If you haven't installed native-image yet.
sdk install java 19.2.0-grl
sdk use java 19.2.0-grl
gu install native-image
./mvnw clean package -Pgraal -DskipTests=true
./target/classes/demo-boot-graal
Sep 06, 2019 3:37:48 PM com.fasterxml.jackson.databind.ext.Java7Support <clinit>
WARNING: Unable to load JDK7 types (annotations, java.nio.file.Path): no Java7 support added
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot ::
Sep 06, 2019 3:37:48 PM org.springframework.boot.StartupInfoLogger logStarting
INFO: Starting DemoBootGraalApplication on makinoMacBook-puro.local with PID 70668 (/Users/maki/git/demo-boot-graal/target/classes/demo-boot-graal started by maki in /Users/maki/git/demo-boot-graal)
Sep 06, 2019 3:37:48 PM org.springframework.boot.SpringApplication logStartupProfileInfo
INFO: No active profile set, falling back to default profiles: default
Sep 06, 2019 3:37:48 PM org.springframework.boot.web.embedded.netty.NettyWebServer start
INFO: Netty started on port(s): 8080
Sep 06, 2019 3:37:48 PM org.springframework.boot.StartupInfoLogger logStarted
INFO: Started DemoBootGraalApplication in 0.062 seconds (JVM running for 0.065)