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How to output large csv file through Apache POI Excel in java?

Struggling to write 300k rows to csv file through Apache POI java. I have been trying to generate a csv file from an excel file with 300k rows. Everytime, I get GCOutMemory error when it tries to write to output csv file. I even tried splitting the write for every 100k rows. The output file size keeps on growing but I don't see system.println statement isnt getting printed.
import javafx.beans.binding.StringBinding;
import org.apache.poi.hssf.record.crypto.Biff8EncryptionKey;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryType;
import java.math.BigDecimal;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ReadWrite {
private static Logger logger= LoggerFactory.getLogger(ReadWrite.class);
public static void main(String[] args) {
try {
long startReading = System.currentTimeMillis();
Path path = Paths.get("/Users/venkatesh/Documents/Citiout_files/citiout300k_2sheets.xlsx");
byte[] result = new byte[0];
try {
result = Files.readAllBytes(path);
} catch (IOException e) {
e.printStackTrace();
}
InputStream is = new ByteArrayInputStream(result);
Workbook workbook = WorkbookFactory.create(is);
long readDone = System.currentTimeMillis() - startReading;
logger.info("read time " + readDone);
Sheet sheet = workbook.getSheetAt(1);
Row firstRow = sheet.getRow(0);
int headcol = firstRow.getLastCellNum();
long startTransform = System.currentTimeMillis();
firstRow.createCell(headcol++).setCellValue("Sold Amount1");
firstRow.createCell(headcol++).setCellValue("CF_Quantity1");
firstRow.createCell(headcol++).setCellValue("CF_Quantity2");
firstRow.createCell(headcol++).setCellValue("CF_TradePrice");
firstRow.createCell(headcol++).setCellValue("CF_ForwardPrice");
firstRow.createCell(headcol++).setCellValue("CF_UnrealizedPL");
firstRow.createCell(headcol++).setCellValue("CF_Quantity1Round");
firstRow.createCell(headcol++).setCellValue("CF_Quantity2Round");
firstRow.createCell(headcol++).setCellValue("CF_FXLotKeyNoTradeDate");
firstRow.createCell(headcol++).setCellValue("CF_FXRoundedKeyNoTradeDate");
firstRow.createCell(headcol++).setCellValue("CF_SettlementDate");
for (int i = 1; i <=sheet.getLastRowNum()+1; i++) {
String jj="";
Row nRow = sheet.getRow(i-1);
for(Cell c:nRow) {
if (c.getColumnIndex()==3 && i!=1) {
Calendar cal = Calendar.getInstance();
Date date1 = new SimpleDateFormat("dd-MMM-yyyy").parse(c.getStringCellValue());
cal.setTime(date1);
jj = String.valueOf(cal.get(Calendar.MONTH)+1) + "/" + String.valueOf(cal.get(Calendar.DAY_OF_MONTH)) + "/" + String.valueOf(cal.get(Calendar.YEAR));
}
}
int count = nRow.getLastCellNum();
//System.out.println(nRow.getCell(3).getClass());
nRow.createCell(count++).setCellFormula("G" + i + "*-1");
nRow.createCell(count++).setCellFormula("E" + i + "/" + "G" + i);
nRow.createCell(count++).setCellFormula("G" + i + "/E" + i);
nRow.createCell(count++).setCellFormula("ROUND(ABS(T" + i + "/S" + i + "),6)");
nRow.createCell(count++).setCellFormula("ROUND(K" + i + ",6)");
nRow.createCell(count++).setCellFormula("ROUND(N" + i + ",2)");
nRow.createCell(count++).setCellFormula("ROUND(S" + i + ",0)");
nRow.createCell(count++).setCellFormula("ROUND(T" + i + ",0)");
nRow.createCell(count++).setCellFormula("CONCATENATE(T" + i + "," + "\"~\"" + ",S" + i + ")");
nRow.createCell(count++).setCellFormula("CONCATENATE(X" + i + "," + "\"~\"" + ",Y" + i + ")");
nRow.createCell(count++).setCellValue(jj);
c.setCellValue(DateUtil.getExcelDate(calendar.getTime()));
}
long endTransform = System.currentTimeMillis() - startTransform;
System.out.println("Transformations time " + endTransform);
final FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
FileWriter writer= new FileWriter(new enter code hereFile("/Users/venkatesh/Documents/cit300k.csv"));
StringBuilder data = new StringBuilder();
Iterator<Row> rowIterator = workbook.getSheetAt(1).iterator();
try {
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
CellType type = cell.getCellType();
if (type == CellType.BOOLEAN) {
data.append(cell.getBooleanCellValue());
} else if (type == CellType.NUMERIC) {
data.append(cell.getNumericCellValue());
} else if (type == CellType.STRING) {
data.append(cell.getStringCellValue());
} else if (type == CellType.FORMULA) {
switch (evaluator.evaluateFormulaCell(cell)) {
case STRING:
data.append(cell.getStringCellValue());
break;
case NUMERIC:
data.append(cell.getNumericCellValue());
break;
}
} else if (type == CellType.BLANK) {
} else {
data.append(cell + "");
}
data.append(",");
}
writer.append(data.toString());
writer.append('\n');
}
} catch(Exception e){
e.printStackTrace();
}
finally{
if(writer!=null){
writer.flush();
writer.close();
}
}
for (MemoryPoolMXBean mpBean: ManagementFactory.getMemoryPoolMXBeans()) {
if (mpBean.getType() == MemoryType.HEAP) {
System.out.printf(
"Name: %s: %s\n",
mpBean.getName(), mpBean.getUsage()
);
}
}
try {
workbook.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
catch (Exception e){
e.printStackTrace();
}
}
}
20-01-12 19:52:49:267 INFO main ReadWrite:64 - read time 11354
Transformations time 38659
Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded
at java.util.TreeMap$Values.iterator(TreeMap.java:1031)
at org.apache.poi.xssf.usermodel.XSSFRow.cellIterator(XSSFRow.java:117)
at org.apache.poi.xssf.usermodel.XSSFRow.iterator(XSSFRow.java:132)
at org.apache.poi.xssf.usermodel.XSSFEvaluationSheet.getCell(XSSFEvaluationSheet.java:86)
at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:402)
at org.apache.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:275)
at org.apache.poi.ss.formula.WorkbookEvaluator.evaluate(WorkbookEvaluator.java:216)
at org.apache.poi.xssf.usermodel.BaseXSSFFormulaEvaluator.evaluateFormulaCellValue(BaseXSSFFormulaEvaluator.java:56)
at org.apache.poi.ss.formula.BaseFormulaEvaluator.evaluateFormulaCell(BaseFormulaEvaluator.java:185)
at ReadWrite.main(ReadWrite.java:150)

