I need to add the apache poi to my project (I need hssf, ss and xssf). I downloaded a jar file from the internet but it does not contain xssf. I went to http://poi.apache.org/ a
Download The latest stable release: Apache POI 3.16-FINAL distribution,
open your eclipse project properties,
Java Built Path > Libraries > Add external JARs,
then extract the zip file you downloaded and navigate the extracted folder,
select all the JARs under the sub folders (docs, lib, ooxml-lib),
then finally in the Order and Export section put marks to jar libs you just added,
and click OK.