XMLDecoder\Encoder сериализовать объекты коллекции

public class Serializer {
 
    public Serializer() {
    }
 
    public void serializeCollectionToXML(String xmlFileLocation, Collection collection) throws FileNotFoundException {
        FileOutputStream os = new FileOutputStream(xmlFileLocation);
        XMLEncoder encoder = new XMLEncoder(os);
        for(Object object : collection)
        {
            encoder.writeObject(object);
        }
        encoder.close();
    }
 
    public ArrayList<Object> deserializeCollectionFromXML(String xmlFileLocation) throws IOException {
        ArrayList<Object> collection = new ArrayList<Object>();
        FileInputStream os = new FileInputStream(xmlFileLocation);
        XMLDecoder decoder = new XMLDecoder(os);
        while(os.read() != -1)
        {
            collection.add(decoder.readObject());
        }
        decoder.close();
        return collection;
    }
}

serializer.serializeCollectionToXML(ResourcePath + "courses.xml", alc);//alc - заполненный ArrayList

ArrayList<Object> me = serializer.deserializeCollectionFromXML(ResourcePath + "courses.xml");

org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
Continuing ...
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
    at java.beans.XMLDecoder.readObject(XMLDecoder.java:238)
    at Utilities.Serializer.deserializeCollectionFromXML(Serializer.java:50)
    at ScheduleManager.Parser.parseData(Parser.java:103)
    at ScheduleManager.Main.main(Main.java:15)

collection.add(decoder.readObject());

public Object deserializeFromXML(String xmlFileLocation) throws FileNotFoundException {
        FileInputStream os = new FileInputStream(xmlFileLocation);
        XMLDecoder decoder = new XMLDecoder(os);
        Object deSerializedObject = decoder.readObject();
        decoder.close();
        return deSerializedObject;
    }