How to call a spring-boot java application from docker shell script (entrypoint)?

I have a Dockerfile that ends with:

ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

Now I want to run some initialisation from a shell script before that. So I have to refactor that to:

ENTRYPOINT[ /entrypoint.sh]

With:

!#/bin/bash
echo "some init"

#TODO
#ENTRYOINT["java", "org.springframework.boot.loader.JarLauncher"]

Question: how can I actually simulate the java entrypoint inside the shell script?

>Solution :

ShellScript can be edited to run normal Java file.

From docker documentation:

If you need to write a starter script for a single executable, you can ensure that the final executable receives the Unix signals by using exec

!#/bin/bash
echo "some init"

#Execute using linux 'exec' Java launcher
exec java org.springframework.boot.loader.JarLauncher