This is a replicate of Gentoo bug 467168 (filed against dev-java/oracle-jdk-bin on ARM) but for dev-java/sun-jdk and dev-java/sun-jre-bin on ia64 (dev-java/oracle-jdk-bin and dev-java/oracle-jre-bin aren't available for ia64). Java Control Panel installation should probably be protected with conditional check on arch in dev-java/sun-jdk and dev-java/sun-jre-bin ebuilds to prevent emerge from failing.
sun-jdk is long gone and we just dropped java on ia64 anyway.