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I have a treeTable and I need to export to excel. I read about p:dataExporter.

Can I use dataExporter for treeTable?.

How can I export a p:treeTable to excel?

In PrimeFaces extensions it is called pe:exporter. In PrimeFaces itself it is a p:dataExporter. So you use the wrong combination of namespace(-prefix) and tag name by using pe:dataExporter

I don't understand the difference between pe:exporter and p:dataExporter

The difference is the same as between an h:datatable and a p:datatable. Completely different components.

Thanks a lot.

One question more. What component do I have to use to export to excel a datatable and a treetable?

No idea for treetable but for the datatable it is either the PrimeFaces or PrimeFaces extensions exporter

I have found this interesting project takes a look.

https://github.com/rdicroce/jsfexporter

May help you