Smack XMPP Custom Extensions not arriving fully

Question

I've got Smack running with OpenFire. Message Transfer works fine, but custom extensions never arrive fully.

This is what get's sent (by a not-smack library):

<message type="normal" id="42444f16-761f-471d-a37c-c9204cf14cfc" to="timmy@openfireserver.eu">
  <operation xmlns="http://www.openfireserver.eu/ns/xmpp-rest" ack="false">PUT</operation>
  <part xmlns="http://www.openfireserver.eu/ns/xmpp-rest" RIDDL-TYPE="simple" content-disposition="riddl-data; name=&quot;value&quot;">stopped</part>
  <part xmlns="http://www.openfireserver.eu/ns/xmpp-rest" RIDDL-TYPE="simple" content-disposition="riddl-data; name=&quot;tims&quot;">world</part>
  <part xmlns="http://www.openfireserver.eu/ns/xmpp-rest" RIDDL-TYPE="complex" content-disposition="riddl-data; name=&quot;excellent&quot;" content-transfer-encoding="binary" content-type="text/plain">party time</part>
</message>

This is what arrives:

<message id="42444f16-761f-471d-a37c-c9204cf14cfc" to="timmy@openfireserver.eu" from="jürgen@openfireserver.eu/f8c64ccb">
<operation xmlns="http://www.openfireserver.eu/ns/xmpp-rest"></operation>
<part xmlns="http://www.openfireserver.eu/ns/xmpp-rest"></part>
<part xmlns="http://www.openfireserver.eu/ns/xmpp-rest"></part>
<part xmlns="http://www.openfireserver.eu/ns/xmpp-rest"></part>
</message>

I tried creating an OperationExtension and setting it before the connection is created like this:

OperationProvider o = new OperationProvider();
ProviderManager.getInstance().addExtensionProvider(o.getExtension().getElementName(),o.getExtension().getNamespace(), o);

The OperationProvider looks like this for testing, but my breakpoints never get hit :-(

public class OperationProvider implements PacketExtensionProvider {

    private OperationExtension extension = new OperationExtension();

    @Override
    public PacketExtension parseExtension(XmlPullParser xmlparser) throws Exception {
        OperationExtension o = new OperationExtension();
        System.out.println("YAAAA + " + xmlparser.getText());
        String text = xmlparser.nextText();
        while (text != null)
        {
            System.out.println("YAAAA + " + text);
            text = xmlparser.nextText();
        }
        return o;
    }

    public OperationExtension getExtension() {
        return extension;
    }

    public void setExtension(OperationExtension extension) {
        this.extension = extension;
    }

}

The OperationExtension itself is pretty basic (set breakpoints here to hopefully have them hit sometimes, but doesn't work):

public class OperationExtension implements PacketExtension {

    public static final String NAMESPACE = "http://www.openfireserver.eu/ns/xmpp-rest";

    public String getElementName()
    {
        return "Operation"; // <-- here was my error, it should say (lower-case) "operation"
    }

    public String getNamespace()
    {
        return NAMESPACE;
    }

    @Override
    public String toXML() {
        return "<Operation>GET</Operation>"; // this is also just mockup with a breakpoint ;-)
    }

}

, but the toXml() method also doesn't get called. As some of the few available docs suggest, I put a smack.properties file in a META-INF folder inside the /src path of the project, and I made it look like this:

<?xml version="1.0"?>
<extensionProvider>
      <elementName>operation</elementName>
      <namespace>http://www.openfireserver.eu/ns/xmpp-rest</namespace>
      <className>adventure.messagerouting.XmppExtensions.OperationExtension</className>
   </extensionProvider>
   <extensionProvider>
       <elementName>part</elementName>
       <namespace>http://www.openfireserver.eu/ns/xmpp-rest</namespace>
       <className>adventure.messagerouting.XmppExtensions.PartExtension</className>
</extensionProvider>

I can that my Provider is registered in ProviderManager.getInstance().getExtensionProviders(); but I cannot say why it's code is never called.

1. Do I do something wrong here? Why do my attributes and tag contents not arrive in smack?
2. Is it possible that OpenFire filters something out?

Answer 1

In short, it was a uppercase-lowercase typo in a String, Robin helped me find it by asking for details in a comment, and the code above works. Thanks Robin!

Answer 2

I think you could also use PacketExtension to extend your custom message packet.

Message message = new Message();
DefaultPacketExtension yourExt = new DefaultPacketExtension("your_ext", "com:your:ext:namespace");
yourExt.setValue("<XML element name>", <XML element value>);
messgae.addExtension(yourExt);