Java Netbeans: upgrade binary Netbeans 29 to Netbeans 30

 This step is straight forward:

1. go to your root directory (e.g your home dir ~/), and rename old folder e.g ~/netbeans29.
2. extract netbeans 30 binary and put it in root directory to replace old folder (e.g your home dir ~/).
3. Run your netbeans 30, import previous configuration
4. if no error found you safe to remove
1. old netbeans 29 (e.g ~/netbeans29) 
2. ~/.netbeans/29
3. ~/.cache/netbeans/29