want to mention that anything that my understanding is that code in the
> > init() method is executed *exactly once* when the servlet class is first loaded.
> > This may answer your question.
> >
>
> You've got to be careful in making statements about the
> init() method, there are lots of caveats (that's latin,
> is latin allowed? :-)
>
> Normally you don't have to think about any of this, it
> just sort of works out (which is a tribute to the spec
> writers). However, when something goes wrong, it can get
> messy fast...
>
> First off (and I suspect this is what you meant) init()
> is called when a servlet instance is instantiated, not
> when its class is loaded.
>
> There are a couple of ways that the init() methods of
> different servlets of the same class could get called at
> the same time. From the 2.3 spec (but applies generally):
>
> It is important to note that there can be more than one
> instance of a given Servlet class in the servlet
> container. For example, this can occur where there was more
> than one servlet definition that utilized a specific servlet
> class with different initialization parameters. This can also
> occur when a servlet implements the SingleThreadModel
> interface and the container creates a pool of servlet
> instances to use.
>
> Also, the container can unload, then reload the servlet, so
> init() might get called many times over the life of the
> container.
>
> Even worse, there can be multiple copies of not just
> instances of a servlet class, but multiple copies of the
> servlet class itself (and thus multiple copies of its class
> static members)
>
> It's best to make as few assumptions as possible...
>
> -cks
>
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