With 6.2.0.CR3 the original problem still exists.

When I remove @Type(JsonType.class) from properties I still get {{Cannot construct instance of org.hibernate.bugs.entities.PropertyTypeA (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('

')}}

When I add an empty constructor for PropertyTypeA that takes a String it works.

So my solution currently looks like this

    public PropertyTypeA(String json) {
        // Hibernate needs this constructor, but doesn't use it :-)
        // See https://hibernate.atlassian.net/browse/HHH-15929
    }

🙂