So now that we have a usable stacktrace, it is clear that the problem is NOT happening while writing the CSV file. It is actually happening while you are evaluating a spreadsheet formula. My guess is that the formula is summing across all rows in a sheet ... or something like that.
This is a problem, and there is probably no simple solution.
Here's what the POI documentation says:
File sizes/Memory usage
There are some inherent limits in the Excel file formats. These are defined in class SpreadsheetVersion. As long as you have enough
main-memory, you should be able to handle files up to these limits.
For huge files using the default POI classes you will likely need a
very large amount of memory.
There are ways to overcome the main-memory limitations if needed:
For writing very huge files, there is SXSSFWorkbook which allows to do a streaming write of data out to files (with certain
limitations on what you can do as only parts of the file are held in
memory).
For reading very huge files, take a look at the sample XLSX2CSV which shows how you can read a file in streaming
fashion (again with some limitations on what information you can read
out of the file, but there are ways to get at most of it if
necessary).
You are clearly running into these memory limitations. Basically, POI is trying to load too much of the spreadsheet into memory ... while you are evaluating the spreadsheet formulae ... and you are filling the heap.
One solution would be to increase the Java heap size. Or if you are already using all available RAM for your heap, run the conversion on a machine with more RAM. A lot of standard PCs have 16GB RAM these days. Maybe it is time for a hardware upgrade? But I'm guessing you have already thought of this.
If increasing the heap size is not viable, then you will need to rewrite your application to use SXSSFWorkbook. Furthermore, you may need to replace your approach of using formula evaluation with doing the calculations in native Java in a way that is compatible with row-by-row streaming of the spreadsheet. (It will depend on what the formulae do.)
Look at the linked example from the POI documentation for ideas.

