No-args constructor for class X does not exist. Register an InstanceCreator with Gson for this type to fix this problem.，allargsconstructor

No-args constructor for class X does not exist. Register an InstanceCreator with Gson for this type to fix this problem.，allargsconstructor

Gson解析JSON字符串時出現了下面的錯誤：

No-args constructor for class X does not exist. Register an InstanceCreator with Gson for this type to fix this problem.

解決的辦法是把對應的Class改成靜態類。