No output, no diagnostics

[mernst]

The following set of commands complete with "BUILD SUCCESSFUL" and exit status 0, but the output directory is not created:

cd /tmp
rm -rf target-system specimin

git clone https://github.com/skehrli/checker-framework --branch rlc-collections-redesign target-system
(cd target-system && ./gradlew -q assembleForJavac)

git clone https://github.com/njit-jerse/specimin
cd specimin
./gradlew run --args="--root=/tmp/target-system --targetFile=annotation-file-utilities/src/main/java/org/checkerframework/afu/scenelib/io/ASTIndex.java --outputDirectory=/tmp/specimin-out --jarPath=/tmp/target-system/checker/build/libs"