Thanks very much for your reply! This is to say, those exceptions are expected to be treated like Java's compilation errors.
On 3月15日, 下午1时50分, ataggart <alex.tagg...@gmail.com> wrote: > Exceptions are over/mis-used in java, particularly checked exceptions > (runtime exceptions aren't so bad). My sense is that those places > where java.lang.Exception is thrown, the exception is not expected to > be handled by user code, or perhaps more accurately, a direct result > of a bug fat-fingered into the user code, e.g.: > user=> (+ 5 foo) > java.lang.Exception: Unable to resolve symbol: foo in this context > (NO_SOURCE_FILE:1) > > While there's little to no value in "handling" such a case at runtime, > there is value in the exception message that can be used to debug the > problem in the code. > > Note also that the behavior is different when user code does the > resolution on a : > user=> (resolve (symbol "foo")) > nil > > There are only a handful of functions that are documented to throw an > exception, and none of them are checked exceptions. > > On Mar 13, 9:40 am, CloudiDust <cloudid...@gmail.com> wrote: > > > > > Greetings everyone! > > > I am currently beginning to learn clojure, and here's one thing that I > > don't quite understand, that many exceptions thrown by clojure are the > > most generic java.lang.Exception's (e.g. when a symbol cannot be > > resolved). Why aren't more specific exception classes used, like > > clojure.lang.SymbolResolutionException? (Having a more specific > > exception class seems useful when doing exception handling.) > > > As far as I know, clojure throws exceptions defined in the standard > > Java library only, like the IllegalStateException when updating refs > > outside a transaction. So there are no appropriate exception classes > > for some errors occurred in clojure, which may be the reason it falls > > back to java.lang.Exception. > > > Is the standard-exception-only thing intentional? If so, would you > > please tell me the rationale behind such a decision? > > > I have only played with clojure for one day, so there's a huge > > possibility that I missed or misunderstood something. > > > Please enlighten me. Thanks in advance. :) > > > Regards, > > Ruochen- 隐藏被引用文字 - > > - 显示引用的文字 - -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
