Bug#920747: dirgra FTBFS with recent OpenJDK

[Adrian Bunk]

Source: dirgra
Version: 0.3-1
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/dirgra.html

...
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:jar (default-cli) on project dirgra: MavenReportException: Error while generating Javadoc: 
[ERROR] Exit code: 1 - javadoc: error - The code being documented uses modules but the packages defined in https://docs.oracle.com/javase/6/docs/api/ are in the unnamed module.


For background see
https://bugs.debian.org/cgi-bin/bugreport.cgi?archive=no&bug=919798#125