Run "which java" at a prompt to see which java binary is being executed. If it's /usr/bin/java, make sure that it's a link to the binary in $JAVA_HOME/bin. If it's an actual binary in /usr/bin, it's probably Kaffe, and you can uninstall it. The Java install instructions on Sun's site said to put $JAVA_HOME/bin in your PATH and that worked for me.