Program: 22983
Project: 22983
Buggy source:
public void dump() throws IOException {
  for (int i=0; i < 34; i++) {
    sheet.autoSizeColumn(i);
  }
  sheet.setColumnHidden(2,true);
  sheet.setColumnHidden(3,true);
  sheet.setColumnHidden(30,true);
  sheet.setColumnHidden(31,true);
  sheet.setColumnHidden(32,true);
  sheet.setColumnWidth(9,columnPixels(20));
  sheet.setColumnWidth(11,columnPixels(100));
  sheet.setColumnWidth(12,columnPixels(100));
  sheet.setColumnWidth(13,columnPixels(100));
  sheet.setColumnWidth(15,columnPixels(20));
  sheet.setColumnWidth(16,columnPixels(20));
  sheet.setColumnWidth(17,columnPixels(20));
  sheet.setColumnWidth(18,columnPixels(20));
  sheet.setColumnWidth(34,columnPixels(100));
  int i=titles.length - 1;
  for (  StructureDefinitionMappingComponent map : def.getMapping()) {
    i++;
    sheet.setColumnWidth(i,columnPixels(50));
    sheet.autoSizeColumn(i);
  }
  sheet.createFreezePane(2,1);
  SheetConditionalFormatting sheetCF=sheet.getSheetConditionalFormatting();
  String address="String_Node_Str" + Integer.valueOf(sheet.getLastRowNum());
  CellRangeAddress[] regions={CellRangeAddress.valueOf(address)};
  ConditionalFormattingRule rule1=sheetCF.createConditionalFormattingRule("String_Node_Str");
  PatternFormatting fill1=rule1.createPatternFormatting();
  fill1.setFillBackgroundColor(IndexedColors.GREY_25_PERCENT.index);
  fill1.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
  ConditionalFormattingRule rule2=sheetCF.createConditionalFormattingRule("String_Node_Str");
  FontFormatting font=rule2.createFontFormatting();
  font.setFontColorIndex(IndexedColors.GREY_25_PERCENT.index);
  font.setFontStyle(true,false);
  sheetCF.addConditionalFormatting(regions,rule1,rule2);
  sheet.setAutoFilter(new CellRangeAddress(0,sheet.getLastRowNum(),0,titles.length + def.getMapping().size() - 1));
  XSSFSheet xSheet=(XSSFSheet)sheet;
  CTAutoFilter sheetFilter=xSheet.getCTWorksheet().getAutoFilter();
  CTFilterColumn filterColumn1=sheetFilter.addNewFilterColumn();
  filterColumn1.setColId(6);
  CTCustomFilters filters=filterColumn1.addNewCustomFilters();
  CTCustomFilter filter1=filters.addNewCustomFilter();
  filter1.setOperator(STFilterOperator.NOT_EQUAL);
  filter1.setVal("String_Node_Str");
  CTFilterColumn filterColumn2=sheetFilter.addNewFilterColumn();
  filterColumn2.setColId(26);
  CTFilters filters2=filterColumn2.addNewFilters();
  filters2.setBlank(true);
  for (  Row row : sheet) {
    if (row.getRowNum() > 0 && (!row.getCell(6).getStringCellValue().equals("String_Node_Str") || !row.getCell(26).getStringCellValue().isEmpty())) {
      ((XSSFRow)row).getCTRow().setHidden(true);
    }
  }
  sheet.setActiveCell(new CellAddress(sheet.getRow(1).getCell(0)));
  wb.write(outStream);
  flush();
  close();
}

Fixed version (ground truth):
public void dump() throws IOException {
  for (int i=0; i < 34; i++) {
    sheet.autoSizeColumn(i);
  }
  sheet.setColumnHidden(2,true);
  sheet.setColumnHidden(3,true);
  sheet.setColumnHidden(30,true);
  sheet.setColumnHidden(31,true);
  sheet.setColumnHidden(32,true);
  sheet.setColumnWidth(9,columnPixels(20));
  sheet.setColumnWidth(11,columnPixels(100));
  sheet.setColumnWidth(12,columnPixels(100));
  sheet.setColumnWidth(13,columnPixels(100));
  sheet.setColumnWidth(15,columnPixels(20));
  sheet.setColumnWidth(16,columnPixels(20));
  sheet.setColumnWidth(17,columnPixels(20));
  sheet.setColumnWidth(18,columnPixels(20));
  sheet.setColumnWidth(34,columnPixels(100));
  int i=titles.length - 1;
  for (  StructureDefinitionMappingComponent map : def.getMapping()) {
    i++;
    sheet.setColumnWidth(i,columnPixels(50));
    sheet.autoSizeColumn(i);
  }
  sheet.createFreezePane(2,1);
  SheetConditionalFormatting sheetCF=sheet.getSheetConditionalFormatting();
  String address="String_Node_Str" + Math.max(Integer.valueOf(sheet.getLastRowNum()),2);
  CellRangeAddress[] regions={CellRangeAddress.valueOf(address)};
  ConditionalFormattingRule rule1=sheetCF.createConditionalFormattingRule("String_Node_Str");
  PatternFormatting fill1=rule1.createPatternFormatting();
  fill1.setFillBackgroundColor(IndexedColors.GREY_25_PERCENT.index);
  fill1.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
  ConditionalFormattingRule rule2=sheetCF.createConditionalFormattingRule("String_Node_Str");
  FontFormatting font=rule2.createFontFormatting();
  font.setFontColorIndex(IndexedColors.GREY_25_PERCENT.index);
  font.setFontStyle(true,false);
  sheetCF.addConditionalFormatting(regions,rule1,rule2);
  sheet.setAutoFilter(new CellRangeAddress(0,sheet.getLastRowNum(),0,titles.length + def.getMapping().size() - 1));
  XSSFSheet xSheet=(XSSFSheet)sheet;
  CTAutoFilter sheetFilter=xSheet.getCTWorksheet().getAutoFilter();
  CTFilterColumn filterColumn1=sheetFilter.addNewFilterColumn();
  filterColumn1.setColId(6);
  CTCustomFilters filters=filterColumn1.addNewCustomFilters();
  CTCustomFilter filter1=filters.addNewCustomFilter();
  filter1.setOperator(STFilterOperator.NOT_EQUAL);
  filter1.setVal("String_Node_Str");
  CTFilterColumn filterColumn2=sheetFilter.addNewFilterColumn();
  filterColumn2.setColId(26);
  CTFilters filters2=filterColumn2.addNewFilters();
  filters2.setBlank(true);
  for (  Row row : sheet) {
    if (row.getRowNum() > 0 && (!row.getCell(6).getStringCellValue().equals("String_Node_Str") || !row.getCell(26).getStringCellValue().isEmpty())) {
      ((XSSFRow)row).getCTRow().setHidden(true);
    }
  }
  sheet.setActiveCell(new CellAddress(sheet.getRow(1).getCell(0)));
  wb.write(outStream);
  flush();
  close();
}