September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Stack Traces
When an exception is caught, we can find the latest stack trace
by calling erlang:get_stacktrace(). Here’s an
example:
| try_test.erl | |
| | demo3() -> |
| | try generate_exception(5) |
| | catch |
| | error:X -> |
| | {X, erlang:get_stacktrace()} |
| | end. |
| | 1> try_test:demo3(). |
| | {a,[{try_test,generate_exception,1,[{file,"try_test.erl"},{line,9}]}, |
| | {try_test,demo3,0,[{file,"try_test.erl"},{line,33}]}, |
| | {erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,576}]}, |
| | {shell,exprs,7,[{file,"shell.erl"},{line,668}]}, |
| | {shell,eval_exprs,7,[{file,"shell.erl"},{line,623}]}, |
| | {shell,eval_loop,3,[{file,"shell.erl"},{line,608}]}]} |
The previous trace shows what happened when we tried to evaluate
try_test:demo3(). It shows that our program crashed in the function ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.