Don't create so many cell styles, reuse the same object so POI can simply point back to it.

http://jakarta.apache.org/poi/faq.html#faq-13


D. Alvarado wrote:

Hi,

I have generated a particularly large Excel document and when I try to open it, I get the message "Too many cell formats." Aside from the first row, I want all subsequent rows to have the same cell style. Currently, I'm making this call to every cell:

HSSFCellStyle cellStyle = wb.createCellStyle(); cellStyle.setWrapText(true);
cell.setCellStyle(cellStyle);

Is there some way I can set up a default cell style so I won't always have to invoke this code and thus, might prevent the "Too many cell formats" error?

Thanks in advance, Dave

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