Hmm, so if I run that coursier command outside Pants:

cs  fetch -r=<https://repo.osgeo.org/repository/release> -r=<https://maven-central.storage-download.googleapis.com/maven2> -r=<https://repo1.maven.org/maven2> --no-default --json-output-file=coursier_report.json org.geotools:gt-main:9.2 com.google.geometry:s2-geometry:2.0.0 com.twitter:util-logging_2.11:20.1.0 org.mongodb:bson:3.11.2 joda-time:joda-time:2.10.3 com.fasterxml.jackson.core:jackson-core:2.6.7 com.twitter:util-core_2.11:20.1.0 com.fasterxml.jackson.core:jackson-databind:2.6.7 com.vividsolutions:jts:1.12 com.fasterxml.jackson.module:jackson-module-scala_2.11:2.6.7.1 org.apache.thrift:libthrift:0.9.0 org.codehaus.jackson:jackson-core-asl:1.9.8

It works fine.