Holiday data classes, for ICU4J, are missing for many regions and languages.
With this ticket data for Swedish holidays are submitted.
I have used one constructor for Easter holidays that are no longer holidays, with a terminating year. That constructor in not defined in the ICU4J holiday framework.
I think this data would be better as part of CLDR (in a suitable form for CLDR), not just ICU4J in the form of Java classes.