Question

I am using GSON library for turing JSON that comes form a web service but I can’t make it work, I always get a null. I’ve looked through similar issues like Converting Json to Java such as Simple Json to Java convertion using GSON. But I am still missing something

JSON

{"A":"val1","B":"val2","C":"val3","D":"val4","E":"val5","F":"val6","G":"val7"}
         SiteWrapper m = gson.fromJson(json, SiteWrapper.class);

java Class

SiteWrapper m = gson.fromJson(json, SiteWrapper.class);
System.out.println(m.getMenu());

static class Site {
    static String A;
    static String B;
    static String C;
    static String D;
    static String E;
    static String F;
    static String G;

    public String toString() {
        return String.format(A,B,C,D,E,F,G);}

    public static String getA() {
        return A;
    }
    public static String getB() {
        return B;
    } 
... all the way to getG

    public void setA(String A) {
        Site.A = A;
    }
    public void setB(String B) {
        Site.B = B;
    }
... all the way to setB

and my wrapper

class SiteWrapper {
    private Site site;
    public Site getMenu() { return site; }
    public void setMenu(Site site) { this.site = site; }
}

no matter what I do I get a null printed , any ideas?

Answer 1

Since its a static inner class .As docs pointed out and comments :

As well, if a field is marked as “static” then by default it will be
excluded. If you want to include some transient fields…

You may want to try

 Gson gson = new GsonBuilder()
    .excludeFieldsWithModifier()
    .create();

Also, since its a inner class you may need to change your JSON If you can:

 {
   "site":{
      "A":"val1",
      "B":"val2",
      "C":"val3",
      "D":"val4",
      "E":"val5",
      "F":"val6",
      "G":"val7"
   }
}

As noted here in this post