I needed asm 4.0_RC1 for LWGJL 2.8.2. Unfortunately it isn't compatible with 4.0 final, which was released shortly afterwards. Ebuilds for both versions are now in java-overlay. I would only move 4.0 to the tree though.
*** Bug 392957 has been marked as a duplicate of this bug. ***
*asm-4.0 (25 Dec 2011) 25 Dec 2011; Miroslav Šulc <fordfrog@gentoo.org> +asm-4.0.ebuild: Version bump (thanks to James Le Cuirot <chewi@aura-online.co.uk> for the ebuild) @chewi: i did not remove the ebuild from java-overlay as i am not sure whether you want to keep it there or you wanna remove it.