OK, you guys stimulated me to look into it.
I think the only Mac-specific thing is Gatekeeper, which doesn't like you to open unsigned apps. You can green-light an app like launch.jnlp, but since it is downloaded new each time, that doesn't persist. But I managed to disable Gatekeeper so now it's just OK in a dialog.
Then there is an invalid certificate warning that requires some rigamarole. I can get rid of that by accessing IPMI via http instead of https. Is that what you guys do?
View attachment 15160
Then there is this warning. Do you guys get this?
View attachment 15161
So now it's down to 2 clicks. Much easier!
I've always had Gatekeeper turned off so I can't speak to that, but otherwise, yes, I get the java warning. I just click run and it comes up and works perfectly. Other than the extra clicks, I've had no problems.