The easiest way to Port a Java application to OSv is using Capstan.

You can use the following example as a starting point.

• Build JVM & CLI image first

  make image=java,cli
  

• Run OSv instance

  ./scripts/run.py -n
  

• Upload new .jar file

  curl -X POST http://192.168.122.89:8000/file/js.jar -Fname=@js.jar
  

• Run the application

  curl -X PUT http://192.168.122.89:8000/app?command=java.so%20-jar%20js.jar
  

Alternatively, you can change the image cmdline and reboot:

• Change cmdline to run .jar file

  curl -X POST -d cmdline="java.so -jar js.jar" \
  http://192.168.122.89:8000/os/cmdline
  

• Reboot OSv instance

  curl -X POST http://192.168.122.89:8000/os/reboot
  

In case your Java application goes outside the JVM and uses system calls, it might fail on a missing symbol or a system call. We will publish a short guide on how to solve these issues soon.