localhost paavo # java-config -L
The following VMs are available for generation-2:
1)      Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2]
*)      Sun JDK 1.4.2.12 [sun-jdk-1.4]
3)      Sun JDK 1.5.0.08 [sun-jdk-1.5]
4)      Sun JRE 1.5.0.08 [sun-jre-bin-1.5]
localhost paavo # env-update && source /etc/profile
>>> Regenerating /etc/ld.so.cache...
localhost paavo # ACCEPT_KEYWORDS="~x86" emerge =dev-java/jython-2.1-r10
Calculating dependencies... done!

>>> Emerging (1 of 1) dev-java/jython-2.1-r10 to /
 * jython-2.1.tar.bz2 MD5 ;-) ...                                                                                     [ ok ]
 * jython-2.1.tar.bz2 RMD160 ;-) ...                                                                                  [ ok ]
 * jython-2.1.tar.bz2 SHA1 ;-) ...                                                                                    [ ok ]
 * jython-2.1.tar.bz2 SHA256 ;-) ...                                                                                  [ ok ]
 * jython-2.1.tar.bz2 size ;-) ...                                                                                    [ ok ]
 * checking ebuild checksums ;-) ...                                                                                  [ ok ]
 * checking auxfile checksums ;-) ...                                                                                 [ ok ]
 * checking miscfile checksums ;-) ...                                                                                [ ok ]
 * checking jython-2.1.tar.bz2 ;-) ...                                                                                [ ok ]
 * Using: blackdown-jdk-1.4.2