Why parsing Invalid json returns Empty Object

Question

I am trying to parse wrong json string to the data class. Ideally it should throw JsonSyntaxException but its

 class MyStudent{
  int age;
  int marks;
  Student(int a, int m){
   age = a;
   marks = m;
  }
 }

I am parsing "{name:test}" and this returns me Object of MyStudent with no data inside it.

Gson gson = new Gson();
    try {
        return gson.fromJson(json, MyStudent.class);
    } catch (JsonSyntaxException e) {
        return null;
    }

Can someone please let me know isn't this expected?