There seems to be no read conversation for columns with a set of enumerations. The writing is okay as the enumerations are written as a set of text values. The reading leads to a set of type Set<MyEnumeration> holding string values.
My column definition is:
and the correspending java definition is:
A solution for my issue was to write and register custom @WritingConverter (MyEnumeration, String) and @ReadingConverter (String, MyEnumeration).
The resolution of a single EnumerationType to Text (Cassandra) works as it should.
The necessary new EnumNameCodec<>(MyEnumeration.class) is registered properly.