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The vanilla NetBeans bundled equinox does not work with Verona JDK 9. In the java/jdk9 branch the problem is worked around by a binary patch to the bundled equinox but it should be resolved by an integration of a new equinox when available. I've submitted the source path to eclipse issue: https://bugs.eclipse.org/bugs/show_bug.cgi?id=478175. When the issue will be resolve a new equinox HAS TO be integrated to the NetBeans, which may be non trivial task according to https://netbeans.org/bugzilla/show_bug.cgi?id=240903#c7.
@Tomas: The eclipse issue has been solved. Now you can start with "new equinox HAS TO be integrated to the NetBeans"
The Equinox patch was already integrated, see: https://bugs.eclipse.org/bugs/show_bug.cgi?id=478175. The netbinox should be updated by a new equinox version.
Current version with binary patch works fine from NetBeans 9. Since the integration of new equinox non trivial task, I am changing this issue from defect to task.