will not scan maven reactor

[Ed42]

I am in my project root directory (a Java 17 maven reactor).

I'm running this

java --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED -jar spring-boot-upgrade.jar .

but all i get as output is this:

Caused by: org.springframework.sbm.build.api.RootBuildFileNotFoundException: Could not find BuildFile for root module.
	at org.springframework.sbm.build.api.RootBuildFileFilter.lambda$apply$2(RootBuildFileFilter.java:29)
...