[jdom-interest] JAXP performance problems

[Tatu Saloranta]

--- Jimmy Zhang <crackeur at comcast.net> wrote:

> Why would factory instantiation be so expensive???
> It doesn't make sense...

It actually isn't, it's the discovery process for
finding  the factory class to instantiate that is
rather expensive. And that is expensive since it
essentially may have to go through every single
JAR/directory in the effective class path of the
container.
And unfortunately the problem lies within abstract
JAXP factory base classes, not in the actual factory
implementations.

Factory instantiation is done using simple reflection
call, which while slightly less efficient than a
straight constructor call, is insignificant compared
to the discovery process.

-+ Tatu +-


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