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copied!<p>I havent done any iTunes stuff in Java for a while, but from what experience I have I remember that the interface can be rather fickle. </p> <p>I don't have any definitive answer, but in attempt to provide at least a shot in the dark, maybe you should try casting the ITPlaylist you're working with to an ITUserPlaylist (if that's the correct type, of course) and then calling <em>its</em> addTrack method. That way you'd be using the function provided by the library, and if that doesn't work you can get in touch with the developer because there may be a more serious problem occurring.</p> <p>From the dump you provided, it looks as though the underlying C in JACOB is trying to modify the equivalent ITPlaylist via the iTunes COM interface. This could be because of the way the inheritance is working? IE: ITPlaylist doesn't support addTrack (the underlying C is trying to call a nonexistent function) but ITUserPlaylist does? Just a thought.</p> <p>Suggested correction:</p> <pre><code>public void addTrack(ITTrack track) { ITPlaylistKind k = getKind(); if (k == ITPlaylistKindUser) { Dispatch.put( ((ITUserPlaylist)this).object, "AddTrack", track); } else throw new UnsupportedOperationException("can only add track to user playlists - kind : " + k); } </code></pre> <p>Again I'm certainly not the expert here so if anyone has any better ideas, please go ahead and post over me :)</p> <p>Let me know if that offers you any success!</p> <p><strong>Edit</strong> After re-reading my post, I realized I forgot this approach, which could arguably be better as it keeps the JACOB COM bridge out of the higher level stuff:</p> <pre><code>((ITUserPlaylist)this).addTrack(track); </code></pre>

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