@Override
    public File getFileReference(Path pathRelativeToAppDir) {
        Path path = Path.fromString(USERAPP_ZK_SUBPATH).append(pathRelativeToAppDir);

        // File does not exist: Manufacture a non-existing file
        if ( ! zkApplication.exists(path)) return new File(pathRelativeToAppDir.getRelative());

        return new File(zkApplication.getData(path));
    }
Returns readers for all the children of a node.
The node is looked up relative to the location of the active application package in zookeeper.
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationPackage.java