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> Wich WildFly version should I use ?
I recommend to use the latest version 12, contains the latest fixes.
> Are there any development work to migrate ?
Generally yes, it is expected to be minor work, but as I do not know you application, it is difficult to say what should be done.
> How to change configurations (like standalone.xml) ?
I recommend to do a diff between them and migrate the differences. There should be some deprecated attributes or configurations, but each error should be resolved on demand. Post the errors here.
Thank you very much Claudio Miranda to help me on this topic, Your help is very useful and saves my day. I can give you may application details after discussing with my developers. For the configuration changes, I will try as you mentioned and I will post here If I have any errors.