How to modify Spring Boot bootRepackage jar file?

Question

I want to modify application.properties of a jar file after build a spring boot application. I had used jar xf to extract the jar file then modified the properties file but after jar-ed ( jar -0cf ), it had not been working with printout:

no main manifest attribute, in < filename >.jar

So is there anyway to do it and how?

Answer 1

Jar file is just an zip file. You can open it and add file using any of tools that manipulate zip files.

Or if you want to update using jar command line you can do it using this syntax.

jar uf jar-file input-file(s)

Like described here:

https://docs.oracle.com/javase/tutorial/deployment/jar/update.html