org.apache.poi.xssf.streaming
Classes 
GZIPSheetDataWriter
SheetDataWriter
SXSSFCell
SXSSFCreationHelper
SXSSFEvaluationWorkbook
SXSSFFormulaEvaluator
SXSSFRow
SXSSFSheet
SXSSFWorkbook
Exceptions 
SXSSFFormulaEvaluator.RowFlushedException
SXSSFFormulaEvaluator.SheetsFlushedException