Unexpected record type (org.apache.poi.hssf.record.HyperlinkRecord)

The problem:
I'm just trying to open it .xls file using the Apache-poi 4.1.0 library and it gives the same error as 4 years ago in a similar question.
I already tried
to put version 3.12-3.16.
3.13 as well
All versions can open blank .xls and filled by myself but not this one.
This document is generated automatically and I need to make a program that accepts it.
I already made a .Net standart library C# which is work, I tried to use xamarin android it's a horror, the app weighs 50 mb vs 3 mb due to various terrible SDK link errors, but that's a different story. So I decided to do it on Kotlin.
Code is from the documentation
You can check file on git
val inputStream = FileInputStream("./test.xls")
val wb = HSSFWorkbook(inputStream)
I expect no errors while opening xls.
Actual output is
Exception in thread "main" java.lang.RuntimeException: Unexpected record type (org.apache.poi.hssf.record.HyperlinkRecord)
at org.apache.poi.hssf.record.aggregates.RowRecordsAggregate.<init>(RowRecordsAggregate.java:97)
at org.apache.poi.hssf.model.InternalSheet.<init>(InternalSheet.java:183)
at org.apache.poi.hssf.model.InternalSheet.createSheet(InternalSheet.java:122)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:354)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:400)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:381)
at ru.plumber71.toolbox.ExcelParcerKt.main(ExcelParcer.kt:19)
at ru.plumber71.toolbox.ExcelParcerKt.main(ExcelParcer.kt)
The document will not be modified in any way. If there any other libraries to just read the dataset or strings from the .xls file will be OK.

