icedtea-sound is currently hardwired to ancient Java. Attached patches make it work on openjdk11+ (tested with openjdk17, tuxguitar that makes use of it and pipewise, my openjdk17 has no alsa support for good measure).
Created attachment 827953 [details, diff] icedtea-sound-1.0.1-openjdk11.patch Primary trivil patch
Created attachment 827955 [details, diff] Example ebuild patch Example ebuild patch. Probably not suitable for production as it hard-depends on openjdk11+.
Package removed.