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This issue was reported manually by sajjadG. It already has 1 duplicates Build: NetBeans IDE Dev (Build 20171109-unknown-revn) VM: Java HotSpot(TM) 64-Bit Server VM, 9+181, Java(TM) SE Runtime Environment, 9+181 OS: Linux User Comments: sajjadG: I had open windows but after I closed them all I couldn't open new ones. I have installed some plugins related to c++ and databases from the plugin section. Stacktrace: java.lang.ClassNotFoundException: org.openide.windows.ModeSelector at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185) at java.lang.ClassLoader.loadClass(ClassLoader.java:496) at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:197) at java.lang.ClassLoader.loadClass(ClassLoader.java:496) at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1242)
Created attachment 165423 [details] stacktrace
did a new build and after running a dialog came and said plug-in versions are old or something and there was a button for disabling them. after disabling things are working just fine. it seems one of those plug-ins causing this exception.