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EMF, GWT ELIST and serialisation [message #1831627]

Tue, 25 August 2020 11:59

Eclipse User

Hi all
I start a new project using GWT (Google Window Toolkit) and EMF (like in classical project of eclipse).
I have a pb if my object contains EList it's impossible to serialize it, event if when I create the Elist I use an ArrayList<MyClass> or a BasicEList<MyClass> where MyClass is the class of the objects managed in my list and even if in MyClass there is no EList.
Can you help me, with an example?

Here is the error code obtained:
com.google.gwt.user.client.rpc.SerializationException: Type 'com.lacen.organisation.impl.RequirementImpl' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = com.lacen.organisation.impl.RequirementImpl@2fa144e7 (name: Fkygrdphgf)

Thanks in advance

Regards Antonio

Re: EMF, GWT ELIST and serialisation [message #1831642 is a reply to message #1831627]

Wed, 26 August 2020 01:26

Eclipse User

GWT relies on a "whitelist" to support serialization:

http://www.gwtproject.org/doc/latest/FAQ_Server.html#Does_the_GWT_RPC_system_support_the_use_of_java.io.Serializable

The URI service has this method to help generate such a whitelist:

org.eclipse.emf.ecore.resource.URIService.whiteList(WhiteList)

If you look at the type hierarchy of org.eclipse.emf.ecore.resource.URIService.WhiteList you'll see that each generated package has a sublass of this which references each class and data type in your model. Your model should have that too, assuming you've set the GenModel's Runtime Platform to GWT.

You'll need to ensure that your service is also making use of this.

It's been a extremely long time since I used GWT, so I can't offer much in the way of assistance.

Re: EMF, GWT ELIST and serialisation [message #1831670 is a reply to message #1831642]

Wed, 26 August 2020 05:52

Eclipse User

HI Ed,

Thanks a lot for your help. My model contains the static class extending WhiteList ( Ihave GWT as target Paltform):

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public static class WhiteList implements IsSerializable, EBasicWhiteList {
		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		protected Customer customer;

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		protected Organisation organisation;

		/**
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		protected Requirement requirement;

And Requirement (intreface is here too).

So, you said also "You'll need to ensure that your service is also making use of this.". What do you mean? in my declaration of service I use this:

@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
	Customer greetServer(String name) throws IllegalArgumentException;

Do you want say that I must extend URIService and note RemoteService??

Sory but for me all this is not clear. I was tinking that the pb was comming from the fact that EMF generate references as EList and EList extend List and a List is not serialisable. All this is for me is too strange.

Thanks a lot for your help
Antonio

Re: EMF, GWT ELIST and serialisation [message #1831676 is a reply to message #1831670]

Wed, 26 August 2020 08:00

Eclipse User

It's probably sufficient that you use the URISerivce.WhiteList interface your your Greeting service just like the URIService does. I.e., URIService.WhiteList whiteList(URIService.WhiteList whiteList) in the interface. And a method implementation that just returns null. But I'm just guessing... (The EList implementation classes are serializeable.)

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