are you trying to turn something into a json string? if so, the
json-str function is probably what you are looking for:
user> (json/json-str {:a "b"})
"{\"a\":\"b\"}"
by the way, the nil in your previous email is not being suffixed to
the string, its simply the return of the function getting written to
stdout by the repl immediately after the function has printed there
also. simply pressing enter at the repl will cause 'nil' to be printed
too...
On Tue, Jun 28, 2011 at 8:46 PM, Timothy Washington <twash...@gmail.com> wrote:
> Ok, so I fixed the problem by changing A) to B)
>
> A)
>
> (defn print-json
>
> ...
>
> (write-json x *out* escape-unicode)))
>
> to
>
> B)
>
> (defn print-json
>
> ...
>
> (write-json (PrintWriter. *out*) escape-unicode)))
>
> The only thing now, is that the 'nil' return value suffixes itself. I can
> find out where that is. But I think this this could be fixed easily enough.
> If you like, I can do this locally and, I guessing, submit a github pull
> request.
>
> user => (clojure.data.json/print-json "tim")
>
> "tim"nil
>
> user=> (clojure.data.json/print-json [1 2 3])
>
> [1,2,3]nil
>
> user => (clojure.data.json/print-json { :a { :aa "b" } } )
>
> {"a":{"aa":"b"}}nil
>
> Tim
>
>
>
> On Tue, Jun 28, 2011 at 8:59 PM, Timothy Washington <twash...@gmail.com>
> wrote:
>>
>> I'm trying to do a simple print-json, and am getting a ClassCastException
>> in the data.json library. I'm using [org.clojure/clojure "1.3.0-beta1"] and
>> [org.clojure/data.json "0.1.0"]. So…
>>
>> > lein repl
>>
>> …
>>
>> user => (require 'clojure.data.json)
>>
>> nil
>>
>> user => (clojure.data.json/print-json "tim")
>>
>> ClassCastException java.io.OutputStreamWriter cannot be cast to
>> java.io.PrintWriter clojure.data.json/write-json-string (json.clj:229)
>>
>> user=> (clojure.data.json/print-json [1 2 3])
>>
>> ClassCastException java.io.OutputStreamWriter cannot be cast to
>> java.io.PrintWriter clojure.data.json/write-json-array (json.clj:254)
>>
>> user => (clojure.data.json/print-json { :a { :aa "b" } } )
>>
>> ClassCastException java.io.OutputStreamWriter cannot be cast to
>> java.io.PrintWriter clojure.data.json/write-json-object (json.clj:238)
>>
>> Seems fairly straightforward (I've also tried on lists, nested hashes,
>> etc). If I look at the source for json:229 , the 'out' variable looks to be
>> a PrintWriter (and my local source version is the same). And a stacktrace
>> gives exactly that location
>>
>> user=> (. *e printStackTrace)
>>
>> java.lang.ClassCastException: java.io.OutputStreamWriter cannot be cast to
>> java.io.PrintWriter
>>
>> at clojure.data.json$write_json_string.invoke(json.clj:229)
>>
>> at
>> clojure.data.json$eval108$fn__109$G__99__118.invoke(json.clj:201)
>>
>> at clojure.data.json$print_json.doInvoke(json.clj:331)
>>
>> at clojure.lang.RestFn.invoke(RestFn.java:410)
>>
>> at user$eval212.invoke(NO_SOURCE_FILE:24)
>>
>> at clojure.lang.Compiler.eval(Compiler.java:6406)
>>
>> at clojure.lang.Compiler.eval(Compiler.java:6372)
>>
>> at clojure.core$eval.invoke(core.clj:2745)
>>
>> at clojure.main$repl$read_eval_print__6016.invoke(main.clj:244)
>>
>> at clojure.main$repl$fn__6021.invoke(main.clj:265)
>>
>> at clojure.main$repl.doInvoke(main.clj:265)
>>
>> at clojure.lang.RestFn.invoke(RestFn.java:512)
>>
>> at user$eval7$acc__1060__auto____8$fn__10.invoke(NO_SOURCE_FILE:1)
>>
>> at clojure.lang.AFn.run(AFn.java:24)
>>
>> at java.lang.Thread.run(Thread.java:636)
>>
>> nil
>>
>> user=>
>>
>> Is there a problem in the data.json lib?
>>
>> Tim
>
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