On Oct 3, 12:27 pm, Stuart Halloway <stuart.hallo...@gmail.com> wrote:
> 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?

Your example works because it doesn't trigger the use of
clojure.lang.Reflector. I'm having a hard time isolating a good
example where an exception passes through Reflector on its way from
Java into Clojure. (It doesn't happen when trivially calling simple
methods on simple Java classes.)

Here is the relevant stack trace, however. The top level invocation of
DatastoreServiceImpl.get throws the exception (level 0), and I hope to
catch it in retrieve (level 9).

  0:
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:
64)
  1: sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  2:
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
  3:
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
  4: java.lang.reflect.Method.invoke(Method.java:597)
  5: clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:92)
  6: clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:30)
  7: appengine_magic.services.datastore
$retrieve_helper.doInvoke(datastore.clj:363)
  8: clojure.lang.RestFn.invoke(RestFn.java:521)
  9: appengine_magic.services.datastore
$retrieve.doInvoke(datastore.clj:376)

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