It'll do something, eventually, if I can get it working
mvn spring-boot:run
see docs
which say... Download opentelemetry-javaagent.jar from Releases of the opentelemetry-java-instrumentation repo. The JAR file contains the agent and all automatic instrumentation packages.
mvn package
export JAVA_TOOL_OPTIONS=-javaagent:./opentelemetry-javaagent.jar
java -jar target/whataservice-0.0.1-SNAPSHOT.jar
this will try to send to a local collector.