Fix class cast exception with DirectoryEntry#getOrderingProperty

An exception occured while executing the Java class. class java.lang.Integer cannot be cast to class java.lang.Long (java.lang.Integer and java.lang.Long are in module java.base of loader 'bootstrap')

        DirectoryManager manager = client.directoryManager();
        Directory directory = manager.directory("nature");
        DirectoryEntry e = directory.fetchEntry("application");
        Long l = e.getOrderingProperty();