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https://issues.apache.org/jira/browse/NETBEANS-4552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17170158#comment-17170158
 ] 

Neil C Smith commented on NETBEANS-4552:
----------------------------------------

Do you have nb-javac installed? Is Compile on Save enabled? Compile on Save 
requires nb-javac, rather than the JDK's javac, but there isn't currently a 
Java 14 capable nb-javac. This should be available in 12.1-beta2 this week.

> java.lang.UnsupportedOperationException command: run
> ----------------------------------------------------
>
>                 Key: NETBEANS-4552
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-4552
>             Project: NetBeans
>          Issue Type: Bug
>    Affects Versions: 12.0
>         Environment: Windows 7 Pro SP1
> OpenJDK 14 
>            Reporter: sun java
>            Priority: Blocker
>
> hello
> when trying to run my modular project project i get this exception.(note: I 
> can run the application outside IDE)
> {color:#172b4d}*java.lang.UnsupportedOperationException: command: run, 
> JavaRunner impls: 
> [org.netbeans.modules.java.source.ant.ProjectRunnerImpl@52e7ee7c]java.lang.UnsupportedOperationException:
>  command: run, JavaRunner impls: 
> [org.netbeans.modules.java.source.ant.ProjectRunnerImpl@52e7ee7c] at 
> org.netbeans.api.java.project.runner.JavaRunner.execute(JavaRunner.java:303) 
> at 
> org.netbeans.modules.java.api.common.project.ActionProviderSupport.bypassAntBuildScript(ActionProviderSupport.java:583)
>  at 
> org.netbeans.modules.java.api.common.project.JavaActionProvider$9.performCompileOnSave(JavaActionProvider.java:1591)
>  at 
> org.netbeans.modules.java.api.common.project.ActionProviderSupport$JavaModelWork.execute(ActionProviderSupport.java:1310)
>  at 
> org.netbeans.modules.java.api.common.project.ActionProviderSupport$JavaModelWork.run(ActionProviderSupport.java:1287)
>  at 
> org.netbeans.api.java.source.ui.ScanDialog.runWhenScanFinished(ScanDialog.java:133)
>  at 
> org.netbeans.modules.java.api.common.project.ActionProviderSupport.invokeTarget(ActionProviderSupport.java:202)
>  at 
> org.netbeans.modules.java.api.common.project.JavaActionProvider$ScriptAction.invoke(JavaActionProvider.java:465)
>  at 
> org.netbeans.modules.java.api.common.project.JavaActionProvider.lambda$invokeAction$1(JavaActionProvider.java:895)
>  at java.base/java.util.Optional.ifPresent(Optional.java:176) at 
> org.netbeans.modules.java.api.common.project.JavaActionProvider.invokeAction(JavaActionProvider.java:888)
>  at 
> org.netbeans.spi.project.support.LookupProviderSupport$MergedActionProvider.invokeAction(LookupProviderSupport.java:262)
>  at 
> org.netbeans.modules.project.ui.actions.ProjectAction$2.run(ProjectAction.java:162)
>  at 
> org.netbeans.modules.openide.util.NbMutexEventProvider$Event.doEvent(NbMutexEventProvider.java:95)
>  at 
> org.netbeans.modules.openide.util.NbMutexEventProvider$Event.writeAccess(NbMutexEventProvider.java:60)
>  at 
> org.netbeans.modules.openide.util.LazyMutexImplementation.writeAccess(LazyMutexImplementation.java:56)
>  at org.openide.util.Mutex.writeAccess(Mutex.java:285) at 
> org.netbeans.modules.project.ui.actions.ProjectAction.runSequentially(ProjectAction.java:159)
>  at 
> org.netbeans.modules.project.ui.actions.MainProjectAction$1$1.run(MainProjectAction.java:115)
>  at 
> java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:316)
>  at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770) 
> at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at 
> java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at 
> java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
>  at 
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
>  at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740) at 
> org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)[catch]
>  at 
> java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
>  at 
> java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
>  at 
> java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
>  at 
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
>  at 
> java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
>  at 
> java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)*{color}



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