Use Jaguar or Panther install disks for system OS.
sudo mkdir /var/spool/uucp
sudo chmod 775 /var/spool/uucp
sudo niutil -appendprop / /groups/uucp users [user_name](replace with user "Short Name" from the "Accounts Preference Panel." Do this for every user account.)
/Applications/ImageJ1.30/ImageJ.app/Contents/Resources/MRJApp.propertieswith a text editor. Replace the line
com.apple.mrj.application.classpath=Contents/Resources/Java/ij.jarwith this one
com.apple.mrj.application.classpath=Contents/Resources/Java/ij.jar:/Library/Java/ExtensionsSave and close the file. In newer versions this file is /Applications/ImageJ1.30/ImageJ.app/Contents/info.plist and the CLASSPATH line should be modified from
$JAVAROOT/ij.jarto
$JAVAROOT/ij.jar:/System/Library/Java/Extensions/QTJava.zip:/Library/Java/Extensions/and the JMVersion set to 1.3+.