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(NativeConstructorAccessorImpl.java:0)
   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.project.ui.OpenProjectList.URLs2Projects(OpenProjectList.java:1235)
   at org.netbeans.modules.project.ui.OpenProjectList.access$1400(OpenProjectList.java:112)
   at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.loadOnBackground(OpenProjectList.java:449)
   at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.run(OpenProjectList.java:369)
   at org.openide.util.RequestProcessor$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)