user2507946 has the right answer in your comments.
int
is not nullable in Java but you can substitute the wrapper class Integer
to handle null values.
Example
public String userName;
public Integer[] msgArr;
...
Question
Json String
{"userName":null," msgArr":[null],"numrow":0} //String result
Gson
new Gson().fromJson(result, MyClass.class);
MyClass
public String userName;
public int[] msgArr;
...
Error Stack
at java.lang.IllegalArgumentException: Primitive array can't take null values.
at java.lang.reflect.Array.set(Array.java:406)
at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:78)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.Gson.fromJson(Gson.java:803)
at com.google.gson.Gson.fromJson(Gson.java:768)
at com.google.gson.Gson.fromJson(Gson.java:717)
at com.google.gson.Gson.fromJson(Gson.java:689)
at com.test.dao.RequestBase.onPostExecute(RequestBase.java:79)
How can avoid this exception if I can not change json string "msgArr=[null]"?
Solution
user2507946 has the right answer in your comments.
int
is not nullable in Java but you can substitute the wrapper class Integer
to handle null values.
Example
public String userName;
public Integer[] msgArr;
...
OTHER TIPS
Gson gson = new GsonBuilder
.serializeNulls()
.create();