Gson 获取不到 Mobile列

[assky124]

{
    "LinkmanID": 253442,
    "UnitID": 40919,
    "DeptName": null,
    "DeviceCategoryCode": "3000",
    "Type": "1035001",
    "LinkmanName": "张三",
    "Telephone": null,
    "Mobile": "1234567890123",
    "Fax": null,
    "Email": null,
    "PostCode": null,
    "Address": null,
    "Remark": null,
    "CreaterID": 111,
    "CreateDate": "2014-08-13T08:51:07.6",
    "LastEditorID": null,
    "LastEditDate": null,
    "DeviceCategoryName": null,
    "InspectTypeName": null,
    "DeviceCategoryCodeObject": null,
    "TypeObject": null,
    "InspectTypeID": 75
}

转成JsonObject
调试的时候监视

node.members.keySet().toArray()[7].equals("Mobile");//true
node.members.keySet().toArray()[6].equals("Telephone");//true
node.has("Telephone"); //true
node.has("Mobile"); //false

明显有Mobile这个属性，好像就是读取不到，其他的都可以

Mobile是Gson的关键字么？