Exception when deserializing Double.NaN, Double.NEGATIVE_INFINITY and Double.POSITIVE_INFINITY

[GoogleCodeExporter]

What steps will reproduce the problem?

public class GsonDouble
{
    private double negInf = Double.NEGATIVE_INFINITY;
    private double posInf = Double.POSITIVE_INFINITY;
    private double notANumber = Double.NaN;
    private double number = 2.0;

    public static void main(String[] args)
    {
        Gson gson = new Gson();

        String json = gson.toJson(new GsonDouble());
        System.out.println(json);

        GsonDouble gsonDouble = gson.fromJson(json, GsonDouble.class);

    }
}

Exception in thread "main" com.google.gson.JsonParseException: Failed
parsing JSON source: java.io.StringReader@134bed0 to Json
    at com.google.gson.Gson.fromJson(Gson.java:376)
    at com.google.gson.Gson.fromJson(Gson.java:321)
    at com.google.gson.Gson.fromJson(Gson.java:297)
    at GsonDouble.main(GsonDouble.java:29)
Caused by: com.google.gson.TokenMgrError: Lexical error at line 1, column
12.  Encountered: "I" (73), after : ""
    at
com.google.gson.JsonParserTokenManager.getNextToken(JsonParserTokenManager.java:
999)
    at com.google.gson.JsonParser.jj_consume_token(JsonParser.java:366)
    at com.google.gson.JsonParser.Digits(JsonParser.java:267)
    at com.google.gson.JsonParser.JsonInt(JsonParser.java:241)
    at com.google.gson.JsonParser.JsonNumber(JsonParser.java:192)
    at com.google.gson.JsonParser.JsonValue(JsonParser.java:131)
    at com.google.gson.JsonParser.Pair(JsonParser.java:78)
    at com.google.gson.JsonParser.Members(JsonParser.java:61)
    at com.google.gson.JsonParser.JsonObject(JsonParser.java:42)
    at com.google.gson.JsonParser.parse(JsonParser.java:11)
    at com.google.gson.Gson.fromJson(Gson.java:370)
    ... 3 more


The serialized String looks as follows:

{"negInf":-Infinity,"posInf":Infinity,"notANumber":NaN,"number":2.0}

I guess the serialization is ok, since JavaScript uses Number.NaN,
Number.NEGATIVE_INFINITY and Number.POSITIVE_INFINITY and the text
representation fits the above JSON string.
The deserializer seems to be unaware of this.

I would be great if you could fix this for the upcoming release.

Original issue reported on code.google.com by nit...@googlemail.com on 12 Dec 2008 at 1:09

[zipswich]

The same problem with Float.POSITIVE_INFINITY and Float.NEGATIVE_INFINITY as of V2.8.4.

[hanslovsky]

@zipswich, what error message do you observe? I see

Caused by: java.lang.IllegalArgumentException: -Infinity is not a valid double value as per JSON specification. To override this behavior, use GsonBuilder.serializeSpecialFloatingPointValues() method.

and when I use

GsonBuilder.serializeSpecialFloatingPointValues() 

to create my Gson I can serialize both float and double infinities and NaNs (on version 2.8.5)