i use org.json library to work with JSON-data in my apps. But it seems that google app engine doesn't allow to use it, what's the best way to work with JSON on GAE-apps?
I had the similar question a week ago and after comparing a number of Java JSON libraries (including JSonLIB and GSON) I have chosen Jackson . Check other comparisons on StackOverflow, most of them would recommend Jackson out of the rest.
After two weeks using it on Google Appengine, I just love it. Not only it has more features than the other mentioned libraries, it is also much faster (see benchmarks here ). It is a Json engine in Jersey which I would recommend as well if you want to do anything Restful on Appengine.
It is stable and still actively developed, with version 2 has just been released couple of weeks ago.
UPDATE: here is a sample demo for using Jackson with GAE.
Use fast JSON is a very productive API. Jackson take too much code.
http://code.alibabatech.com/wiki/display/FastJSON/Home
https://github.com/alibaba/fastjson
Just copy the library into WEB-INF/lib folder and use the static methods of com.alibaba.fastjson.JSON
like JSON.toJSONString(object)
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