How I can catch exception from cheshire.core?

[Алексей Александров]

Hello.

I'm trying catch exception from cheshire.core/decode (or parse-string). But it didn't work

user=> (require ['cheshire.core :as 'json])

user=> (try (json/decode "[{\"id\":ty\":1}]") (catch Throwable _ (println "I catched exception")))

JsonParseException Unrecognized token 'ty': was expecting 

 at [Source: java.io.StringReader@1fd2f14; line: 1, column: 10]  com.fasterxml.jackson.core.JsonParser._constructError (JsonParser.java:1369)

com.fasterxml.jackson.core.JsonParser._constructError is helper method for constucting JsonParseException object

called like:

throw _constructError("Numeric value ("+getText()+") out of range of Java byte")

--

Alexey Aleksandrov

[Cedric Greevey]

Is json/decode returning a lazy seq? If so, you're constructing it inside the try and then realizing it outside the try, and the exception may be coming from the realization step.

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[Алексей Александров]

Yes, json/decode return clojure.lang.LazySeq.
I added (doall  ) to force calculation.

Thank you.

2013/9/11 Cedric Greevey <cgre...@gmail.com>

--

Alexey Aleksandrov

[Norman Richards]

On Wednesday, September 11, 2013 5:29:39 AM UTC-5, Алексей Александров wrote:

Yes, json/decode return clojure.lang.LazySeq.
I added (doall  ) to force calculation.

This bit me on a project yesterday.   I also added a doall, but I haven't had time to investigate whether any of the interior items are also lazy, in which case I guess we'd need some sort of tree walking doall?