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Product Version: NetBeans IDE Dev (Build 201703160002) Java: 1.8.0_111; Java HotSpot(TM) 64-Bit Server VM 25.111-b09 Steps to reproduce: Create new Java project with existed sources Try to run it IDE prints exception in Output window: C:\Users\mkhramov\AppData\Local\NetBeans\Cache\dev\executor-snippets\run.xml:48: java.lang.IllegalArgumentException: Root cannot be null. at org.netbeans.modules.java.classpath.SimplePathResourceImplementation.verify(SimplePathResourceImplementation.java:85) at org.netbeans.modules.java.classpath.SimplePathResourceImplementation.verify(SimplePathResourceImplementation.java:68) at org.netbeans.api.java.queries.SourceForBinaryQuery.findSourceRoots2(SourceForBinaryQuery.java:122) at org.netbeans.modules.java.source.ant.TranslateClassPath.translateEntry(TranslateClassPath.java:145) at org.netbeans.modules.java.source.ant.TranslateClassPath.translate(TranslateClassPath.java:107) at org.netbeans.modules.java.source.ant.TranslateClassPath.execute(TranslateClassPath.java:96) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:435) at org.apache.tools.ant.Target.performTasks(Target.java:456) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405) at org.apache.tools.ant.Project.executeTarget(Project.java:1376) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1260) at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:286) at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:555) at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153) At least in Build 201703130002 this was works OK.
Should be fixed http://hg.netbeans.org/jet-main/rev/9fa8d4c2b48c