On Tuesday 16 November 2004 13:15, Bernhard Messer wrote:
> >On Monday 15 November 2004 13:47, Bernhard Messer wrote:
> >>Hi,
...
> >The reason this is sometimes useful is that knowledge about nested
> > exception is very useful for debugging; especially line numbers.
> > (in my case I use it to keep Woodstox XML-parser 1.2 compatible, while
> > using LinkedHashMap, and nested exceptions, if possible)
> >
> >The solution is not a one-liner though (if someone is interested, let me
> > know and I can point you to the source code), so maybe it's easier to
> > just "dumb it down" to using String constructor. But I just thought I'll
> > mention that it can be completely resolved if it seems worthwhile. :-)
>
> you're right, i like the idea creating a nested exception. For the
> particular case, it would be enough to create a NestedRuntimeException
> which works under both JVM's.
Or, the alternate way; 1.4 has Throwable.initCause(), so that you can do:
...
} catch (IOException ie) {
Throwable t = new RuntimeException("Problems!!!");
t.initCause(ie);
throw t;
}
instead of
} catch (IOException ie) {
throw new RuntimeException("Problems", ie);
}
And because of this, you can create a simple utility method that
(a) Takes two Throwables as arguments (new exception to throw,
the nested exception)
(b) Uses reflection to find method Throwable.initCause(); catching
NoSuchMethodException for 1.3
(c) If (b) returns (non-null), call Method on the first Throwable, passing
second one as argument.
This utility method can actually be called either from code that constructs
the exception; or in case of a derived exception, from its constructor.
Above may sound more complicated than it really is.... it's less than 10 lines
of code, all in all.
Anyway, I don't have a strong preference either way, but if someone feels it
worth pursuing, feel free to implement the idea :-)
-+ Tatu +-
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