[bug] sub class field missing during serialization if collection's element type is a WildcardType #1870
Description
I am serializing a list like this:
List<? extends TestBeanBase> list1;
list1.add(new TestBeanSub()); // TestBeanSub is a child class of TestBeanBase
I find that the fields of TestBeanSub is missed in the serialized json.
You can try my example code：
@Test
public void testList() {
List<TestBeanBase> list = new ArrayList<>();
//base class
TestBeanBase baseBean = new TestBeanBase();
baseBean.a = "1";
list.add(baseBean);
//sub class
TestBeanSub subBean = new TestBeanSub();
subBean.a = "1";
subBean.b = "2";//b is a field declared in sub class, this field value is missed during serialization
list.add(subBean);
TestBeanList beanList = new TestBeanList();
beanList.list1 = list;
Gson gson = new GsonBuilder().setPrettyPrinting().create();
System.out.println(gson.toJson(beanList));
}
public static class TestBeanList {
public List<? extends TestBeanBase> list1; //element type is a WildcardType
}
public static class TestBeanBase {
public String a;
}
public static class TestBeanSub extends TestBeanBase {
public String b;
}Output json :
{
"list1": [
{
"a": "1"
},
{
"a": "1" //field b is missed
}
]
}