I installed jRebel on Netbeans 7.4 beta one day, the next day all my source folders an libraries to disappeared from my projects - except Maven ones. Like this:
The source folders are still present on my drive:
I just need to restore their visibility in my opened Netbeans projects.
When I try to add source packages from the "Properties" menu of the project, I do get the source back but as folders, not packages.
Help would be much appreciated!
The question is answered at JRebel Forum. The culprit is unknown.
Try going to Files view in Neteans, and look under the src folder in your project. Does the src folder have a sub-folder named java?
If not, create it (right click on src, go to New, select Folder). Your source packages should re-appear in the project view.
This is for Netbeans 8.0. I am not sure if it is available for other versions.
Right click on the project -> Set Configuration -> Customize -> Sources -> Add Folder for Sources Packages Folder -> Select folders you want to see under your project -> OK
Netbeans version 8:
In files tab, go to main folder and create a folder called java. That's it!
来源：https://stackoverflow.com/questions/18869423/source-folders-not-visible-in-netbeans-project-after-installing-jrebel-plugin