wlt nes-emu # emerge -pv --tree tomcat

These are the packages that I would merge, in reverse order:

Calculating dependencies ...done!
[ebuild  N    ] www-servers/tomcat-5.5.12  USE="-doc -examples -jaf javamail -jikes -source -test" 0 kB [1]
[ebuild  N    ]  dev-java/eclipse-ecj-3.1-r2  USE="-doc -jikes" 530 kB
[ebuild  N    ]  dev-java/jaxen-1.0  USE="-doc junit -source" 3,120 kB
[ebuild  N    ]   dev-java/jdom-1.0_beta9-r1  USE="-doc -jikes -source" 3,337 kB
[ebuild  NS   ]  dev-java/mx4j-3.0.1  USE="-doc -examples -jikes -source" 607 kB [1]
[ebuild  N    ]   dev-java/gnu-javamail-1.0  USE="-doc" 690 kB
[ebuild  N    ]    dev-java/gnu-classpath-inetlib-1.0-r1  USE="-doc" 147 kB
[ebuild  N    ]     dev-java/jessie-1.0.1  USE="-doc ssl" 819 kB [1]
[ebuild  N    ]      dev-java/gnu-classpath-0.19  USE="alsa -cairo -debug -dssi -examples -gcj gtk qt xml2" 0 kB [1]