[JDK9] extensions - unammed package not allowed for module

jar -d --file=./modules/system/layers/base/org/aesh/main/aesh-extensions-1.1.jar
Unable to derive module descriptor for: ./modules/system/layers/base/org/aesh/main/aesh-extensions-1.1.jar
AeshExampleExtension.class found in top-level directory (unnamed package not allowed in module)