(The lack of a) JSON parser for J2ME : epepep

(The lack of a) JSON parser for J2ME

by Per Liedman

In a pet project I’m spending my nights working on (hopefully more about that in a later post), I found myself in need of a JSON parser, or deserializer, for J2ME/CLDC. A bit to my surprise, I found that such a thing was not easy to find, even with the whole of the internets at my disposal.

To summarize, it appears that there has been a JSON lib for J2ME up on json.org at some point, but at least I can’t find it any longer. Also, some project on java.net is popular to link to, but come on, no download link? No pre-compiled JAR-file?

Anyway, after asking over at stackoverflow.com and getting surprisingly few answers, at least I found a link to some code that was easy enough to grab.

As some kind of attempt to give back to the community, I upload the compiled JAR from that source code here. So if you need to serialize, deserialize, marshal or unmarshal JSON from J2ME/CLDC, grab this JAR and go ahead:

Compiled JAR: json-me.jar
~~Source code: json-me.tar.gz~~ Updated 2010-09-25: the source is now available on BitBucket

The code is most likely a copy of the one that was previously posted on json.org, and is distributed under the json.org license according to the copyright notice in the source (most importantly: “The Software shall be used for Good, not Evil.”)

As a very tiny modification, I have added the methods remove and removeAll to the class JSONArray, since I really needed them. I hope you don’t mind too much.

Published: June 7, 2010

Filed Under: Show me teh codes

7 Responses to “(The lack of a) JSON parser for J2ME”

tedi says:

2010-07-26 at 05:41

thanks buddy..
Stefan says:

2010-08-10 at 10:13

Thank you too.
I got errors in your precompiled jars.

I found the error at your additional method. I had to change the source-code at public method remove in JSONArray.
“myArrayList.removeElementAt(index);”

Reason maybe special j2me-jars for Sun SPOT Devices.
A bit of JSON in my bucket : epepep says:

2010-09-25 at 10:49

[...] of code on my blog is far from ideal from pretty much any perspective, I took the time and put the JSON-ME source code up on BitBucket, with all its Mercurial goodness. [...]
vidhyadharan says:

2011-05-13 at 22:57

hi dude,

thanks its really useful for me..

Thanks,
vidhya
ofir says:

2011-06-01 at 15:32

Hey,

I have a few questions:

1) When developing a J2ME application, the JRE version must be 1.4 or lower, right?
2) Assuming the answer to the previous question is: “true”, how can I use this JSON library? it uses ArrayList and some other stuff that I think I don’t have in the 1.4 version… what am I getting wrong??

Thanks in advance.
Developer says:

2011-07-29 at 08:42

Thanks for the complied jar !
Celestine says:

2011-08-22 at 16:16

Thanks.

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