i've encountered a problem in numerous of our Maven builds at wcm.io [1] which 
started failing yesterday when GitHub switched to latest Maven 3.8.2 release 
for their images.

an example is described in [2], build log [3], to sum it up:
- build fails in when generating the maven site during the javadoc step, which 
is unable to find a couple of dependencies which are defined correctly (they 
are defined as "provided" in the <dependency> section of one of the parent POMs)
- the build does not fail when "javadoc:javadoc" is executed directly, only as 
part of the "site" goal
- everything runs fine with Maven 3.8.1 or 3.6.3

i'm not sure if this is an issue in either site mojo or javadoc mojo or Maven 
itself. the release notes [4] contain a pointer to a change around MNG-6843, 
but i'm not aware that site or javadoc plugin are spwaning new threads.

any ideas about the root cause?

stefan

[1] https://github.com/wcm-io
[2] https://wcm-io.atlassian.net/browse/WTOOL-78
[3] 
https://github.com/wcm-io/wcm-io-wcm-core-components/runs/3505611228?check_suite_focus=true
[4] https://maven.apache.org/docs/3.8.2/release-notes.html

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