How to set jvm.dll path in Windows installation

[Rod Widdowson]

I thought that setting JAVA_HOME (as a system environment) and then restarting shibd_idp would do it, but that might be a one time
when you install.

This is waaay out of supported (so YMMV &c &c) but [1] is the place to go for help.

It looks as though

       shibd_idp //US --Jvm <whatever>

might do what you need.  

Even less supported: it's in the registry if you want to poke - note that it's under the WOW64 tree  for (I think)
HKLM\SOFTWARE\Apache. 

[1] https://commons.apache.org/proper/commons-daemon/procrun.html