RequirementImpl must implement serializable, needs to have a default 
constructor (visibility does not matter), no final fields and there must be 
at least one serializable type found for each field that can be assigned to 
that field (which must meet the same requirements). Also if you do not 
transfer RequirementImpl directly but instead an interface that 
RequirementImpl implements, then GWT Compiler needs to see the class+source 
of RequirementImpl so it can treat RequirementImpl as a possible concrete 
type that might be transferred. 

Have you double checked these requirements? 

-- J.


Am Dienstag, 25. August 2020 17:11:53 UTC+2 schrieb Guillen Antonio:
>
> HI all,
>
> I use GWT 2.81 and EMF (Eclipse Modeling Framework) when i want send from 
> the server to the client an object of my model, I obtain this final error:
> 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)
>
> I have tried to understand how to use serializationWhitelist but I have no 
> clear example.  The class RequirementImpl contains List, so I tried to 
> create ArrayList with the good type, but same pb.
>
> Can you help me, at least give me where found a claer explanation. 
>
> Tanks a lot 
> Antonio Guillen
>

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