Issue #163: Handle objects in 'appendOne' method when creating return values for list of objects

Author: hypfvieh

dbus-java-core/src/main/java/org/freedesktop/dbus/messages/Message.java

@@ -20,6 +20,7 @@
 import org.freedesktop.dbus.exceptions.DBusException;
 import org.freedesktop.dbus.exceptions.MarshallingException;
 import org.freedesktop.dbus.exceptions.UnknownTypeCodeException;
+import org.freedesktop.dbus.interfaces.DBusInterface;
 import org.freedesktop.dbus.types.UInt16;
 import org.freedesktop.dbus.types.UInt32;
 import org.freedesktop.dbus.types.UInt64;
@@ -530,9 +531,17 @@ private int appendOne(byte[] _sigb, int _sigofs, Object _data) throws DBusExcept
                 break;
             case ArgumentType.STRING:
             case ArgumentType.OBJECT_PATH:
-                // Strings are marshalled as a UInt32 with the length,
-                // followed by the String, followed by a null byte.
-                String payload = _data.toString();
+                
+                String payload;
+                // if the given data is an object, not a ObjectPath itself
+                if (_data instanceof DBusInterface) {
+                    payload = ((DBusInterface) _data).getObjectPath();
+                } else {
+                    // Strings are marshalled as a UInt32 with the length,
+                    // followed by the String, followed by a null byte.
+                    payload = _data.toString();
+                }
+                
                 byte[] payloadbytes = null;
                 try {
                     payloadbytes = payload.getBytes("UTF-8");
@@ -1421,4 +1430,4 @@ public interface Endian {
         byte BIG    = 'B';
         byte LITTLE = 'l';
     }
-}
+}