problem can be seen at https://travis-ci.org/sevntu-checkstyle/methods-distance/builds/644597932#L1906
Could not transfer artifact com.puppycrawl.tools:checkstyle:pom:8.29 from/to
central (http://repo.maven.apache.org/maven2): Failed to transfer file:
http://repo.maven.apache.org/maven2/com/puppycrawl/tools/checkstyle/8.29/
checkstyle-8.29.pom. Return code is: 501 , ReasonPhrase:HTTPS Required. -> [Help 1]
same build logs but a bit above for deploy phase:
-----> Java app detected
-----> Installing JDK 1.8... done
-----> Installing Maven 3.1.1... done
-----> Executing Maven
$ mvn -Pheroku clean dependency:list install
during build there is different maven:
mvn version
Apache Maven 3.6.2 (40f52333136460af0dc0d7232c0dc0bcf0d9e117; 2019-08-27T15:06:16Z)
Possbily maven update should help - https://stackoverflow.com/a/59764670/1015848