With excellent help from the ATO sorting out java, finally got it
working and am now happily(?) dealing through the Business Portal.
If going this route, there are other posts detailing the necessity to
remove OpenJDK, Icedtea etc, installing the latest FireFox and latest
java (in this case 1.7.0_13) and making sure it works by testing it
(
http://www.java.com/en/download/testjava.jsp) before proceeding.
1. Prerequisites: UnlimitedJCEPolicyJDK7.zip downloaded from
http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
Extract and copy files (not the folder itself) from the extracted
folder to /usr/lib/jvm/java-7-oracle/jre/lib/security/
2. From the ATO, download and install AUSkey software. To do this, in
general, read and follow the included readme file, although the example
given is confusing (to me) in places and wrong (according to the ATO) in
others. Hopefully they will correct it.
3. Java cache. This gotcha caused me grief for a month. If, for
whatever reason, the AUSkey applet doesn't load, then java caches the
error and will, from then on, load the error. To overcome that,
you need to clear the java cache: from the command line type
"jcontrol" (without the quotes), then in the 'General' tab of the Java
Control Panel under 'Temporary Internet Files' choose 'Settings' click
'Delete Files', 'OK' uncheck the 'Keep temporary files on my computer',
click 'OK', then 'OK' on the Java Control Panel, restart FireFox and I,
at least, was good to go.