Error response from daemon: Dockerfile parse error line 1: unknown instruction: #

I just tested the same and by default VSCode seems to save the Dockerfile with UTF-16 LE encoding.

Resaving the file as UTF-8 allowed docker build to run without error.

I forgot to have a whitespace in ENTRYPOINT["java",

It should be ENTRYPOINT ["java",

Solved by removing the dockerfile and creating it with Notepad instead of Visual Code