final properties isn't serilised from java to flex

At Java side I have this class:

public final class TitleName {
@NotNull
public final Integer id;
@NotNull
public final String name;
...
}

that at Flex side I try to use as Dynamic Object. But calling Java service and obtainin this object as call result at Flex side I've got empty Object without any property. When I remove final declaration from Java fields all works correctly and at Flex I have Objects with id and name.

Is this a bug?