Thanks for this great addon!
It doesn’t work 100% for me though.
I’m running Vaadin 14 and exporting to .xls works, but exporting to .xlsx does not. I get the following error:
java.lang.NoSuchMethodError: org.apache.xmlbeans.XmlOptions.setEntityExpansionLimit(I)Lorg/apache/xmlbeans/XmlOptions;
Fortunately exporting to .xls is good enough for me. :)