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)
- Serialization in order
- caching object keys
- StackOverflowError with Java 1.8 using toJason on a object containing a KeyEvent
- Documentation missing for built-in serializers
- java.io.NotSerializableException: com.google.gson.internal.LinkedTreeMap$1 HOT 2
- StackOverFlow while converting a null object to json
- Correct JsonWriter class-level Javadoc
- Error desirialization of ConcurrentNavigableMap
- FutureTypeAdapter.read() throws unhelpful exception HOT 2
- Patch for /trunk/gson/src/main/java/com/google/gson/JsonDeserializer.java
- LazilyParsedNumber does not implement eqals and hashCode methods HOT 2
- private inheritance
- convert string to JSON with special character \u
- JsonElement's getAsInt() doesn't throw an Error when converting an too big exponential value HOT 1
- phone
- UI ISSUE IN DROPDOWN LIST
- Disable @SerializedName usage via GsonBuilder
- Gson not populating fields on Object created with InstanceCreator
- Support Java 8 time: Instant, LocalDate, LocalTime, ZonedDateTime ...
- lenient flag ignored in JsonWriter#value(double)
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