If you are working on a projects in spring boot that has it's own packages custom built and if you make changes
to those files, folder how to use start using that one?
if you make changes on your packages(modules) java packages like common, every java projects larger ones have have there own custom version of packages like common, it generatlly includes common classes, auth method.
If your are working on sometype of featues which need changes in that you should make the changes in that then move to your terminal and root dir of your project.
#~/projects/common
/.gradlew build -x test // for testing the changes made.
/.gradlew build install
these should reconfig the .class version of your module and it is ready to be used.