for JSPWiki v2.10.1+
PlantUml v1.2023.1

1. download the jar into ${JSPWIKI_HOME}/WEB-INF/lib/

wget "https://github.com/pmamico/jspwiki-plantuml/blob/master/bin/PlantUmlPlugin-1.2.jar?raw=true" -O plantuml-plugin.jar

2. edit the comma-delimited jspwiki.plugin.searchPath in ${JSPWIKI_HOME}/WEB-INF/jspwiki-custom.properties to include the package designation of the plugin

jspwiki.plugin.searchPath = hu.pmamico.jspwiki.plugin

3. restart JSPWiki (or restart Tomcat)

mvn clean compile assembly:single antrun:run