hi alain,
> one of my concerns is: if i instanciate a class
> in doGet, it is loaded in a thread each time the
> servlet executes, so it should automatically
> unload when the thread terminates, am i right?
what do you want to say by "loaded"? If you are talking about loading of
the class by the class-loader then it is loaded only once (until some change
in class/jar file and reloading takes place) by the class-loader. If you
wanted to talk about instance creation, then yes the object is created each
time and is eligible for garbage collection after the thread dies (if you
don't keep its reference somewhere in session or context).
> but i saw some code like that inside doGet or doPost
>
> if there is an instance of my class
> use it
> else
> create it
>
> is it necessary ?
here possibly the object is stored somewhere in session or context or
some other persistent reference, and then they check whether it was already
present. Here again the multi-threaded access will take place depending on
the place where the object was stored.
> the instance of the class
> if that class is instanciated inside doGet
> should not exist anymore once doGet terminates
>
yes you are right..
> i am confused because there are many ways
> to do almost the same thing, well better have
> too many ways than none...
:-)
hope this helps,
-sourabh
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