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)
- Should support custom serializers for map keys HOT 4
- please add support for getter method HOT 1
- Permit type data in the serialized JSON HOT 7
- Unbearable when toJson a long string(1M) HOT 2
- Gson should provide a way to configure order for field navigation HOT 5
- Not able to deserialize. HOT 2
- Not able to deserialize. HOT 3
- support java.sql.Date and Timestamp types HOT 6
- Having an inner class gives this error - No-args constructor for B does not exist. HOT 1
- Extend Expose annotation to support classes HOT 3
- Support circular references HOT 18
- Gson should have a way to provide custom exclusion strategies HOT 2
- all should be strings HOT 2
- Error Deserializing objects using fromJson(string, type) HOT 4
- com.google.gson.Gson should be able to toJson JsonElements/JsonObjects HOT 3
- Deserialization/Serialization issue when json is injected via spring annotations HOT 5
- Set formatting style in pretty printing HOT 1
- suggestion: Add @Verification annotation for easy verification of POJO validity HOT 6
- compilation via maven fails due to generics bug in javac HOT 1
- Gson needs a more obust inclusion and exclusion mechanism HOT 3
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