Deserialization with Gson.fromJson() should *ignore* missing fields

What steps will reproduce the problem?

1. Create a simple *non-static* class which initializes default values for some 
fields:

    public class Test {

        int x = -1;
        String s = "Hello";
    }

2. Create new Gson and call `fromJson()` with missing fields:

    Test t = new Gson().fromJson("{}", Test.class);
    System.out.println(String.format("x=[%s] s=[%s]", t.x, t.s));

>> Results: x=[0] s=[null]

    Test t = new Gson().fromJson("{\"x\": 1}", Test.class);
    System.out.println(String.format("x=[%s] s=[%s]", t.x, t.s));

>> Results: x=[1] s=[null]

What is the expected output? What do you see instead?

As the test cases, I would like to expect default value for each field to be 
the one that the class initializes. For instance with the first test case, `x` 
should be `-1` and `s` should be "Hello".

What version of the product are you using? On what operating system?

 - Gson 2.2.3
 - OSes:
   + Fedora 18, 64 bit with OpenJDK 1.7.0_19;
   + Android API 4 and API 17;

Thanks,
Hai

Original issue reported on code.google.com by [e-mail] on 5 May 2013 at 8:23

[a1573595]

Still a problem.

[transilvlad]

Any update on this?