Compiling the Application:
javac HelloWorld.java
Creating a jar:
jar cmvf META-INF/MANIFEST.MF HelloWorld.jar *.class
Launching the application:
java -Dhelloworld.port=8000 -jar HelloWorld.jar
The jar can be downloaded there:
https://storage.sbg-1.runabove.io/v1/AUTH_07c794077c014229b50290a459e8274b/public/HelloWorld.jar