hello,
I have problem with complex object tree being passed from client side
to server side via RequestFactory:
my proxy interfaces for my model:
@ProxyFor(value = ProductMargin.class, locator =
ProductMarginLocator.class)
public interface ProductMarginProxy extends EntityProxy {
public long getId();
public void setId(long id);
ProductProxy getProduct();
void setProduct(ProductProxy group);
}
@ProxyFor(value = Product.class)
public interface ProductProxy extends ValueProxy {
String getVendorId();
void setVendorId(String title);
GroupProxy getGroup();
void setGroup(GroupProxy group);
}
@ProxyFor(value = Group.class)
public interface GroupProxy extends ValueProxy {
public long getId();
public void setId(long id);
}
the model is as simple as the proxies:
@Entity
public class Group {
@Id
private long id;
//setters and getters ommited
}
@Entity
public class Product {
@Id
private String vendorId;
@NotNull
@ManyToOne(cascade = CascadeType.ALL)
private Group group
//setters and getters ommited
}
@Entity
public class ProductMargin {
@Id
private long id;
@ManyToOne
private Product product;
//setters and getters ommited
}
i try to create new margin for product by using code:
ProductProxy product; //being read much ealier, wipeout to
make code clear. double checked, is not null, has a property group
initalized properly
ProductMarginRequest request =
requestFactory.productMarginRequest();
margin = request.create(ProductMarginProxy.class);
margin.setProxy(product);
request.persist(margin).with("product").fire(new
Receiver<Void>() {
@Override
public void onSuccess(Void response) {
Window.alert("success!");
}
});
calling this code produces such error:
00:32:58.409 [ERROR] Uncaught exception escaped
java.lang.NullPointerException: null at
com.google.gwt.requestfactory.shared.impl.AbstractRequestContext
$MyViolation.<init>(AbstractRequestContext.java:87) at
com.google.gwt.requestfactory.shared.impl.AbstractRequestContext
$4.onTransportSuccess(AbstractRequestContext.java:629) at
com.google.gwt.requestfactory.client.DefaultRequestTransport
$1.onResponseReceived(DefaultRequestTransport.java:136) at
com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:
287) at com.google.gwt.http.client.RequestBuilder
$1.onReadyStateChange(RequestBuilder.java:395) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25) at java.lang.reflect.Method.invoke(Method.java:597) at
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71) at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
157) at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
326) at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
207) at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
129) at
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
561) at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
269) at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
91) at com.google.gwt.core.client.impl.Impl.apply(Impl.java) at
com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214) at
sun.reflect.GeneratedMethodAccessor151.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25) at java.lang.reflect.Method.invoke(Method.java:597) at
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71) at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
157) at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
281) at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
531) at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
352) at java.lang.Thread.run(Thread.java:662)
but if you investigate a little bit more and put debug breakpoint in
method
private void doFire(final Receiver<Void> receiver) from class
AbstractContextRequest on line 613 which is
....
608 requestFactory.getRequestTransport().send(payload, new
TransportReceiver() {
609 public void onTransportFailure(ServerFailure failure) {
610 fail(receiver, failure);
611 }
612 public void onTransportSuccess(String payload) {
613 ResponseMessage response = AutoBeanCodex.decode(
MessageFactoryHolder.FACTORY, ResponseMessage.class,
payload).as();
...
you will see that the payLoad is:
{"X":[{"M":"may not be null","P":"group","C":
2,"R":"1","T":"pl.myapp.shared.proxy.ProductProxy"}]}
while debugging I checked that GroupProxy property what set till
calling makePayload() method by the AbstractContextRequest which I
think causes problem.
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