After some investigation I found the problem with your test.xls file.
According the file format specifications, all HyperlinkRecords should be together in the Hyperlink Table. It is contained in the Sheet Substream following the cell records. In your case the HyperlinkRecords are between other records (between NumberRecords and LabelSSTRecords in that case). So I suspect it was not Excel what had created that test.xls file.
Excelmight be tolerant enough to open that file nevertheless. But you cannot expect that apache poi also tries to tolerate all possible violations in file format. If you open the file using Excel and then re-save it, apache poi is able creating the Workbookafter that.
Apache poi is not able repairing this as Excel can do. But one could read the POIFSFileSystem a low level way and filtering out the HyperlinkRecords that are between other records. That way one could read the content using apache poi, of course except the hyperlinks.
Example:
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.NameRecord;
import org.apache.poi.hssf.record.NameCommentRecord;
import org.apache.poi.hssf.record.HyperlinkRecord;
import org.apache.poi.hssf.record.RecordFactoryInputStream;
import org.apache.poi.hssf.record.RecordFactory;
import org.apache.poi.hssf.model.RecordStream;
import org.apache.poi.hssf.model.InternalWorkbook;
import org.apache.poi.hssf.model.InternalSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFName;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.util.CellReference;
import java.util.List;
import java.util.ArrayList;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Constructor;
class ExcelOpenHSSF {
public static void main(String[] args) throws Exception {
String fileName = "test(2).xls";
try (InputStream is = new FileInputStream(fileName);
POIFSFileSystem fileSystem = new POIFSFileSystem(is)) {
//find workbook directory entry
DirectoryNode directory = fileSystem.getRoot();
String workbookName = "";
for(String wbName : InternalWorkbook.WORKBOOK_DIR_ENTRY_NAMES) {
if(directory.hasEntry(wbName)) {
workbookName = wbName;
break;
}
}
InputStream stream = directory.createDocumentInputStream(workbookName);
//loop over all records and manipulate if needed
List<Record> records = new ArrayList<Record>();
RecordFactoryInputStream recStream = new RecordFactoryInputStream(stream, true);
//here we filter out the HyperlinkRecords that are between other records (NumberRecords and LabelSSTRecords in that case)
//System.out.println prints the problematic records
Record record1 = null;
Record record2 = null;
while ((record1 = recStream.nextRecord()) != null) {
record2 = recStream.nextRecord();
if (!(record1 instanceof HyperlinkRecord) && (record2 instanceof HyperlinkRecord)) {
System.out.println(record1);
System.out.println(record2);
records.add(record1);
} else if ((record1 instanceof HyperlinkRecord) && !(record2 instanceof HyperlinkRecord)) {
System.out.println(record1);
System.out.println(record2);
records.add(record2);
} else {
records.add(record1);
if (record2 != null) records.add(record2);
}
}
//now create the HSSFWorkbook
//see https://svn.apache.org/viewvc/poi/tags/REL_4_1_0/src/java/org/apache/poi/hssf/usermodel/HSSFWorkbook.java?view=markup#l322
InternalWorkbook internalWorkbook = InternalWorkbook.createWorkbook(records);
HSSFWorkbook wb = HSSFWorkbook.create(internalWorkbook);
int recOffset = internalWorkbook.getNumRecords();
Method convertLabelRecords = HSSFWorkbook.class.getDeclaredMethod("convertLabelRecords", List.class, int.class);
convertLabelRecords.setAccessible(true);
convertLabelRecords.invoke(wb, records, recOffset);
RecordStream rs = new RecordStream(records, recOffset);
while (rs.hasNext()) {
InternalSheet internelSheet = InternalSheet.createSheet(rs);
Constructor constructor = HSSFSheet.class.getDeclaredConstructor(HSSFWorkbook.class, InternalSheet.class);
constructor.setAccessible(true);
HSSFSheet hssfSheet = (HSSFSheet)constructor.newInstance(wb, internelSheet);
Field _sheets = HSSFWorkbook.class.getDeclaredField("_sheets");
_sheets.setAccessible(true);
#SuppressWarnings("unchecked")
List<HSSFSheet> sheets = (ArrayList<HSSFSheet>)_sheets.get(wb);
sheets.add(hssfSheet);
}
for (int i = 0 ; i < internalWorkbook.getNumNames() ; ++i){
NameRecord nameRecord = internalWorkbook.getNameRecord(i);
Constructor constructor = HSSFName.class.getDeclaredConstructor(HSSFWorkbook.class, NameRecord.class, NameCommentRecord.class);
constructor.setAccessible(true);
HSSFName name = (HSSFName)constructor.newInstance(wb, nameRecord, internalWorkbook.getNameCommentRecord(nameRecord));
Field _names = HSSFWorkbook.class.getDeclaredField("names");
_names.setAccessible(true);
#SuppressWarnings("unchecked")
List<HSSFName> names = (ArrayList<HSSFName>)_names.get(wb);
names.add(name);
}
//now the workbook is created properly
System.out.println(wb);
/*
//getting the data
DataFormatter formatter = new DataFormatter();
Sheet sheet = wb.getSheetAt(0);
for (Row row : sheet) {
for (Cell cell : row) {
CellReference cellRef = new CellReference(row.getRowNum(), cell.getColumnIndex());
System.out.print(cellRef.formatAsString());
System.out.print(" - ");
String text = formatter.formatCellValue(cell);
System.out.println(text);
}
}
*/
}
}
}

I was able to open a file of this "corrupted" type by using JExcel API
But using poi.apache.org also opens the file if manually resave it using excel application. (It may not be suitable for someone)
Sorry that it was asking strange questions. Thank you all and hope that someone may find useful.
val inputStream = FileInputStream("./testCorrupted.xls")
val workbook = Workbook.getWorkbook(inputStream)
val sheet = workbook.getSheet(0)
val cell1 = sheet.getCell(0, 0)
print(cell1.contents + ":")

