Map serialization fails about google-gson

[GoogleCodeExporter]

Original comment by [email protected] on 31 Jul 2008 at 12:59

• Changed state: Accepted

[GoogleCodeExporter]

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

[GoogleCodeExporter]

r128 changed the code to raise a IllegalArgumentException instead.

Original comment by [email protected] on 31 Jul 2008 at 7:57