After the upgrade of JPA (2.0 -> 2.1) and Hibernate (4.x -> 5.x), the jcr2vfs-importer tests started to fail with WELD-ENV-000015: Unable to load annotation: jsinterop.annotations.JsType. This class is in gwt-user jar, so adding that "fixes" the issue. However, gwt-user is a huge library (~16MiB) and ideally should not be needed. We need to investigate if there is a way to get rid of it.