I use eclipse 3.1.1, when I edit a java file and press on F4 nothing happens. When I right click on a class name in the java editor, the "Open Type Hierarchy" menu entry should be associated with the F4 key (like "Open Declaration" menu entry is associated with F3). Note that in the eclipse preferences, F4 is assigned to "Open Type Hierarchy". This bug happens only in gentoo linux, the F4 key is working fine for eclipse in Debian sarge
Tested in eclipse-sdk-3.2.1 and works fine. Sorry about no-one responding to this bug.