How to write java.util.Properties to XML with sorted keys?

String propFile = "/path/to/file";
Properties props = new Properties();
/*set some properties here*/
try {
    FileOutputStream xmlStream = new FileOutputStream(propFile);
    /*this comes out unsorted*/
    props.storeToXML(xmlStream,"");
} catch (IOException e) {
    e.printStackTrace();
}

String propFile = "/path/to/file";
Properties props = new Properties();
/*set some properties here*/
Properties tmp = new Properties() {

  @Override
  public Set<Object> keySet()
  {
    return Collections.unmodifiableSet(new TreeSet<Object>(super.keySet()));
  }

};
tmp.putAll(props);
try {
    FileOutputStream xmlStream = new FileOutputStream(propFile);
    /*this comes out SORTED! */
    tmp.storeToXML(xmlStream,"");
} catch (IOException e) {
    e.printStackTrace();
}

public static void main(String[] args){
    	String propFile = "/tmp/test2.xml";
    	Properties props = new Properties();
    	props.setProperty("key", "value");
    	props.setProperty("key1", "value1");
    	props.setProperty("key2", "value2");
    	props.setProperty("key3", "value3");
    	props.setProperty("key4", "value4");

    	try {
    	    BufferedWriter out = new BufferedWriter(new FileWriter(propFile));
    	    List<String> list = new ArrayList<String>();
    	    for(Object o : props.keySet()){
    	    	list.add((String)o);
    	    }
    	    Collections.sort(list);
    	    out.write("<?xml version="1.0" encoding="UTF-8"?>n");
    	    out.write("<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">n");
    	    out.write("<properties>n");
    	    out.write("<comment/>n");
    	    for(String s : list){
    	    	out.write("<entry key="" + s + "">" + props.getProperty(s) + "</entry>n");
    	    }
    	    out.write("</properties>n");
    	    out.flush();
    	    out.close();
    	} catch (IOException e) {
    	    e.printStackTrace();
    	}
    }

Properties props = new Properties() {
    @Override
    public Set<Object> keySet(){
        return Collections.unmodifiableSet(new TreeSet<Object>(super.keySet()));
    }

    @Override
    public synchronized Enumeration<Object> keys() {
        return Collections.enumeration(new TreeSet<Object>(super.keySet()));
    }
};
props.put("B", "Should come second");
props.put("A", "Should come first");
props.storeToXML(new FileOutputStream(new File("sortedProps.xml")), null);
props.store(new FileOutputStream(new File("sortedProps.properties")), null);

new Properties() {
    @Override Set<Object> keySet() {
        return new TreeSet<Object>(super.keySet());
    }
}

Set keys = props.keySet();
Iterator i = keys.iterator();

Set keys = props.keySet();
List<String> newKeys = new ArrayList<String>();
for(Object key : keys)
{
   newKeys.add(key.toString());
}
Collections.sort(newKeys);
Iterator i = newKeys.iterator();