@Override
    public String messageName()
    {
        return Object.class.getSimpleName();
    }
Will be used if either {@link RuntimeEnv#POJO_SCHEMA_ON_COLLECTION_FIELDS} or 
{@link RuntimeEnv#POJO_SCHEMA_ON_MAP_FIELDS} is set.

Applies to a field which is an interface and the type is assignable from Collection or Map.

@author David Yu
@created May 19, 2016
protostuff-runtime/src/main/java/io/protostuff/runtime/PolymorphicPojoSchema.java