Github user rvesse commented on the issue:
https://github.com/apache/jena/pull/474
@afs For some projects where I have added JDK 9/10 support I have had to
create separate profiles activated by JDK version for the Javadoc plugin
because there are breaking changes between the plugin versions and supported
flags for the underlying `javadoc` tool
Also if you have updated the Javadoc plugin version to a 3.x release then
you need to add an `<option>` sub-element within `<additionalOptions>` rather
than just specifying the options directly
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