As kind of another test, I've ported my largest NetBeans platform app from 8.2 to NetBeans 9 build 406. It's 60 modules plus 40 library wrapper modules, 5 suites, ant-based.
In case it is of interest, here are my steps and results: 1. Create a copy of all the sources, open in NetBeans 9 dev: After creating an additional library wrapper for jdesktop beansbinding (this has been discussed on this list before) and after removing (unselecting) all new in NetBeans 9 and unneeded in my application modules I could successfully compile it against jdk 1.8.0_162 and also successfully run it with jdk 1.8.0_162. (I've had no time to test all functionality of the app, but the basics work.) 2a. Compile the application against jdk 9: Simply switching the java platform to jdk 9 got me a lot of red error marks immediately, but i could compile it successfully. After a later restart of the ide the error marks disappeared. 2b. Run the application with jdk 9. Still causes a lot of trouble, but doesn't seem to be related to NetBeans 9. (My web services clients don't work with java 9 because the javax.xml.ws.* package is excluded by default. However, including it causes further trouble.) All in all, I havn't run across serious problems with the new platform itself. Boris -- Boris Heithecker