Comment by nabbed

Way, way back in 2003 or thereabouts, I had to add an "open this report in Excel" function to an existing product. But first I had to figure out how to convert the report to Excel format (with freeze panes, etc.). I found Apache POI and was very happy with its API documentation, especially this "Busy Developers' Guide to Features": https://poi.apache.org/components/spreadsheet/quick-guide.ht...

This page was much simpler 22 years ago (I don't remember this HSSF stuff, whatever that is), but it still looks familiar. Basically everything I needed to do had examples in there. I remember thinking that the authors cared about the users of the library (although the Javadoc seems a little bare.. but I am not sure I needed the Javadoc much).

If I ever create an OSS library, I would certainly also create a "Busy Developers' Guide".