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Is it possible to set the active range with Apache POI XSSF?

I am using Apache POI XSSF to read and write Excel Sheets.
I know that I can set the active cell on a worksheet by using Sheet.setActiveCell(CellAddress address).
However, I'd like to set it to a Range containing more than one cell on the sheet, as illustrated by the picture below:
When I save a sheet with multiple cells selected using Excel those are selected upon opening the saved file.
Is there a way to do this with POI XSSF?

you can use following line to achieve a ranke as active cell in excel:
sheet.setActiveCell("A1:B2");
Hope it helps.
As from 3.16 onwards the setActiveCell(String) method is deprecated and you do not want to use a deprecated method I would suggest to create your own CellAddress:
public class CellRangeAddress extends CellAddress {
private CellAddress start;
private CellAddress end;
public CellRangeAddress(final CellAddress start, final CellAddress end) {
super(start);
this.start = start;
this.end = end;
}
#Override
public String formatAsString() {
if (end != null) {
return start.formatAsString() + ":" + end.formatAsString();
}
return super.formatAsString();
}
}
and use ist like:
sheet.setActiveCell(new CellRangeAddress(new CellAddress("A1"), new CellAddress("B2")));
Not the cleanest and best way, but works without warnings.

Can't add worksheets to an excel file through my R script

I'm trying to create a workbook with several spreadsheets where I have to pass three data frames to each sheet. However, I'm having problems creating the sheets, having the following error:
Error in .jcall(wb, "Lorg/apache/poi/ss/usermodel/Sheet;",
"createSheet", : method createSheet with signature
(D)Lorg/apache/poi/ss/usermodel/Sheet; not found
I'm using the xlsx package and the relevant code part is the following:
wb <- createWorkbook(type="xlsx")
saveWorkbook(wb, 'output.xlsx')
for (i in year)
{
sheet.1 <- createSheet(wb, sheetName = i)
data.filter <- realdata[realdata$year_ == i,]
data.filter <- data.filter[data.filter$month_ >= month[1],]
data.filter <- data.filter[data.filter$month_ <= month[4],]
ptable_data_usado <- cast(data.filter, mondat ~ BASE, value = "myidx")
correl_usado <- cor(ptable_data_usado)
addDataFrame(correl_usado, sheet = i, startRow = 0, startColumn = 0)
ptable_data_prx <- cast(data.filter, mondat ~ NearestBaseName, value = "myidx")
correl_prx <- cor(ptable_data_prx)
addDataFrame(correl_prx, sheet = i, startRow = 14, startColumn = 0)
}

I ran into a similar problem. My solution was to coerce sheet name into a character.
So in your case it might be
sheet.1 <- createSheet(wb, sheetName = as.character(i))
Hope it will help.

xlsx package is using rJava to call functions written in JAVA from the APACHE POI project for functionality.
The function to creat worksheet is declared as:
public XSSFSheet createSheet(java.lang.String sheetname)
this means that you need to pass a string to the function. Return back to R, the sheet name must be a character vector. #Oleksii-Sh answer is right.
Or you can use:
sheet.1 <- createSheet(wb, sheetName = paste0("sheet", i))
if you want to name it sheet1, sheet2 ...

Can't be positive without a reproducible example, but it looks like the problem is the two lines where you have sheet = i. Instead, it should be sheet = sheet.1.
In addition, startRow and startColumn need to be integers greater than zero, though that would give an out-of-allowable-range error, rather than a not-found error.
Also, saveWorkbook(wb, 'output.xlsx') should come after the loop.

Insert new row into LibreOffice writer table using UNO

I have recently tried to code a small java file which will insert a row into an already existing table in a .odt document. The table itself has 4 rows and 3 column, but I would like to implement a check which will expand that table if the content to be inserted is larger than 4. However, every time I try to get the table's rows, it returns a null pointer. I am not that familiar with UNO api, but as far as i read through the documentation, the class XColumnsAndRowRange should be used in this situation. My code is as follows:
XTextTablesSupplier xTablesSupplier = (XTextTablesSupplier) UnoRuntime.queryInterface(XTextTablesSupplier.class, xTextDocument);
XNameAccess xNamedTables = xTablesSupplier.getTextTables();
try {
Object table = xNamedTables.getByName(tblName);
XTextTable xTable = (XTextTable) UnoRuntime.queryInterface(XTextTable.class, table);
XCellRange xCellRange = (XCellRange) UnoRuntime.queryInterface(XCellRange.class, table);
if(flag){
XColumnRowRange xCollumnAndRowRange =(XColumnRowRange)
UnoRuntime.queryInterface(XColumnRowRange.class, xCellRange);
XTableRows rows = xCollumnAndRowRange.getRows();
System.out.println("Testing if this works");
rows.insertByIndex(4, size-4);
}
I am not sure if I am missing something here or if I should be using a different function.

