Reading Json String using Gson results error "not a JSON Array"

Question

In my project i have a complex json response. I want to read it by GSon.

JSON : {'FoodMenuRS':{'Results':[{'Items':{'Item':[{'@Id':'24'},{'@Id':'24'}]}}, {'Items':{'Item':{'@Id':'24'}}}]}}

It contains a JSONArray with first "Item" and JSONObject with second one. Hence its call results in error,

failed to deserialize json object {"@Id":"24"} given the type java.util.List<com.servlet.action.ItemInfo>  and  java.lang.IllegalStateException: This is not a JSON Array.

Please help how i should handle this scenario. Thanks.

could you post some parsing code?, looks like you are trying to read jsonArray on jsonObject — Yashwanth Kumar
– Yashwanth Kumar, Commented Sep 7, 2011 at 8:32
Valid JSON uses " instead of '. That might not be your problem, but just in case. — Py.
– Py., Commented Sep 7, 2011 at 8:33
{"@Id":"24"} is indeed not a JSon array. Dare to share some Java code here, esp. the classes you want to deserialize that to? — Thomas
– Thomas, Commented Sep 7, 2011 at 8:34

Lalit Poptani · Accepted Answer · 2011-09-07 08:38:36Z

6

The string you are showing is a JSONObject not a JSONArray. So, in this case you first of all have to get the JSONObject and perform further decoding on that JSONObject.

JSONObject - {}

JSONArray - []

And indeed JSONObject or JSONArray should be encoded using Double-quotes(")

edited Sep 7, 2011 at 8:38

answered Sep 7, 2011 at 8:33

Lalit Poptani

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Gabriel Llamas · Accepted Answer · 2011-09-07 08:52:53Z

0

Your JSON is valid, but not for the doble quotes (") because JSON supports simple quotes (') and no quotes in the key name. See http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and-Deserializing-Colle

However this JSON have key names that begin with @. For JSON strings this character is valid at the beginning of the name (see right column http://www.json.org/) but for Java this names are illegal (see Naming section http://download.oracle.com/javase/tutorial/java/nutsandbolts/variables.html). Specifically, names started with @ are annotations and you can't use annotations tags to declare variables, fields, methods, etc.

answered Sep 7, 2011 at 8:52

Gabriel Llamas

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phihag · Accepted Answer · 2011-09-07 08:33:55Z

-1

This is not a valid JSON object. Strings in JSON are always encapsulated in double quotes ("). Contact the producer of that JSON and tell him to use a correct encoder.

answered Sep 7, 2011 at 8:33

phihag

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1 Comment

Gabriel Llamas Over a year ago

Theorically is not a valid JSON string but Gson supports " and ' and no quotes, like many other parsers. Also Javascript supports simple quotes and no quotes :) See sites.google.com/site/gson/…

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