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java.lang.NullPointerException at javax.swing.DefaultRowSorter.getViewToModelAsInts(DefaultRowSorter.java:742) at javax.swing.DefaultRowSorter.sort(DefaultRowSorter.java:572) at javax.swing.DefaultRowSorter.shouldOptimizeChange(DefaultRowSorter.java:1025) at javax.swing.DefaultRowSorter.rowsInserted(DefaultRowSorter.java:867) at javax.swing.JTable.notifySorter(JTable.java:4270) at javax.swing.JTable.sortedTableChanged(JTable.java:4118) at javax.swing.JTable.tableChanged(JTable.java:4395) at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:296) at javax.swing.table.AbstractTableModel.fireTableRowsInserted(AbstractTableModel.java:231) at GoodsView$GoodsViewTableModel.addPositions(Main.java:215) at GoodsView$2.process(Main.java:113) at javax.swing.SwingWorker$3.run(SwingWorker.java:414) at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112) at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:832) at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112) at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:842) at javax.swing.Timer.fireActionPerformed(Timer.java:313) at javax.swing.Timer$DoPostEvent.run(Timer.java:245) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)