As Lyrl suggested, this works:
XTableRows rows = xTable.getRows();
Apparently XColumnRowRange is only used for spreadsheets.
Note: With Basic or Python you would not have this problem, because those languages do not need queryInterface. The code would simply be:
table = tables.getByName(tblName)
rows = table.getRows()

Apache POI : Update cells in a named range

I am using Apache POI library to read/write to xlsx. In my original xlsx, I have a namedrange "XYZ".
I want to update the values of cells within this name range. How can I do that?
I did this:
XSSFName name = workbook.getName("XYZ");
String formula = name.getRefersToFormula();
System.out.println("Formula = " + formula);
Now, I dont know how to get a handle to individual cell in this named range.
Can anyone please point me to the correct API that I can use?
Rgds
Sapan

There is an example from the Busy Developers' Guide for retrieving the cells in the range. Then you can use Cell.setCellValue() to update.
// setup code
String cname = "TestName";
Workbook wb = getMyWorkbook(); // retrieve workbook
// retrieve the named range
int namedCellIdx = wb.getNameIndex(cname);
Name aNamedCell = wb.getNameAt(namedCellIdx);
// retrieve the cell at the named range and test its contents
AreaReference aref = new AreaReference(aNamedCell.getRefersToFormula());
CellReference[] crefs = aref.getAllReferencedCells();
for (int i=0; i<crefs.length; i++) {
Sheet s = wb.getSheet(crefs[i].getSheetName());
Row r = s.getRow(crefs[i].getRow());
Cell c = r.getCell(crefs[i].getCol());
// extract the cell contents based on cell type etc.
}

Accessing Field Settings of Pivot Table using Apache POI

I am creating a workbook with a sheet populated data from a data source then creating a second sheet with a pivot table view of that data. Everything works fine, but I can't seem to change the default look of the pivot table. I am trying to get the setting ( Row Labels-->Click one from the list-->Field Settings-->Subtotals-->None and Row Labels-->Click one from the list-->Field Settings-->Layout & Print-->'Show item labels in tabular form' ) checked while creating the pivot table but couldn't find the handle / flag in the POI. Tried finding something under pivotTable.getCTPivotTableDefinition() or pivotTable.getCTPivotTableDefinition().getPivotTableStyleInfo(), but no lock. Please advise if there is a way to set these settings using poi during pivot table creation, not after the fact following the steps mentioned in the parenthesis. Here is my pivot table code :
XSSFSheet sheet = (XSSFSheet)wb.createSheet("Data");
...
...
//filling data sheet, skipping this part as it's not relevant
...
XSSFSheet pivotSheet = (XSSFSheet)wb.createSheet("Pivot Table");
AreaReference source = new AreaReference(sheet.getSheetName()+"!A$1:W$"+String.valueOf(sheet.getLastRowNum()));
CellReference position = new CellReference("A3");
XSSFPivotTable pivotTable = pivotSheet.createPivotTable(source, position);
/* Add filters */
pivotTable.addRowLabel(17);
pivotTable.addRowLabel(20);
pivotTable.addRowLabel(21);
pivotTable.addRowLabel(22);
pivotTable.addRowLabel(13);
pivotTable.addRowLabel(19);
pivotTable.addRowLabel(6);
pivotTable.addRowLabel(0);
pivotTable.addRowLabel(18);
pivotTable.addRowLabel(1);
pivotTable.addRowLabel(7);
pivotTable.addRowLabel(9);

Finally figured it out; lack of good documentation forced me to try a zillion things and finally was able to achieve what I wanted; here is the code :
for(CTPivotField ctPivotField:pivotTable.getCTPivotTableDefinition().getPivotFields().getPivotFieldList()){
ctPivotField.setAutoShow(false);
ctPivotField.setOutline(false);
ctPivotField.setSubtotalTop(false);
ctPivotField.setSubtotalCaption("");
}

instead of creating the pivot table every time, I created one template XLS file with all the desired styling and included that in the source, now I am opening that file filling the necessary data in the source tab, and saving the XLS file with the dynamic data with a different name; since the Pivot table tab is marked to refresh when opened, it does the work. Instead of going through the POI API with the limitations on Pivot Tables, creating a template and using it is much easier and flexible if you will generate the same styled pivot table for dynamic data.

#ninjaxelite here how it goes :
List<Object[]> resultSet = //get raw data
XSSFWorkbook wb = null;
try {
wb = new XSSFWorkbook(new FileInputStream(this.getClass().getResource("/content/XLS_template.xlsx").getPath()));
} catch (FileNotFoundException e1) {
//error
} catch (IOException e1) {
//error
}
Map<String, CellStyle> styles = createStyles(wb); // some local function to get styles
XSSFSheet sheet = (XSSFSheet)wb.getSheetAt(0);
XSSFRow row;
XSSFCell cell;
int rowNum = 0;
for (Object[] aRow : resultSet) {
rowNum++;
row = sheet.createRow(rowNum);
cell = row.createCell(0);
cell.setCellValue((String)aRow[0]);
cell.setCellStyle(styles.get("cell_normal_centered"));
...
..
.