[jdom-interest] NoSuch*Exceptions in JDOM

[Alex Chaffee]

> Throwing and catching a new exception involves at least:
> - creating the exception
> - looking up the exception in a catch table
> This all performes badly as compared to returning a value.

As Petri recognized but didn't say explicitly, there is also the cost
of creating the message string to be stored in the exception.  This
cost is not just in time but in memory, since it usually leaves
StringBuffer droppings in the heap, meaning that GC must happen
sooner, which can be a big slowdown for a long-running app, like a
server.


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