After a bunch of reinstalling of JDK code and messing with environment, the sprint tools suite is back to a working state on my small home development machine.
I’m not sure what fixed the problem but it was a rather strange one. Eclipse and IntelliJ were working normally and the java command line looked good. For some reason the STS IDE wouldn’t find some JDK pieces it expected. I have STS running on three other machines here at home without problems (and with pretty much identical installs).
Glad to have that dealt with though I wish I understood why it was broken and what actually fixed the problem.