I found this very useful stack overflow:

https://stackoverflow.com/a/36552613/857994

It shows you how to start a spring-boot JAR from a different main class.  It’s a quirky solution, but it worked great.  Here’s a slightly more obvious/cleaner copy of the command (mostly for my own future reference):

java -cp presto-ws-3.2.2.jar -Dloader.main=com.company.PrestoQueryRunner org.springframework.boot.loader.PropertiesLauncher