[Java] Xml-Daten-Schnittstelle zwischen Java und C# für HashMap "selber" serialisiern

    public static boolean Serialize(Object obj, String FilePath)
    {
        XMLEncoder enc = null;

        try
        {
            enc = new XMLEncoder( new FileOutputStream(FilePath) );
            enc.writeObject(obj);
            return true;
        }
        catch (Exception e)
        {
            return false;
        }
        finally
        {
            if (enc != null) enc.close();
        }
    }
    public static Object Deserialize(String FilePath)
    {
        XMLDecoder dec = null;

        try
        {
            dec = new XMLDecoder(new FileInputStream(FilePath));
            return dec.readObject();
        }
        catch (Exception e)
        {
            return null;
        }
        finally
        {
            if (dec != null) dec.close();
        }
    }

        HashMap<Integer, Rule> rules = new HashMap<>();
        
        rules.put(1, new Rule(1,1,"1"));
        rules.put(2, new Rule(2,1,"2"));
        rules.put(3, new Rule(3,1,"3"));
        
        Serialize(rules, "asdf.xml");

@XmlRootElement(name="Regel")
public class Rule
{
    private int ID;
    public int getID() { return this.ID; }
    
    private int Severity;
    public int getSeverity() { return this.Severity; }

    private String RuleText;
    public String getRuleText() { return this.RuleText; }
        
    public Rule() { }
    public Rule(int ID, String RuleText)
    {
        this(ID, 0, RuleText);
    }
    public Rule(int ID, int Severity, String RuleText)
    {
        this.ID = ID;
        this.Severity = Severity < 0 ? 0 : (Severity > 10 ? 10 : Severity);
        this.RuleText = RuleText;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<java version="1.7.0_21" class="java.beans.XMLDecoder">
 <object class="java.util.HashMap">
  <void method="put">
   <int>1</int>
   <object class="me.SirPalladin.PlayerData.Rule"/>
  </void>
  <void method="put">
   <int>2</int>
   <object class="me.SirPalladin.PlayerData.Rule"/>
  </void>
  <void method="put">
   <int>3</int>
   <object class="me.SirPalladin.PlayerData.Rule"/>
  </void>
 </object>
</java>

<?xml version="1.0"?>
<Regel-Sammlung>
  <Regel>
    <Nummer>
      <int>1</int>
    </Nummer>
    <Schwere>
      <int>1</int>
    </Schwere>
    <Text>
      <string>1</string>
    </Text>
  </Regel>
</Regel-Sammlung>