creating a GWT ValueProxy and sending to a service method - gwt

Question

I want to call a method on a Service with a ValueProxy param - if I do personProxy.setName("test") and then request.callFn(personProxy).fire(), the name property doesn't get passed to server.
Should I do a request.edit(personProxy) before setting the name or something else?
This is the implementation I'm using:
//somewhere in MyActivity.java ...
PersonProxy cp = requestFactory.myRequest().create(PersonProxy.class);
cp.setName("John Doe");
requestFactory.myRequest().doSomething(cp,"extra_param_value").fire(new Receiver<List<PersonProxy>>() {
#Override
public void onSuccess(List<PersonProxy> response) {
//response from server...
}
});
//------------------------
public interface MyRequestFactory extends RequestFactory {
MyRequest myRequest();
}
//------------------------
#ServiceName(value="com.server.MyService", locator="com.server.MyServiceLocator")
public interface MyRequest extends RequestContext {
public Request<Integer> doSomething(PersonProxy param, String extraParam);
}
//------------------------
public class MyServiceLocator implements ServiceLocator {
public Object getInstance(Class<?> clazz) {
return new MyService();
}
}
//------------------------
public class MyService {
public Integer doSomething(Person param, String extraParam) {
System.out.println("person.name="+param.getName()); ---> prints NULL!!! why?
return 0;
}
}
//------------------------
#ProxyForName(value="com.server.Person")
public interface PersonProxy extends ValueProxy {
String getName();
void setName(String name);
}
//-----------------------
public class Person {
public Person() {
super();
}
protected String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Thanks.

Answer 1

The PersonProxy is being created by one instance of a RequestContext and used in another. Turns out there's a bug in AbstractRequestContext.retainArg() that should have thrown an exception to tell you about the API mis-use. Editable proxies aren't supposed to be usable between different RequestContext instances.
TreeRequest ctx = factory.treeRequest();
PersonProxy person = ctx.create(PersonProxy.class);
person.setName("John Doe");
ctx.doSomething(person, "more stuff");
As discussed on IRC, the -Dgwt.rpc.dumpPayload=true JVM flag can be turned on when trying to diagnose where data is going (or isn't).