java.lang.OutOfMemoryError: Java heap space
        at com.sun.java.swing.plaf.gtk.GTKNativeEngine.finishPainting(GTKNativeEngine.java:493)
        at com.sun.java.swing.plaf.gtk.GTKPainter.paintTreeCellBackground(GTKPainter.java:1060)
        at javax.swing.plaf.synth.SynthTreeUI.paintRow(SynthTreeUI.java:557)
        at javax.swing.plaf.synth.SynthTreeUI.paint(SynthTreeUI.java:299)
        at javax.swing.plaf.synth.SynthTreeUI.update(SynthTreeUI.java:226)
        at javax.swing.JComponent.paintComponent(JComponent.java:763)
        at javax.swing.JComponent.paint(JComponent.java:1027)
        at org.openide.explorer.view.TreeView$ExplorerTree.access$1201(TreeView.java:1552)
        at org.openide.explorer.view.TreeView$ExplorerTree.guardedPaint(TreeView.java:1741)
        at org.openide.explorer.view.TreeView$ExplorerTree.access$1600(TreeView.java:1552)
        at org.openide.explorer.view.TreeView$ExplorerTree$GuardedActions.run(TreeView.java:2079)
        at org.openide.util.Mutex.readAccess(Mutex.java:285)
        at org.openide.explorer.view.TreeView$ExplorerTree$GuardedActions.<init>(TreeView.java:2072)
        at org.openide.explorer.view.TreeView$ExplorerTree.paint(TreeView.java:1676)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JViewport.paint(JViewport.java:747)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)
        at org.netbeans.swing.tabcontrol.TabbedContainer.paint(TabbedContainer.java:968)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1036)