Brand new FC4T3 which javac /usr/bin/javac ls -l /usr/bin/javac /usr/bin/javac -> /etc/alternatives/javac ls -l /etc/alternatives/javac /etc/alternatives/javac -> /usr/lib/jvm/java-1.4.2-gcj/bin/javac OK, so I would expect javac to gc gcj, but watch: javac Eclipse Java Compiler 0.548, pre-3.1.0 milestone-6, Copyright IBM Corp 2000, 2005. All rights reserved.