In Netbeans I can create a project using existing sources of Java files. If I want to add additional sources to a project how can I do so?
I had a similar problem where I added files directly to the project path from a file manager and NetBeans did not show them in my project tree.
I found a good solution for my needs using git. As it is good practice to use a repository for code tracking code changes and I will be doing it regardless. Anyway my resolution to the issue is:
Check the "Diff to HEAD" on the main project folder from within the NetBeans interface and the new files are now found...While your there double check your changes and commit.
You can attach a source JAR. You also can use the Import Sources module ("File -> Import Sources") to import source files from the file system.
NetBeans 8.0
You can copy complete packages including sub-packages to the projects /src/
-folder.
Then Source » Scan for External Changes
and the new sources will be added automatically.
Have fun.