Hello Andrea As you said the fetch type (not fetch mode, I misunderstood) should be lazy and not eager. I have modified the test case and it fails with @Proxy(lazy=false) while it works without @Proxy(lazy=false). I have the same behaviour with my real code base: a stackoverflow with @Proxy(lazy=false) and no error without it. To be honest I’m not sure how it could have worked with Hibernate 5, I guess that at some point it was using some proxies |