trying out the prototype

[Gernot Neppert]

2010/8/24 Joe Darcy <joe.darcy at oracle.com>:
>
> With N resources, there are possibly N+1 exceptions that can come out of the
> try-with-resources statement, 1 from the block itself and 1 from each of the
> close calls.  Only one of those exceptions can be the one which gets
> propagated out of the block.
>
> As covered in the other recent thread, the first exception thrown is
> estimated to be the most informative one about what actually went wrong.
>
> -Joe
>


What I do understand is that the exception thrown from the block is
considered more important than the exception thrown by the same
resource afterwards, when it is being closed.

I just doubt that you can make a similarily educated guess about the
relative importance of exceptions thrown by unrelated resources.
Here is a simple example:

try(Writer out = new FileWriter("output.txt"; Reader in = new
FileReader("input.txt"))
{
// Code to copy from in to out.
}

Now, if the constructor of 'in' throws a (relatively harmless)
FileNotFoundException, the much more serious DiskFullException thrown
by the close() method of 'out' will be lost.