java.lang.IllegalStateException: Cannot call start twice on a handle
   at org.netbeans.modules.progress.spi.InternalHandle.start(InternalHandle.java:209)
   at org.netbeans.api.progress.ProgressHandle.start(ProgressHandle.java:97)
   at org.netbeans.api.progress.ProgressHandle.start(ProgressHandle.java:85)
   at org.netbeans.modules.maven.indexer.RemoteIndexTransferListener.transferStarted(RemoteIndexTransferListener.java:99)
   at org.apache.maven.wagon.events.TransferEventSupport.fireTransferStarted(TransferEventSupport.java:106)
   at org.apache.maven.wagon.AbstractWagon.fireGetStarted(AbstractWagon.java:533)
   at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:295)
   at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:276)
   at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:97)
   at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
   at org.sonatype.nexus.index.updater.DefaultIndexUpdater$WagonFetcher.retrieve(DefaultIndexUpdater.java:675)
   at org.sonatype.nexus.index.updater.AbstractResourceFetcher.retrieve(AbstractResourceFetcher.java:22)
   at org.sonatype.nexus.index.updater.DefaultIndexUpdater.loadIndexDirectory(DefaultIndexUpdater.java:246)
   at org.sonatype.nexus.index.updater.DefaultIndexUpdater.access$300(DefaultIndexUpdater.java:74)
   at org.sonatype.nexus.index.updater.DefaultIndexUpdater$LuceneIndexAdaptor.setIndexFile(DefaultIndexUpdater.java:815)
   at org.sonatype.nexus.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:1010)
   at org.sonatype.nexus.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:159)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.indexLoadedRepo(NexusRepositoryIndexerImpl.java:403)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.loadIndexingContext(NexusRepositoryIndexerImpl.java:298)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.access$300(NexusRepositoryIndexerImpl.java:145)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$6.run(NexusRepositoryIndexerImpl.java:696)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$6.run(NexusRepositoryIndexerImpl.java:691)
   at org.openide.util.Mutex.writeAccess(Mutex.java:436)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.getRecords(NexusRepositoryIndexerImpl.java:691)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.getRecords(RepositoryQueries.java:117)
   at org.netbeans.modules.maven.repository.ui.BasicArtifactPanel$4.run(BasicArtifactPanel.java:540)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1426)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Cannot call start twice on a handle
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:421)
   at org.netbeans.modules.maven.repository.ui.BasicArtifactPanel.componentOpened(BasicArtifactPanel.java:538)
   at org.netbeans.core.multiview.MultiViewPeer.showCurrentElement(MultiViewPeer.java:289)
   at org.netbeans.core.multiview.MultiViewPeer.peerComponentOpened(MultiViewPeer.java:237)
   at org.netbeans.core.multiview.MultiViewTopComponent.componentOpened(MultiViewTopComponent.java:138)
   at org.openide.windows.WindowManager.componentOpenNotify(WindowManager.java:303)
   at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentOpened(WindowManagerImpl.java:975)
   at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:774)
   at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:314)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1083)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentOpen(WindowManagerImpl.java:1050)
   at org.openide.windows.TopComponent.open(TopComponent.java:491)
   at org.openide.windows.TopComponent.open(TopComponent.java:471)
   at org.netbeans.modules.maven.indexer.api.ui.ArtifactViewer.showArtifactViewer(ArtifactViewer.java:129)
   at org.netbeans.modules.maven.indexer.api.ui.ArtifactViewer.showArtifactViewer(ArtifactViewer.java:95)
   at org.netbeans.modules.maven.api.CommonArtifactActions$ShowArtifactAction.actionPerformed(CommonArtifactActions.java:158)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223)
   at javax.swing.plaf.basic.BasicPopupMenuUI$Actions.doReturn(BasicPopupMenuUI.java:429)
   at javax.swing.plaf.basic.BasicPopupMenuUI$Actions.actionPerformed(BasicPopupMenuUI.java:403)
   at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1633)
   at javax.swing.JComponent.processKeyBinding(JComponent.java:2851)
   at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:267)
   at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:216)
   at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2928)
   at javax.swing.JComponent.processKeyBindings(JComponent.java:2920)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2814)
   at java.awt.Component.processEvent(Component.java:6044)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1850)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:712)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:990)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676)
   at java.awt.Component.dispatchEventImpl(Component.java:4502)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)