java.lang.NullPointerException
   at java.awt.datatransfer.SystemFlavorMap.getAllNativesForType(SystemFlavorMap.java:1327)
   at java.awt.datatransfer.SystemFlavorMap.getNativesForFlavor(SystemFlavorMap.java:702)
   at sun.awt.datatransfer.DataTransferer.getFormatsForFlavors(DataTransferer.java:721)
   at sun.awt.windows.WDataTransferer.getFormatsForFlavors(WDataTransferer.java:177)
   at sun.awt.datatransfer.DataTransferer.getFormatsForTransferable(DataTransferer.java:659)
   at sun.awt.windows.WClipboard.setContentsNative(WClipboard.java:75)
   at sun.awt.datatransfer.SunClipboard.setContents(SunClipboard.java:110)
   at org.netbeans.NbClipboard$SetContents.run(NbClipboard.java:462)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)