This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
1. Create a Java project 2. Close this project 3. Shut down the IDE 4. Delete nbproject/private in the project's directory 5. Delete <userdir>/build.properties 6. Restart the IDE 7. Open the project created in step 1 => The project will have broken references to libraries, as <userdir>/build.properties was not updated to point to the library locations within the IDE installation. I admit the steps to reproduce (in particular step 5) are somewhat artificial and awkward (hence P4 priority), but Arun Gupta is experiencing similar symptoms and may be able to provide some more realistic steps to reproduce, which would turn this into a higher priority problem.
The steps are very artificial and we probably don't want to fix it. If you delete the whole user dir (or at least the libraries timestamp file) this will not happen.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss