SerializedName does not work with enum types in EnumMap

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Defining an enum type such as:
public enum Test {
    @SerializedName("aaa")
    A,
    @SerializedName("bbb")
    B,
    @SerializedName("ccc")
    C
}

2. Testing the enum type with a EnumMap class, such as:

Gson gson = new Gson();
System.out.println(gson.toJson(Test.A));
System.out.println(gson.toJson(Test.B));
System.out.println(gson.toJson(Test.C));

Map<Test, Integer> testMap = new EnumMap<Test, Integer>(Test.class);
testMap.put(Test.A, 3);
testMap.put(Test.B, 2);
testMap.put(Test.C, 1);
System.out.println(gson.toJson(testMap));

What is the expected output? What do you see instead?
I would expect to have an output like this:
"aaa"
"bbb"
"ccc"
{"aaa":3,"bbb":2,"ccc":1}

However, the EnumMap class does not seem to take into account the 
@SerializedName annotation, and I obtain this instead:
"aaa"
"bbb"
"ccc"
{"A":3,"B":2,"C":1}

What version of the product are you using? On what operating system?
I'm using Gson 2.2.2 in Windows 7

Please provide any additional information below.
This problem is present in both serialization and deserialization. I have a 
Json file that I cannot modify, with map fields such as "Item_Value#Parameter". 
I would like to deserialize it avoiding the use of a Map<String, Integer> class 
if possible.

Original issue reported on code.google.com by FernA...@gmail.com on 22 Sep 2012 at 2:11

[GoogleCodeExporter]

I am new with Gson, but I managed to do this with a custom serializer and 
deserializer. Nevertheless, I still think this should be implemented without 
needing them:

GsonBuilder gb = new GsonBuilder();
Type t = (new TypeToken<Map<Test, Integer>>(){}).getType();
gb.registerTypeAdapter(t, new JsonSerializer<Map<Test,Integer>>(){

    @Override
    public JsonElement serialize(Map<Test, Integer> arg0, Type arg1, JsonSerializationContext arg2) {
        // TODO Auto-generated method stub
        JsonObject obj = new JsonObject();
        for (Test t : arg0.keySet()) {
            obj.add(arg2.serialize(t).getAsString(), new JsonPrimitive(arg0.get(t)));
        }
        return obj;
    }

});
gb.registerTypeAdapter(t, new JsonDeserializer<Map<Test,Integer>>(){

    @Override
    public Map<Test, Integer> deserialize(JsonElement arg0, Type arg1, JsonDeserializationContext arg2) throws JsonParseException {
        Map<Test, Integer> res = new EnumMap<Test, Integer>(Test.class);
        Entry<String, JsonElement> entry;
        Test tVal;
        Iterator<Entry<String,JsonElement>> it = arg0.getAsJsonObject().entrySet().iterator();
        while (it.hasNext()) {
            entry = it.next();
            tVal = arg2.deserialize(new JsonPrimitive(entry.getKey()), Test.class);
            res.put(tVal, entry.getValue().getAsInt());
        }
        return res;
    }

});
Gson gson = gb.create();

Map<Test, Integer> testMap = new EnumMap<Test, Integer>(Test.class);
testMap.put(Test.A, 3);
testMap.put(Test.B, 2);
testMap.put(Test.C, 1);
System.out.println(gson.toJson(testMap, t));

testMap = gson.fromJson(gson.toJson(testMap, t), t);
System.out.println(testMap.get(Test.A));
System.out.println(testMap.get(Test.B));
System.out.println(testMap.get(Test.C));

The output now is:
{"aaa":3,"bbb":2,"ccc":1}
3
2
1

Original comment by FernA...@gmail.com on 22 Sep 2012 at 4:34

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• Removed labels: ****

[GoogleCodeExporter]

I am encountering similar issue, I am using Gson on android. 

    public enum Mode {
        @SerializedName("no_account_creation")
        LOGIN, 
        @SerializedName("force_account_creation")
        REGISTER, 
        @SerializedName("auto")
        AUTO;
    }

On 2.3.6 and above:
Mode.AUTO serializes to "auto"

On HTC explorer 2.3.5 
Mode.AUTO serializes to "AUTO"

Is it possible that the fix of 
https://code.google.com/p/google-gson/issues/detail?id=347 
be somehow depended on the version of dvm?

Original comment by Platinum...@gmail.com on 18 Mar 2013 at 9:51

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• Removed labels: ****