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<https://github.com/clojure/data.json/blob/master/src/main/clojure/clojure/data/json.clj>
> ,
> 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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