Ошибка экспорта в excel

DefaultTableModel model = (DefaultTableModel) Form.TableDB.getModel();
            WritableWorkbook workbook;
            try {
                File file = new File ("c:\\output.xls");
                workbook = Workbook.createWorkbook(file);
                WritableSheet sheet = workbook.createSheet("Актион", 0);
                int i,j;
                for (i=0;i<model.getColumnCount();i++)
                {
                Label label = new Label(i,0, model.getColumnName(i));
                sheet.addCell(label);
                }

                for (i=0;i<model.getRowCount();i++)
                {
                     for (j=0;j<model.getColumnCount();j++)
                     {
                         Label label = new Label(j,i+1, (String) model.getValueAt(i,j));
                         sheet.addCell(label);
                     }
                }
                workbook.write();
                workbook.close();
                Process process = Runtime.getRuntime().exec("cmd /c \"C:\\Program Files\\Microsoft Office\\OFFICE11\\excel.exe\" " + file);
                process.waitFor();
                file.delete();
            } catch (IOException e1) {
                e1.printStackTrace();
            } catch (RowsExceededException e1) {
                e1.printStackTrace();
            } catch (WriteException e1) {
                e1.printStackTrace();
            } catch (InterruptedException e1) {
                e1.printStackTrace();
            }

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
        at jxl.write.biff.File.write(File.java:135)
        at jxl.write.biff.RowRecord.writeCells(RowRecord.java:323)
        at jxl.write.biff.SheetWriter.write(SheetWriter.java:479)
        at jxl.write.biff.WritableSheetImpl.write(WritableSheetImpl.java:1425)
        at jxl.write.biff.WritableWorkbookImpl.write(WritableWorkbookImpl.java:896)
        at Aktion$expExcel.actionPerformed(Aktion.java:80)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)