chkconfig does not work with Solr 8.1.1: No example/webapps/solr.war in the distribution

[sermo-de-arboribus]

The Solr distribution of version 8.1.1. that your documentation is linking to does not contain the folder ./example/webapps with the file solr.war. Therefore the chkconfig script cannot find it and fails with:

Solr was not correctly installed. Please make sure that the solr
installation is available in
'C:\xampp\htdocs\ojs-3.2.1\plugins\generic\lucene\lib\solr'.
The directory 'example\webapps' therein should contain the file
'solr.war'.
Please correct the errors and then re-run this script.

Some expectations of the start.bat script are also not met. Though it says Started Solr it does not do so and the Jetty log contains:

ERROR : Nothing to start, exiting ...

Usage: java -jar $JETTY_HOME/start.jar [options] [properties] [configs]
java -jar $JETTY_HOME/start.jar --help # for more information