Need a serializer in xml files. I do not know which one to use. I need as simple as possible to work and not XStream.
In general, you will need to implement both class serialization and deserialization.
Different parsers are not needed - you need a ready serializer.
It is necessary that the serialization should be performed in such a way that the xml file contains something like this: http://www.solarix.ru/pix/faind/datamining/xml_file_example.gif
Accordingly, deserialization should work with the same file.