How to get more than 255 columns in an excel sheet using Apache POI 3.6

user_142824 0
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I'm creating a calendar in excel. Column 1 is 01.01.2010 (dd.MM.yyyy), Column 2 is 02.01.2010 and so on.

This is my code:

int day_cell = 0;

for(int i = 0; i < days.size(); i++)
{
     Date day = days.get(i);

     HSSFCell cell = row.createCell(day_cell++);
     cell.setCellValue(day.toString());
}

When I get to column 256 POI throws this exception:

java.lang.IllegalArgumentException: Invalid column index (256).  Allowable column range for BIFF8 is (0..255) or ('A'..'IV')
at org.apache.poi.hssf.usermodel.HSSFCell.checkBounds(HSSFCell.java:926)
at org.apache.poi.hssf.usermodel.HSSFCell.<init>(HSSFCell.java:162)
at org.apache.poi.hssf.usermodel.HSSFRow.createCell(HSSFRow.java:141)
at org.apache.poi.hssf.usermodel.HSSFRow.createCell(HSSFRow.java:119)

I found this bug-report suggesting it was fixed in the 3.6 release. We were using 3.5 but changing to 3.6 doesn't seem to do any good. Anyone got any tips?

https://issues.apache.org/bugzilla/show_bug.cgi?id=46806

Edit: Seems like the bug-issue was about formulas..

apache-poi excel java
6 Answers
user_278250

I figured it out. I had to switch from the org.apache.poi.hssf.usermodel to the org.apache.poi.ss.usermodel

This allows you to use 16k columns or something like that.

user_1428240

You might consider switching from portrait to landscape (in other words, transposing the data) so that you get to use 65k rows for days of the year. This is exactly what I did with a report requiring a large number of columns and small number of rows.

Alternatively, you might split the year in 6-month sub periods, each one on its own sheet.

These are both stopgap solutions, but might provide you with a "good enough" solution, depending on the requirements you have. 

user_2796230

How to get more than 255 columns in an excel sheet using Apache POI
try 

Workbook workbook = new XSSFWorkbook()

<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi-ooxml</artifactId>`enter code here`
   <version>3.15</version>
  </dependency>

  <dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi</artifactId>
   <version>3.15</version>
  </dependency>
user_98115100
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