Getting Clojure Stacktrace

Question

I am aware of http://richhickey.github.com/clojure/clojure.stacktrace-api.html .

Is there a way to get the current stacktrace w/o throwing an exception and catching it?

(I'm debugging a piece of code, and want to capture stacktraces at certain points so I can analyze what's going on.)

Thanks!

So basically: either create your own exception, or call a function which creates its own exception? I didn't realize exceptions were such low level / inexpensive primitives. I thought surely there must be some overheat that can be eliminated if I just want the stacktrace. — user1383359
– user1383359, Commented May 10, 2012 at 19:00

number23_cn · Accepted Answer · 2012-05-10 07:29:00Z

8

use clojure.repl.pst

user=> (try (/ 1 0) (catch Exception e (pst e)))
ArithmeticException Divide by zero
    clojure.lang.Numbers.divide (Numbers.java:156)
    clojure.lang.Numbers.divide (Numbers.java:3691)
    user/eval28 (NO_SOURCE_FILE:8)
    clojure.lang.Compiler.eval (Compiler.java:6511)
    clojure.lang.Compiler.eval (Compiler.java:6477)
    clojure.core/eval (core.clj:2797)
    clojure.main/repl/read-eval-print--6569 (main.clj:245)
    clojure.main/repl/fn--6574 (main.clj:266)
    clojure.main/repl (main.clj:266)
    clojure.main/repl-opt (main.clj:332)
    clojure.main/main (main.clj:427)
    clojure.lang.Var.invoke (Var.java:423)

answered May 10, 2012 at 7:29

number23_cn

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number23_cn Over a year ago

BTW: pst print stack trace to *err*

Community · Accepted Answer · 2017-05-23 12:31:48Z

2

This code return StackTraceElement array which is not so hard to turn in readable form:

(.getStackTrace (Thread/currentThread))

edited May 23, 2017 at 12:31

CommunityBot

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answered Apr 9, 2013 at 12:56

om-nom-nom

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1 Comment

Petri Ryhänen Oct 15 at 9:01

This seems to be the way if you want print the trace outside repl. Printing needed bit work. (doseq [element (.getStackTrace (Thread/currentThread))](clojure.stacktrace/print-trace-element element) (println))

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