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Use Cloud Shell to build and test applications for development purpose.
You can run and test a an application directly within Cloud Shell. Cloud Shell has many tools pre-installed, such OpenJDK, Maven, Gradle, and more. Cloud Shell is meant for development and not meant for production or long running processes.
git clone https://github.com/saturnism/jvm-helloworld-by-example
java -jar target/helloworld.jar
From Cloud Shell, click Web Preview, then click Preview on port 8080.