I have used POI and Jexcel. POI uses as much memory as the file size and Jexcel take a lot of memory while loading a workbook. My requirement is to process an xls file in chunks, so as to reduce the memory consumption.
How to parse xls file containing multiple sheets, within 50MB of memory, in Java
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Apache POI provides a SAX like API to access Excel documents.
See Apache POI Event API: