when HSSFSheet has only one row, HSSFSheet#removeRow() does not work. stack trace is... java.lang.IllegalArgumentException: Invalid row number (-1) outside allowable range (0..65535) at org.apache.poi.hssf.usermodel.HSSFRow.setRowNum(HSSFRow.java:196) at org.apache.poi.hssf.usermodel.HSSFSheet.getRow(HSSFSheet.java:335) at org.apache.poi.hssf.usermodel.HSSFSheet.findLastRow(HSSFSheet.java:269) at org.apache.poi.hssf.usermodel.HSSFSheet.removeRow(HSSFSheet.java:243) the version is poi-3.1-FINAL.
Fixed in svn r675218