Copy HTML content into Excel by Java

I am a Java beginner and it would be grateful if you could help to provide some sample codes or guidelines for below situation
I have a large number of html files, each file contains some school's info. Each html file may locate at different hierarchy of folder path but for sure it is always in the lowest level of the folder path. And some folders may have no school html files
For example
C:\schools\england\london\hampstead\school_A.html [1 html in 1 folder]
C:\schools\england\london\southwark\school_B.html [multiple files in 1 folder]
C:\schools\england\london\southwark\school_C.html
C:\schools\england\london\southwark\school_D.html
C:\schools\wales\monmouth\school_E.html [file at different path level]
C:\schools\scotland\aberdeen\aberdeen [folder has no file]
HTML CONTENT TO BE COPIED
< h1 id="MainControl_CustomFunctionality_ZoneMain_EmbeddedUserControlPlaceholderControl1_ctl01_schoolName" class="schoolName">**school_A**</h1>
< li id="MainControl_CustomFunctionality_ZoneMain_EmbeddedUserControlPlaceholderControl1_ctl01_boardingTypeContainer" style="list-style: none;"><span>Day/boarding type:</span> <span id="MainControl_CustomFunctionality_ZoneMain_EmbeddedUserControlPlaceholderControl1_ctl01_boardingType" class="infoDetail">**Day, full boarding and weekly boarding**</span></li>
< li id="MainControl_CustomFunctionality_ZoneMain_EmbeddedUserControlPlaceholderControl1_ctl01_boardingFeeContainer" style="list-style: none;"><span>Boarding fees per term:</span> <span id="MainControl_CustomFunctionality_ZoneMain_EmbeddedUserControlPlaceholderControl1_ctl01_boardingFee" class="infoDetail">**£7,317 to £8,370**</span></li>
EXPECTED RESULTS IN EXCEL TABLE
3 Columns Headers: "SCHOOL" "BOARDING TYPE" "BOARDING FEES PER TERM"
Row 1: "**school_A**" "**Day,full boarding and weekly boarding**" "**£7,317 to £8,370**"
Thank you very much for your help

I have some code for this requirement. Please follow this according to your requirement.
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class HTMLToExcel
{
public static void main(String[] args)
{
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(new File("D:\\Excels\\log_km_styles1.html")));
// Create Work book
XSSFWorkbook xwork = new XSSFWorkbook();
// Create Spread Sheet
XSSFSheet xsheet = xwork.createSheet("MyFristSheet");
//Create Row (Row is inside spread sheet)
XSSFRow xrow = null;
int rowid =0;
String line ;
while (( line =br.readLine())!= null) {
// Create font for applying bold or italic or same thing else on the content
/*XSSFFont xfont = xwork.createFont();
xfont.setBoldweight(xfont.BOLDWEIGHT_BOLD);
XSSFCellStyle xstyle = xwork.createCellStyle();
xstyle.setFont(xfont);*/
System.out.println(line);
String split[] = line.split("<br>");
Cell cell;
for (int i = 0; i < split.length; i++) {
xrow = xsheet.createRow(rowid);
cell = xrow.createCell(2);
cell.setCellValue(split[i]);
String[] columnSplit = split[i].split("\\W+");
int columnCount = 3;
for (int j = 0; j < columnSplit.length; j++) {
cell = xrow.createCell(columnCount++);
cell.setCellValue(columnSplit[j]);
}
System.out.println(split[i]);
rowid++;
}
}
// create date for adding this to our workbook name like workbookname_date
Date d1 = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yy");
String todaysDate = sdf.format(d1);
System.out.println(sdf.format(d1));
//Create file system using specific name
FileOutputStream fout = new FileOutputStream(new File("D:\\Excels\\redaingfromHTMLFile_"+todaysDate+".xlsx"));
xwork.write(fout);
fout.close();
System.out.println("redaingfromHTMLFile_"+todaysDate+".xlsx written successfully" );
}
catch (Exception e) {
e.printStackTrace();
}
}
}
Above code converts html file content into Excel file. It will create new file with today's date in the file name. try with this one. I hope it will help you

