I would expect that 

Maven.resolver().resolve("org.hibernate:hibernate-core:6.4.1.Final", "org.wicketstuff:javaee-inject-example-ejb:6.15.0").withoutTransitivity().asFile();

 returns both dependencies without any transitive ones. But it only returns one. The javadoc for the resolve states that the method "Begins resolution by defining a set of desired dependencies", but it seems that the MavenWorkingSessionImpl#resolveDependencies tries to resolve the dependencies as children and thus DefaultRepositorySystem#resolveDependencies returns only one dependency.