Comments (3)
Original comment by [email protected]
on 31 Jul 2008 at 12:59
- Changed state: Accepted
from google-gson.
You need to handle top-level "Parameterized" types differently than Class
objects.
Due to "Type Erasure" in the Java language, when you pass in a instance of the
"Map"
object, all generic information is lost. To get around this problem, we
overloaded
the toJson method to take a "Type" parameter.
Here is an example:
import com.google.gson.reflect.TypeToken;
public class TopLevelMapExample {
public static void main(String[] args) {
Type mapType = new TypeToken<Map<String, String>>() {}.getType();
String json = new Gson().toJson(new HashMap<String, String>(), mapType);
System.out.println(json);
}
}
----
I am updating the code to throw an IllegalArgumentException with a very
descriptive
message.
Original comment by [email protected]
on 31 Jul 2008 at 7:25
- Changed state: Invalid
from google-gson.
r128 changed the code to raise a IllegalArgumentException instead.
Original comment by [email protected]
on 31 Jul 2008 at 7:57
from google-gson.
Related Issues (20)
- Make it possible to allow comments in JSON HOT 4
- Typo HOT 1
- Map key can not use java bean. HOT 1
- Deserialization of List with one item HOT 1
- Does gson should work for a Blackberry application? HOT 4
- primitive type support HOT 1
- Nested generic collections don't return jsonized values on toJson HOT 14
- Support surrogate pairs HOT 3
- It is not supporting ot CachedRowSet objet HOT 1
- Gson can't parse JSON text encoded in UTF-8? HOT 1
- Locale on Date Format HOT 2
- Add option to provide Locale for DateFormat HOT 6
- Not able searialize HashMap and adding instance into JSON HOT 7
- Implement equals() to perform deep-value-comparison HOT 1
- Enum with body does not serialize HOT 2
- Map<String, ...> with empty strings (or strings consisting of whitespace) don't serialize HOT 3
- Maps do not serialize usefully HOT 2
- Missing sources in Maven repository HOT 3
- GsonBuilder setDateFormat ignored HOT 9
- First class support for polymorphism (subclasses!) HOT 17
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