Gradle problems when building adql-java package

[Ole Streicher <olebole@debian.org>]

Hi,

I am trying to update the adql-java package to the newest upstream
(beta) version. As it is my first project using gradle, I sumbled upon a
number of problems:

One is that the plugin org.javacc.javacc is not available. I guess this
is because it is not packaged yet, right? My solution here is that I
call javacc in d/rules before running dh_auto_build; is this the way to
go?

After this, dh_auto_build completes, but the tests fail with

    > Could not resolve junit:junit:4.13.1.
      Required by:
          project :ADQLLib
       > No cached version of junit:junit:4.13.1 available for offline mode.

which is caused by

    dependencies {
        testImplementation 'junit:junit:4.13.1'
        testImplementation 'org.slf4j:slf4j-simple:1.7.25'
    }

in the main build.gradle (right?) junit4 is however a build dependency
(currently 4.13.2 in unstable). What should I do here? Are the versions
here minversions? Removing the complete dependency will cause junit4
classes missing in the test, also setting the CLASSPATH environment
variable doesn't help. What is the proper solution here?

Best

Ole