doc@itchy ~ $ /usr/bin/java-check-environment
 * === Java Environment Checker ===
 * The purpose of this script is to check the sanity of your Java Environment.
 * We have significantly changed and improved the way Java is handled in many respects.
 * Please refer to http://www.gentoo.org/proj/en/java/java-upgrade.xml for details

 * Checking vm_environment_files ...
 * Generation-1 configuration files were found in /etc/env.d/java
 * Please run the following to remove them:
# rm /etc/env.d/java/20blackdown-jre-1.4.2.03 /etc/env.d/java/20sun-jdk-1.4.2.10

 * You must then update your VMs to Generation-2 by running:
# emerge -atv =blackdown-jre-1.4* =sun-jdk-1.4*

 * If you've done this already, but java-check-environment
 * still prompts you to emerge the same things, be sure that
 * you have the latest version of each package unmasked and
 * keyworded properly.                                                                    [ !! ]
 * Some problems were found. Please follow the instructions above, and rerun java-check-environment