Using hashmap for POI Java XLSX

I have been trying to edit my code to allow a XLSX file to be uploaded and be able to be read on the website. But after countless tries, the data I typed into the XLSX File is unable to be captured on the website. (Eg: After downloading the XLSX Template from the website, I am able to type in anything that I want in the XLSX file and able to upload it again to the website so I do not need to keep on adding new data by clicking "new" every single time. I can just type in everything in that XLSX File all at once and upload it right away)
I was told to use hashmap but I am unsure of the way it works. The codes I have currently only enables the website to capture the header title and I am not suppose to use jxl.
While removing those codes that has jxl, I encounter some errors (being underline in red).
public HashMap getConstructJXLList_xlsx(UploadedFile File, int Sheetindex) {
String _LOC = "[PageCodeBase: getConstructJXLList]";
HashMap _m = new HashMap();
InputStream _is = null;
try {
_is = File.getInputstream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
XSSFWorkbook workbook;
XSSFSheet s;
try {
workbook = new XSSFWorkbook(_is);
s = workbook.getSheetAt(Sheetindex);
} catch (Exception e) {
System.out.println(_LOC + "1.0 " + " Test:");
int _totalc = getColumns(); //getColumns is being underline in red
int _totalr = getRows(); //getRows is being underline in red
// Header r=0
String[] _st = new String[_totalc];
//XSSFSheet sheet = null;
for (int _c = 0; _c < _totalc; _c++) {
_st[_c] = getCell(_c, 0); //getCell is being underline in red
}
_m.put("HEADER", _st);
System.out.println(_LOC + "1.0 " + " _m:" + _m);
// Data r=1 thereafter
List _l = new ArrayList();
for (int _r = 1; _r < _totalr; _r++) {
Object[] _o = new Object[_totalc];
String _s_r = null;
for (int _c = 0; _c < _totalc; _c++) {
_o[_c] = getCell(_c, _r);
String _cn = _o[_c].getClass().getName();
String _s_c = null;
if (!isEmptyNull(_s_c)) {
_s_r = "record_available";
}
}
if ((_o != null) && (_o.length != 0)) {
_l.add(_o);
}
}
_m.put("DATA", _l);
System.out.println(_LOC + "1.0 " + " _m:" + _m);
}
return _m;
}
Do you mind helping me to solve this? Why there isn't any data being capture in the website? The error shown is "The method getColumns/getCell/getRows is undefined for the type PageCodeBase." And the help/quick fix given is to create a new method. But after creating the new method, I am unsure of what to add in the methods. Have tried various example (http://snippetjournal.wordpress.com/2014/02/05/read-xlsx-using-poi/) but I stil can't seem to get it work out.

I would recommend you to manage de excel file using this classes from the apache POI api
org.apache.poi.ss.usermodel.Cell;
org.apache.poi.ss.usermodel.Row;
org.apache.poi.ss.usermodel.Sheet;
org.apache.poi.ss.usermodel.Workbook;
org.apache.poi.ss.usermodel.WorkbookFactory;
instead of those XSSFWorkbook, XSSFSheet...
And also when accessing the file input stream try doing it this way:
FileInputStream input = new FileInputStream(new File("C:\\Users\\admin\\Desktop\\Load_AcctCntr_Template.xlsx"));
Workbook workBook = WorkbookFactory.create(stream);
workBook.getSheetAt(0);

use this.
FileInputStream input = new FileInputStream(new File("C:/Users/admin/Desktop/Load_AcctCntr_Template.xlsx"));
Workbook wb = WorkbookFactory.create(input);
as mentioned in user3661357 answer. use
Workbook instead of XSSFWorkbook.
Sheet instead of XSSFSheet.
etc..
Also read this
Getting Exception(org.apache.poi.openxml4j.exception - no content type [M1.13]) when reading xlsx file using Apache POI?
*HINT > use ALT+SHIFT+I in netbeans to load the necessary packages.
A working example
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
public class POITest {
public static void test() {
try {
FileInputStream input = new FileInputStream(new File("C:/Users/kingslayer/Desktop/test/a.xlsx"));
Workbook wb = WorkbookFactory.create(input);
Sheet s = wb.getSheetAt(0);
Iterator<Row> rows = s.rowIterator();
while (rows.hasNext()) {
Row row = rows.next();
Iterator cells = row.cellIterator();
while (cells.hasNext()) {
Cell cell = (Cell) cells.next();
if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
System.out.print(cell.getStringCellValue() + "t");
} else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
System.out.print(cell.getNumericCellValue() + "t");
} else if (cell.CELL_TYPE_BLANK == cell.getCellType()) {
System.out.print("BLANK ");
} else {
System.out.print("Unknown cell type");
}
}
input.close();
}
} catch (IOException | InvalidFormatException ex) {
Logger.getLogger(POITest.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String[] args) {
test();
}
}
All the libraries you must have on the project path.
commons-codec-1.5.jar ,
commons-logging-1.1.jar ,
dom4j-1.6.1.jar ,
junit-3.8.1.jar ,
log4j-1.2.13.jar ,
poi-3.9-20121203.jar ,
poi-excelant-3.9-20121203.jar ,
poi-ooxml-3.9-20121203.jar ,
poi-ooxml-schemas-3.9-20121203.jar ,
poi-scratchpad-3.9-20121203.jar ,
stax-api-1.0.1.jar ,
xmlbeans-2.3.0.jar ,

