JavaXPCOM and nsIAlertsService

Hi all,

I'm trying to get my first application with JavaXPCOM running, and I'm 
probably doing something very wrong. I wanted to take advantage of the 
nsIAlertsService which I've used successfully from with Firefox 
extensions and display a similar alert from within my Java app.

This uses xulrunner 1.8.0.1, Java 1.5.0.07. I get the following error 
when running it:

Exception in thread "main" org.mozilla.xpcom.XPCOMException: The 
function "showAlertNotification" returned an error condition  (0x80004005)
         at 
org.mozilla.xpcom.internal.XPCOMJavaProxy.callXPCOMMethod(Native Method)
         at 
org.mozilla.xpcom.internal.XPCOMJavaProxy.invoke(XPCOMJavaProxy.java:140)
         at $Proxy1.showAlertNotification(Unknown Source)
         at TestAlert.main(TestAlert.java:13)


The Java code is below. Where did I go wrong?

Thanks!

--------->8----------
import org.mozilla.xpcom.*;
import java.io.*;

public class TestAlert {
     public static void main(String[] args) throws Exception {
         Mozilla mozilla = Mozilla.getInstance();
         File here = new java.io.File(new 
java.io.File("").getAbsolutePath());
         LocationProvider l = new LocationProvider(here);
         mozilla.initEmbedding(here, here, l);

         nsIServiceManager sm = mozilla.getServiceManager();
         nsIAlertsService alertService = 
(nsIAlertsService)sm.getServiceByContractID("@mozilla.org/alerts-service;1", 
nsIAlertsService.NS_IALERTSSERVICE_IID);
         alertService.showAlertNotification("", "Title", "Text", false, 
"", null);
     }

}

class LocationProvider implements IAppFileLocProvider {
     File libXULPath;

     public LocationProvider(File aBinPath) throws FileNotFoundException {
         libXULPath = aBinPath;
         if (!libXULPath.exists() || !libXULPath.isDirectory())
             throw new FileNotFoundException("libxul directory specified 
is not valid: "
                                             + 
libXULPath.getAbsolutePath());
     }

     public File getFile(String aProp, boolean[] aPersistent) {
         File file = null;
         if (aProp.equals("GreD") || aProp.equals("GreComsD")) {
             file = libXULPath;
             if (aProp.equals("GreComsD")) {
                 file = new File(file, "components");
             }
         }
         else if (aProp.equals("MozBinD") ||
                  aProp.equals("CurProcD") ||
                  aProp.equals("ComsD") ||
                  aProp.equals("ProfD"))
             {
                 file = libXULPath;
                 if (aProp.equals("ComsD")) {
                     file = new File(file, "components");
                 }
             }
         return file;
     }

     public File[] getFiles(String aProp) {
         File[] files = null;
         if (aProp.equals("APluginsDL")) {
             files = new File[1];
             files[0] = new File(libXULPath, "plugins");
         }
         return files;
     }
}