Hi, I'm encountering a problem that I can't work out related to RPC
and inheritence - the instance variable in my parent class didn't get
serialized. I'm using GXT for my project. Below are my code snipplet:
/* The data that are transmitted over the wire */
public abstract class MyModelData implements ModelData {
private String oldData = null;
protected String setOldData(String s) { oldData = s; }
}
public class ActualModelData extends ModelData implements Serializable
{
private String someData = null;
// some other strings as well
public ActualModelData() { super(); }
/* basically lets me change the primary key */
public void setData(String s) {
setOldData(someData);
oldData = s;
}
// Other getters/setters as required by ModelData
}
/* Server */
// ...the interfaces as required
// inside MyServiceImpl:
bool change(ActualModelData serverData) {
// do stuff
}
/* Client */
public class MyUI extends LayoutContainer {
// ...
// ActualModelData clientData; -- instance variable originally came
from server
clientData.setData(blah);
myService.change(clientData, new AsyncCallbackBoolean() {
public void onFailure(Throwable error) {}
public void onSuccess(Boolean result) {}
});
The problem: serverData.oldData == null (both hosted and compiled
modes)
I've stepped through the code in Eclipse:
In the client code, the clientData.oldData is definitely correctly set
when the change method was called (and was subsequently reset to
null elsewhere in the client code).
On the server side, serverData.oldData is null - I've even stepped
through the code before mine, and found that the String requestPayload
in RemoteServiceServlet.processPost(HttpServletRequest,
HttpServletResponse) doesn't contain any trace of the oldData value
(don't know how to read that string, but I've found the substring
representing the class type, followed by the known values of non-null
instance variables in ActualModelData).
I've tried deleting the folder with the hosted.html and the *.gwt.rpc
files and getting Eclipse to rebuild them, but the problem persists.
I'm now not show how to proceed other than flattening the class
structure (I can remove the hierarchy but then I won't be able to use
a single data grid to edit all my data types).
GWT version: 2.0.4
GWT Designer version: 8.0.0
AppEngine: 1.3.7
GXT version: 2.20
JRE: 1.6.0_20
Thanks
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