Hi,
When I use Eclipse and comment out the try/catch clause around around
the return (Atom)super.clone(), I only get the message the the
CloneNotSupportedException is not caught. I can not get the javadoc
for the particular javax.vecmath.Point3f class, so it is hard to tell
which exceptions could be thrown. When checking the online java3d
Point3f documentation I see it descends from the Tuple3f and that
class's clone method only throws a java.lang.OutOfMemoryError (and
doesn't mention the clone not supported one).
It seems to me that the safest thing to do is to not catch the
exception if there is not something useful you can do with it. This
means that a lot of methods need to have the 'throws ....' added to
them, but it should make the interface clearer and allow the 'highest
level' caller, usually the reader (or some symmetry calculation which
can produce more atoms in an atomset), to be able to figure out that
something was wrong when the file was read.
As Miguel points out it can be very dangerous to return a null when
there really was an 'exceptional' condition in the execution of the
code, unless you rethrow the exception (but in that case I don't
think the return value even comes back to the callee....).
Just my rusty thoughts this subject....
Cheers,
René
On Feb 10, 2007, at 7:02 AM, Bob Hanson wrote:
Thanks, Miguel. Yes, that's very helpful. The context is the copying
of a coordinate data set for vibrations and such.
Can someone remind me when it is that this error became a problem?
Is it
(a) that certain implementations of Java don't clone our atoms, and
so were properly throwing this clone exception, or
(b) that we were looking for the wrong exception in those cases, and
although
the exception was never actually thrown, the presence of the try/catch
was not compiling on those machines?
Bob
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