You have a 3rd party plugin com.peter.mavenrunner.MavenRunnerTopComponent that's calling a NetBeans API outside the AWT thread.
NetBeans is just warning you about that. Generally it's not causing something but once in a blue-moon such calls will cause unexpected states and bugs will show up. I recommend you notify the plugin author too. My guess is the plugin is this: http://plugins.netbeans.org/plugin/60381/maven-runner so you can add an issue here https://gitlab.com/mcheung63/MavenRunner/issues --emi ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On 13 June 2018 2:46 PM, Mike Billman <mikebill...@qcsoftware.com> wrote: > I have gotten this exception two days in a row when starting NB 9. Seems to > not have any impact on the IDE, but strange. > > > > java.lang.IllegalStateException: Problem in some module which uses Window > System: Window System API is required to be called from AWT thread only, see > http://core.netbeans.org/proposals/threading/ > > at > org.netbeans.core.windows.WindowManagerImpl.warnIfNotInEDT(WindowManagerImpl.java:1747) > > at > org.netbeans.core.windows.WindowManagerImpl.topComponentToolTipChanged(WindowManagerImpl.java:1352) > > at > org.openide.windows.TopComponent.setToolTipText(TopComponent.java:1043) > > at > com.peter.mavenrunner.MavenRunnerTopComponent.<init>(MavenRunnerTopComponent.java:115) > > at > sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) > > at > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) > > at > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) > > at > java.lang.reflect.Constructor.newInstance(Constructor.java:423) > > at > org.openide.loaders.InstanceSupport.instanceCreate(InstanceSupport.java:197) > > at > org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1417) > > at > org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:821) > > at > org.openide.loaders.FolderLookup$ICItem.getInstance(FolderLookup.java:572) > > at > org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:1030) > > at > org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:1010) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.computeSingleResult(ProxyLookup.java:1260) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.computeDelegate(ProxyLookup.java:1098) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1065) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1048) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.toArray(ProxyLookup.java:1154) > > at java.util.ArrayList.addAll(ArrayList.java:581) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.computeDelegate(ProxyLookup.java:1118) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1065) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1048) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.isEmpty(ProxyLookup.java:1138) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.computeDelegate(ProxyLookup.java:1109) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection.access$900(ProxyLookup.java:1026) > > at > org.openide.util.lookup.ProxyLookup$LazyCollection$1.hasNext(ProxyLookup.java:1226) > > at > org.netbeans.spi.project.support.DelegatingLookupImpl.doDelegate(DelegatingLookupImpl.java:115) > > at > org.netbeans.spi.project.support.DelegatingLookupImpl.<init>(DelegatingLookupImpl.java:72) > > at > org.netbeans.spi.project.support.LookupProviderSupport.createCompositeLookup(LookupProviderSupport.java:86) > > at > org.netbeans.modules.maven.NbMavenProjectImpl.<init>(NbMavenProjectImpl.java:245) > > at > org.netbeans.modules.maven.NbMavenProjectFactory.loadProject(NbMavenProjectFactory.java:95) > > at > org.netbeans.modules.projectapi.nb.NbProjectManager.createProject(NbProjectManager.java:376) > > at > org.netbeans.modules.projectapi.nb.NbProjectManager.access$300(NbProjectManager.java:69) > > at > org.netbeans.modules.projectapi.nb.NbProjectManager$2.run(NbProjectManager.java:289) > > at > org.netbeans.modules.projectapi.nb.NbProjectManager$2.run(NbProjectManager.java:218) > > at > org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(DefaultMutexImplementation.java:188) > > at org.openide.util.Mutex.readAccess(Mutex.java:225) > > at > org.netbeans.modules.projectapi.nb.NbProjectManager.findProject(NbProjectManager.java:218) > > at > org.netbeans.api.project.ProjectManager.findProject(ProjectManager.java:142) > > at > org.netbeans.modules.projectapi.SimpleFileOwnerQueryImplementation.getOwner(SimpleFileOwnerQueryImplementation.java:136) > > at > org.netbeans.modules.projectapi.SimpleFileOwnerQueryImplementation.getOwner(SimpleFileOwnerQueryImplementation.java:88) > > at > org.netbeans.api.project.FileOwnerQuery.getOwner(FileOwnerQuery.java:125) > > at > org.netbeans.modules.projectapi.ProjectSharabilityQuery2.getSharability(ProjectSharabilityQuery2.java:40) > > at > org.netbeans.api.queries.SharabilityQuery.getSharability(SharabilityQuery.java:152) > > at > org.netbeans.modules.subversion.Subversion.isIgnored(Subversion.java:401) > > at > org.netbeans.modules.subversion.FileStatusCache.createMissingEntryFileInformation(FileStatusCache.java:1109) > > at > org.netbeans.modules.subversion.FileStatusCache.createFileInformation(FileStatusCache.java:927) > > at > org.netbeans.modules.subversion.FileStatusCache.refresh(FileStatusCache.java:567) > > at > org.netbeans.modules.subversion.FileStatusCache.refresh(FileStatusCache.java:476) > > at > org.netbeans.modules.subversion.FileStatusCache.cleanUp(FileStatusCache.java:773) > > at > org.netbeans.modules.subversion.Subversion$2.run(Subversion.java:155) > > at > org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) > > at > org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45) > > at > org.openide.util.lookup.Lookups.executeWith(Lookups.java:278) > > at > org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033) > > > > Mike Billman > > Senior Software Engineer > > CPTE > > > > > > 11800 Conrey Rd > > Suite 150 > > Cincinnati, OH 45249 > > > > T +1 513 469 1424 > > E mikebill...@qcsoftware.com > > F +1 513 469 1425 > > --------------------------------------------------------------------- To unsubscribe, e-mail: 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