Update: Dockerfile.java

[harshal-rembhotkar]

Description:

Currently, the Dockerfile includes Java support, but the project does not yet have a .jar file. This causes build failures when attempting to copy a non-existent file.

Proposed Solution:

Modify the Dockerfile to ensure it only runs the Java application if a .jar file is present.

Expected Outcome:

The build should not fail due to a missing .jar file.
Future Java support can be added without breaking the Docker image

[pradeeban]

Thanks, merged.