GWT Deserialisation of Persistent Entities (JPA)
- by slartidan
Hi everyone,
I am currently developing Java/GWT-application which is hosted on a weblogic application server. I am using EJB3.0 with EclipseLink as persistence layer. Sadly my GWT has problems to deserialize persistent entities.
It might be helpful for you to know, that I
have the EclipseLink-Library in my classpath (including javax.persistence.Entity)
am not recieving the persistence objects from a database or persistence-manager - I am creating the objects with standard java code
use Eclipse IDE for Java EE Developers for development and deploying and I am compiling my GWT code with the GWT-Plugin (GWT 2.1.0) - my source code is split up in several projects
am pretty sure, that the problems occures on client side, since the HTTP response of my server is the same in my working and in my not working example
tried to patch javax.persistence.Entity and tried to include several libraries which included javax.persistence.Entity but nothing was helping
In my server provides a list of instances of class SerialClass; the interface looks like this:
public interface GreetingService extends RemoteService {
List<SerialClass> greetServer();
}
My onModuleLoad()-Method gets those instances and creates a browser-popup with the information:
public void onModuleLoad() {
GreetingServiceAsync server = (GreetingServiceAsync) GWT.create(GreetingService.class);
server.greetServer(new AsyncCallback<List<SerialClass>>() {
public void onFailure(Throwable caught) {
}
public void onSuccess(List<SerialClass> result) {
String resultString = "";
try {
for (SerialClass serial : result) {
if (serial == null) {
resultString += "null ";
} else {
resultString += ">" + serial.id + "< ";
}
}
} catch (Throwable t) {
Window.alert("failed to process");
}
Window.alert("success:" + resultString);
}
});
}
My server is looking like this:
public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService {
public List<SerialClass> greetServer() throws IllegalArgumentException {
List<SerialClass> list = new ArrayList<SerialClass>();
for (int i = 0; i < 100; i++) {
list.add(new SerialClass());
}
return list;
}
}
Case 1 = everything works fine
I am using this SerialClass (either without any annotation, or with any annotation other than Entity - for example javax.persistence.PersistenceContext works fine):
//@Entity
public class SerialClass implements Serializable, IsSerializable {
public int id = 4711;
}
The popup contains (as expected):
success:>4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711< >4711<
The data sent over HTTP looks like this:
//OK[4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,100,1,["java.util.ArrayList/3821976829","serial.shared.SerialClass/10650133"],0,6]
Case 2 = its not working at all
I am using this SerialClass:
@Entity
public class SerialClass implements Serializable, IsSerializable {
public int id = 4711;
}
My popup contains (THIS IS MY PROBLEM):
success:>2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null >2< null
The data sent over HTTP looks like this (exactly the same!):
//OK[4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,4711,2,100,1,["java.util.ArrayList/3821976829","serial.shared.SerialClass/10650133"],0,6]
There is no suspicious logging output - neither on server, nor on client. All HTTP-responses have return code 200.
My current workaround
I am going to try to create transfer objects as a copy of my SerialClass - those transfer objects will look exactly the same, but will not have the @Entity annotation.
Alternatively I could try to use the RequestFactory (thanks to @Hilbrand for the hint).
I really don't know how to solve that problem and I'm really thankful about any suggestions, hints, tips, links, etc.
