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This bug was originally marked as duplicate of bug 247660, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 (Build 201510222201) VM: Java HotSpot(TM) 64-Bit Server VM, 25.101-b13, Java(TM) SE Runtime Environment, 1.8.0_101-b13 OS: Windows 10 User Comments: GUEST: I ran a project Stacktrace: java.lang.UnsupportedOperationException: command: run, JavaRunner impls: [] at org.netbeans.api.java.project.runner.JavaRunner.execute(JavaRunner.java:319) at org.netbeans.modules.java.api.common.project.BaseActionProvider.bypassAntBuildScript(BaseActionProvider.java:1867) at org.netbeans.modules.java.api.common.project.BaseActionProvider.access$1400(BaseActionProvider.java:156) at org.netbeans.modules.java.api.common.project.BaseActionProvider$1Action.doRun(BaseActionProvider.java:555) at org.netbeans.modules.java.api.common.project.BaseActionProvider$1Action.run(BaseActionProvider.java:458) at org.netbeans.api.java.source.ui.ScanDialog.runWhenScanFinished(ScanDialog.java:153)
Created attachment 162252 [details] stacktrace
Missing or broken netbeans/java/modules/org-netbeans-modules-java-source-ant.jar module which provides the JavaRunnerImplementation. Please try to delete user dir if it does not help reinstall NetBeans.