In my personal experience, everything revolves about the need for a
functioning java plugin. If the Chrome does not have a java plugin or
the java plugin does not work, you are out of luck.
This may involve the user having to install and try out different java
versions from different providers. I've had no luck with OpenJDK and
always install the latest Java6 from Sun/Oracle. I have had trouble
with Java7 as well. Your mileage may vary. The 64-bit/32-bit
confusion does not help either - i.e. on a 64-bit operating system,
with a 32-bit chrome, you may have to install a 32-bit java / java
plugin. That one took me some trial and error on my girl friends
windows computer. I don't have access to a Mac that can run Chrome so
I can't tell you anything specific there.
I've seen reports where users also needed command line switches for
chrome to make it work. I have never needed to do that but again your
mileage may vary.
I've tried to help one Mac user where the issue seemed to be that his
Java Plugin could not execute signed Jar files.
Personally I've migrated away from Mac a couple of years ago when
Apple stopped supplying current JDKs. I code Java for a living, a
computer without a current JDK is useless to me. I have no personal
experience what the Java/Mac situation is right now but it does not
seem to have improved
Kind regards,
Juergen