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Get complete value out of excel cell with apache poi

Upon opening the xls sheet, I see a value of "13.09". If I click on that cell, I can see a value of "13.087100872". I need to extract the unrounded value for all cells without manually opening the excel file.
I have tried
cell.getNumericCellValue()
as well as
objectDefaultFormat.formatCellValue(cell, objFormulaEvaluator)
where objDefaultFormat is a DataFormatter and objFormulaEvaluator is a FormulaEvaluator:
DataFormatter objDefaultFormat = new DataFormatter();
FormulaEvaluator objFormulaEvaluator = new HSSFFormulaEvaluator((HSSFWorkbook) wb);
What do I need to do differently to get the unrounded value?

Switching between excel sheets in Apache POI

I am using Apache POI to generate excel sheets (.xls format) and I have used the following code snippet to create Hyperlinks that link to a different sheet in the same document/workbook.
HSSFSheet summarySheet = workbook.createSheet("Target Sheet");
Hyperlink targetLink = createHelper.createHyperlink(Hyperlink.LINK_DOCUMENT);
targetLink.setAddress("'Target Sheet'!A1");
There are more than one sheet that I'm creating and upon clicking the Hyperlink it shows the respective sheet. However, I'm having difficulty in traversing to the different sheets that I have created with the above lines of code. I need to populate those sheets with data from the database but I don't know how to switch between those sheets.
Any help would be appreciated. Please do let me know before you downvote/if there is anything wrong with my question. Thank you!

To get the sheets in existing xls you can use the HSSFWORKBOOK method getSheet("Sheet Name"):
HSSFSheet linkedSheet = workbook.getSheet("Sheet name");
once you have the linked sheet you can add the entries onto it.

Apache POI - Excel Write - Lock Single Cell

I am using Apache POI to generate Exccel Templete which my clients could download, add values and upload back.
I would like to set the cell values non editable so that the template headers could not be edited.
I tried this code but it does not work,
cell.getCellStyle().setLocked(true)
I also read that locking the excel sheet and then allowing the columns to setlocked(false) would work but I am not sure how many columns will be filled by client, so I want is all other columns t be edited except the one which I filled dynamically with Apache POI.
I hope my query is clear to understand.

Try the following code, it may solve your problem:
HSSFWorkbook workbook = new XSSFWorkbook();
// Cell styles. Note the setLocked(true) method call.
HSSFCellStyle lockedNumericStyle = workbook.createCellStyle();
lockedNumericStyle.setAlignment(XSSFCellStyle.ALIGN_RIGHT);
lockedNumericStyle.setLocked(true);
HSSFSheet sheet = workbook.createSheet("Protection Test");
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell(0);
cell.setCellValue(100);
cell.setCellStyle(lockedNumericStyle);
// This line should cause all locked cells to be protected,
// the user should not be able to change the cells
// contents.
sheet.protectSheet("password");
The password makes it possible to remove the protection from the sheet and makes it possible then for the locked cells to be modified.

I don't recall how well this works -- for example, I think that the client can unprotect the sheet using the menu -- but you do need to protect the sheet via something like Sheet.protectSheet("") (no password, but nevertheless a protected sheet.)

Excel generation in java

In Apache poi is there any provision for setting link between different sheets(For example i have an index page in my excel sheet which contains links to all my sheets. Can we do this for dynamic excel generation )? Is there any other libraries available for doing the same?

Yes that's possible, here is some example code:
Cell cell = sheet.createRow(0).createCell(0);
cell.setCellValue("Worksheet Link");
HSSFHyperlink link = new HSSFHyperlink(HSSFHyperlink.LINK_DOCUMENT);
link.setTextMark("'Target Sheet'!A1");
cell.setHyperlink(link);
Target Sheet is the name of the sheet to which the link should switch to and A1 is the target cell.

You can use setAddress Method also.
HSSFHyperlink linkToSheet=new HSSFHyperlink(HSSFHyperlink.LINK_DOCUMENT);
linkToSheet.setAddress("ToSheet!A115");

create Excel sheet between existing sheet using POI

I build the code to meet my client requirement using org.apache.poi.ss.usermodel.Sheet class
Now I got a new requirement to create a new excel sheet in between two existing sheets. In the existing excel file there are already three sheets at the index numbers p,1,2. I want to create a sheet at index number 2 moving the sheet at index number 2 to 3.
I could able to find the sheets names in Excel file using the code:
for (int i = 0; i < wb.getNumberOfSheets(); i++)
{
System.out.println("Sheet name: " + wb.getSheetName(i));
}
Also, I could able to find the sheet index numbres in Excel file using the code:
System.out.println("Sheet name: " + wb.getSheetIndex("Retail - All"));
The code I used to create a new sheet is: Sheet failuresSheet= wb.createSheet("Failures"); This is creating a new sheet at end. Please let me know the correct code for my requirement.
Remember that I used the class org.apache.poi.ss.usermodel.Sheet to meet my requirement.
Please let me know how to create a sheet at Index no 2 moving the sheet at index no 2 to 3. Thanks you in advance.

Look at this javadoc, you could change the shhet order with that method.
So you need:
wb.setSheetOrder("Failures",1); //the index is 0 based