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:1772)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentToolTipChanged(WindowManagerImpl.java:1377)
   at org.openide.windows.TopComponent.setToolTipText(TopComponent.java:1068)
   at com.peter.mavenrunner.MavenRunnerTopComponent.<init>(MavenRunnerTopComponent.java:115)
   at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java:0)
   at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
   at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:488)
   at org.openide.loaders.InstanceSupport.instanceCreate(InstanceSupport.java:222)
   at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1442)
   at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:846)
   at org.openide.loaders.FolderLookup$ICItem.getInstance(FolderLookup.java:597)
   at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:1055)
   at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:1035)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.computeSingleResult(ProxyLookup.java:1285)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.computeDelegate(ProxyLookup.java:1123)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1090)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1073)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.toArray(ProxyLookup.java:1179)
   at java.util.ArrayList.addAll(ArrayList.java:599)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.computeDelegate(ProxyLookup.java:1143)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1090)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.delegate(ProxyLookup.java:1073)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.isEmpty(ProxyLookup.java:1163)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.computeDelegate(ProxyLookup.java:1134)
   at org.openide.util.lookup.ProxyLookup$LazyCollection.access$900(ProxyLookup.java:1051)
   at org.openide.util.lookup.ProxyLookup$LazyCollection$1.hasNext(ProxyLookup.java:1251)
   at org.netbeans.spi.project.support.DelegatingLookupImpl.doDelegate(DelegatingLookupImpl.java:134)
   at org.netbeans.spi.project.support.DelegatingLookupImpl.<init>(DelegatingLookupImpl.java:91)
   at org.netbeans.spi.project.support.LookupProviderSupport.createCompositeLookup(LookupProviderSupport.java:111)
   at org.netbeans.modules.maven.NbMavenProjectImpl.<init>(NbMavenProjectImpl.java:268)
   at org.netbeans.modules.maven.NbMavenProjectFactory.loadProject(NbMavenProjectFactory.java:118)
   at org.netbeans.modules.projectapi.nb.NbProjectManager.createProject(NbProjectManager.java:401)
   at org.netbeans.modules.projectapi.nb.NbProjectManager.access$300(NbProjectManager.java:94)
   at org.netbeans.modules.projectapi.nb.NbProjectManager$2.run(NbProjectManager.java:314)
   at org.netbeans.modules.projectapi.nb.NbProjectManager$2.run(NbProjectManager.java:243)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(DefaultMutexImplementation.java:209)
   at org.openide.util.Mutex.readAccess(Mutex.java:250)
   at org.netbeans.modules.projectapi.nb.NbProjectManager.findProject(NbProjectManager.java:243)
   at org.netbeans.api.project.ProjectManager.findProject(ProjectManager.java:167)
   at org.netbeans.modules.project.ui.OpenProjectList.URLs2Projects(OpenProjectList.java:1260)
   at org.netbeans.modules.project.ui.OpenProjectList.access$1400(OpenProjectList.java:137)
   at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.loadOnBackground(OpenProjectList.java:474)
   at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.run(OpenProjectList.java:394)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)