POSTIN

/bin/sh

for app in jar rmic rmiregistry grepjar java; do
  # Remove binaries if not alternativeszificated yet
  [ ! -L /usr/bin/$app ] && /bin/rm -f /usr/bin/$app
  # Build slaves list
  [[ "$app" != java ]] && slaves="$slaves --slave /usr/bin/$app $app /usr/bin/gcj-$app-3.4.3"
done
update-alternatives --install /usr/bin/java java /usr/bin/gcj-java-3.4.3 20 $slaves

POSTUN

/bin/sh

if [ ! -f "/usr/bin/gcj-java-3.4.3" ]; then
  update-alternatives --remove java /usr/bin/gcj-java-3.4.3
fi