I had the same problem in my project and the only thing i changed was creating an instance of my EmbeddedId in the Entity class. It looked something like this.

@EmbeddedId ListyHoteliKey id = new ListyHoteliKey();

After that everything was warking perfect but i am not an expert when it coms to Spring and java so it might have some consequences in other places in the code i am not aware of.