1) get rid of POIFSFileSystem fs = new POIFSFileSystem(input); as you are not using it
2) input.close(); is called after first iteration of row

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xmlbeans/XmlException

I have to read xls file in java.I used poi-3.6 to read xls file in Eclipse.But i m getting this ERROR"Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xmlbeans/XmlException at ReadExcel2.main(ReadExcel2.java:38)".
I have added following jars
1)poi-3.6-20091214.jar
2)poi-contrib-3.6-20091214.jar
3)poi-examples-3.6-20091214.jar
4)poi-ooxml-3.6-20091214.jar
5)poi-ooxml-schemas-3.6-20091214.jar
6)poi-scratchpad-3.6-20091214.jar
Below is the code which i m using:
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
public class ReadExcel {
public static void main(String[] args) throws Exception {
//
// An excel file name. You can create a file name with a full path
// information.
//
String filename = "C:\\myExcel.xl";
//
// Create an ArrayList to store the data read from excel sheet.
//
List sheetData = new ArrayList();
FileInputStream fis = null;
try {
//
// Create a FileInputStream that will be use to read the excel file.
//
fis = new FileInputStream(filename);
//
// Create an excel workbook from the file system.
//
// HSSFWorkbook workbook = new HSSFWorkbook(fis);
Workbook workbook = new XSSFWorkbook(fis);
//
// Get the first sheet on the workbook.
//
Sheet sheet = workbook.getSheetAt(0);
//
// When we have a sheet object in hand we can iterator on each
// sheet's rows and on each row's cells. We store the data read
// on an ArrayList so that we can printed the content of the excel
// to the console.
//
Iterator rows = sheet.rowIterator();
while (rows.hasNext()) {
Row row = (XSSFRow) rows.next();
Iterator cells = row.cellIterator();
List data = new ArrayList();
while (cells.hasNext()) {
Cell cell = (XSSFCell) cells.next();
data.add(cell);
}
sheetData.add(data);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
fis.close();
}
}
showExelData(sheetData);
}
private static void showExelData(List sheetData) {
//
// Iterates the data and print it out to the console.
//
for (int i = 0; i < sheetData.size(); i++) {
List list = (List) sheetData.get(i);
for (int j = 0; j < list.size(); j++) {
Cell cell = (XSSFCell) list.get(j);
System.out.print(cell.getRichStringCellValue().getString());
if (j < list.size() - 1) {
System.out.print(", ");
}
}
System.out.println("");
}
}
}
Please help.
thanks in anticipation,
Regards,
Dheeraj!

You need xmlbeans on your classpath.
NoClassDefFoundError means that:
The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.
So next time you get an exception like this, it means that some 3rd party library requires another 3rd party library. Then use google (or any other means) to find which library this is.
Furthermore, most libraries state clearly in their documentations and/or distributions what are their dependencies.

JarFinder suggests XMLBeans.jar

Had the same error on Apache POI 3.16. Added the following jars from Apache POI /ooxml-lib/xmlbeans-2.6.0 and for the next exception regarding collections /lib/commons-collections4-4.1.jar to fix.

I had similar situation in linux env, basically my lib path level was off by 1.