Hello everybody,
I am new to GWT and want to have a service that transfers an Image
object (com.google.gwt.user.client.ui.Image) back to the client.
(Using GWT 2.0.0 with Eclipse Galileo and Eclipse GWT plugin).
On the client, I have the following service method:
import com.google.gwt.user.client.ui.Image;
Image getImage();
and the following service async method:
import com.google.gwt.user.client.ui.Image;
void getImage(AsyncCallback<Image> callback);
On the server, I have the following service implementation:
import com.google.gwt.user.client.ui.Image;
@Override
public Image getEventTimeline() {
// 1) code to generate image from data
// 2) create new image and return to client
Image image = new Image("test.png");
return image;
}
When I compile the code, I get the following error:
....[ERROR] com.google.gwt.user.client.ui.Image is not assignable to
'com.google.gwt.user.client.rpc.IsSerializable' or
'java.io.Serializable' nor does it have a custom field serializer
(reached via com.google.gwt.user.client.ui.Image)
[ERROR] com.google.gwt.user.client.ui.Image has no
available instantiable subtypes. (reached via
com.google.gwt.user.client.ui.Image)
[ERROR] subtype
com.google.gwt.user.client.ui.Image is not assignable to
'com.google.gwt.user.client.rpc.IsSerializable' or
'java.io.Serializable' nor does it have a custom field serializer
(reached via com.google.gwt.user.client.ui.Image)....
This suggests that an Image cannot be serialized. I have two questions
about this:
1) Isn't every Google object serializable by default. Otherwise, what
is the point of having a separate image class in GWT?
2) What is the proper way of doing this? I want to create the image
server-sided every time a user clicks a button and return it back to
the user where it is supposed to be displayed in a panel.
Any suggestions?
Thanks a lot,
Ralf
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