Cannot obtain Transmitter from virtual MIDI device

Hi all,
working on Linux, I'd love to be able to process MIDI events generated by some other program (say, the Rosegarden sequencer) from within a Java application. Rosegarden itself doesn't show up in the list of devices detected by MidiSystem.getMidiDeviceInfo(); however,
I figured out that the snd-virmidi kernel module might be the way to go. And indeed, after loading it, I get some new ALSA raw midi devices:
Port     Client name                       Port name
14:0     Midi Through                      Midi Through Port-0
16:0     SBLive! Value [CT4830]            EMU10K1 MPU-401 (UART)
17:0     Emu10k1 WaveTable                 Emu10k1 Port 0
17:1     Emu10k1 WaveTable                 Emu10k1 Port 1
17:2     Emu10k1 WaveTable                 Emu10k1 Port 2
17:3     Emu10k1 WaveTable                 Emu10k1 Port 3
20:0     Virtual Raw MIDI 1-0              VirMIDI 1-0
21:0     Virtual Raw MIDI 1-1              VirMIDI 1-1
22:0     Virtual Raw MIDI 1-2              VirMIDI 1-2
23:0     Virtual Raw MIDI 1-3              VirMIDI 1-3
128:0     rosegarden                        record in
128:2     rosegarden                        external controllerEach of the virtual midi devices now nicely shows up in Java's device list -- actually, each of these virtual ALSA devices seem to be represented by 16 different Java MidiDevices (does anyone know why?). All these devices report -1 as their maximum transmitter count (which, I understand, indicates an infinite number of transmitters) -- but whenever I try to obtain a Transmitter object by calling getTransmiiter() on one of the devices, all I get is an exception like the following one:
javax.sound.midi.MidiUnavailableException: MIDI OUT transmitter not available
     at com.sun.media.sound.AbstractMidiDevice.createTransmitter(AbstractMidiDevice.java:444)
     at com.sun.media.sound.AbstractMidiDevice.getTransmitter(AbstractMidiDevice.java:299)
     at de.tcrass.midicast.MidiCastServer.<init>(MidiCastServer.java:63)
     at de.tcrass.midicast.MidiCast.main(MidiCast.java:8)Any idea why those devices won't give me any transmitters?
Regards --
tcrass

Captfoss,
>
Which does not necessarily mean that Java has the necessary permissions to access these virtual devices...
>
it doesn't make any difference whether I call my test program as myself or (via sudo) as root -- I consistently get the "MIDI OUT transmitter not available" exception. The kernel (and hence: ALSA) version doesn't have any influence, either (2.6.24 vs. 2.6.26).
Do you (or anyone else) have any clue where else in 'the longest text adventure ever' (as some people have called Linux ;-) something might have to get adjusted to grant a Java program permission to obtain a Transmitter? As I said, the value of -1 returned by getMaxTransmitters() suggests that there shouldn't be a shortage of Transmitters... (Or should I file this behaviour as a bug?)
Regards, and a good start into 2009 --
tcrass

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