java.lang.ArrayIndexOutOfBoundsException: 9 > 0
        at java.util.Vector.insertElementAt(Vector.java:551)
        at javax.swing.tree.DefaultMutableTreeNode.insert(DefaultMutableTreeNode.java:177)
        at javax.swing.tree.VariableHeightLayoutCache.createNodeAt(VariableHeightLayoutCache.java:763)
        at javax.swing.tree.VariableHeightLayoutCache.treeNodesInserted(VariableHeightLayoutCache.java:473)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.treeNodesInserted(BasicTreeUI.java:3790)
        at javax.swing.tree.DefaultTreeModel.fireTreeNodesInserted(DefaultTreeModel.java:499)
        at javax.swing.tree.DefaultTreeModel.nodesWereInserted(DefaultTreeModel.java:296)
        at javax.swing.tree.DefaultTreeModel.insertNodeInto(DefaultTreeModel.java:223)
        at org.netbeans.swing.dirchooser.DirectoryChooserUI$TreeExpansionHandler.refreshNode(DirectoryChooserUI.java:2256)
        at org.netbeans.swing.dirchooser.DirectoryChooserUI$TreeExpansionHandler.treeExpanded(DirectoryChooserUI.java:2204)
        at javax.swing.JTree.fireTreeExpanded(JTree.java:2669)
        at javax.swing.JTree.setExpandedState(JTree.java:3430)
        at javax.swing.JTree.expandPath(JTree.java:2166)
        at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2209)
        at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2196)
        at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2154)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3508)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3456)
        at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)
        at java.awt.Component.processMouseEvent(Component.java:6038)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at org.netbeans.swing.dirchooser.DirectoryChooserUI$.processMouseEvent(DirectoryChooserUI.java:676)
        at java.awt.Component.processEvent(Component.java:5806)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3983)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
        at java.awt.Dialog$.run(Dialog.java:1045)
        at java.awt.Dialog$.run(Dialog.java:1097)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.awt.Dialog.show(Dialog.java:1095)
        at javax.swing.JFileChooser.showDialog(JFileChooser.java:723)
        at javax.swing.JFileChooser.showOpenDialog(JFileChooser.java:626)
        at org.netbeans.modules.java.jseproject.ui.customizer.JSESourceRootsUi$EditMediator.actionPerformed(JSESourceRootsUi.java:265)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.Component.processMouseEvent(Component.java:6041)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5806)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3986)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)