You do not have a symbolic link, sepuku. Your ln operands were
backwards. The order is
source then
target, or
source then
directory.
You might try something like this (I've not tested this, but it may work), as it uses
source then
directory:
$ ln -s /usr/local/jdk-1.5.0/jre/plugin/i386/ns7/libjavaplugin_oji.so ~/.mozilla/plugins
Please review the
ln(1) man page.