I believe the actual problem comes from things like RT.classForName(),
which internally catches a ClassNotFoundException, and then does this:
throw Util.runtimeException(e);
That ends up just sort of obscuring what the exception is, and you
can't just catch ClassNotFoundException - you have to catch the
RuntimeException, and then figure out what it really means if you
actually have to respond to a specific case. I'm not a particular fan
of checked exceptions, but I don't entirely understand the rationale
behind this.
On Oct 3, 12:27 pm, Stuart Halloway <stuart.hallo...@gmail.com> wrote:
> > The Google App Engine SDK uses checked exceptions on many of its API
> > methods. In many cases, I want to catch these exceptions and do
> > something Clojure-friendly with them. With Clojure 1.2.x, I had no
> > trouble catching checked exceptions by type, e.g.:
>
> > (try
> > (some-app-engine-api-methods-called-here ...)
> > (catch EntityNotFoundException ex ...))
>
> > This stopped working in 1.3.0. The caught exception does not match
> > EntityNotFoundException; it is now a RuntimeException with the
> > original typed exception chained to it.
>
> > I don't fully understand the implications of the exception handling
> > changes in 1.3 (https://github.com/clojure/clojure/commit/
> > 8fda34e4c77cac079b711da59d5fe49b74605553). Does it mean that all
> > exceptions coming in from Java code into Clojure will now be wrapped
> > in an extra RuntimeException?
>
> Catching checked exceptions seems to work fine. Try e.g.
>
> (try (throw (java.io.IOException.)) (catch java.io.IOException _ "caught!"))
>
> I suspect something else is going wrong in the GAE example. Can you narrow
> the code down to a block you can quote in full here?
>
> Stu
>
> Stuart Halloway
> Clojure/corehttp://clojure.com
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