MidiSystem.getSequencer() generates exception with obscure message

Name: izR10247 Date: 11/18/2003



Java Sound spec states for method MidiSystem.getSequencer():
"Obtains the default Sequencer, connected to a default device.
The returned Sequencer instance is connected to the default Synthesizer,
as returned by getSynthesizer(). If there is no Synthesizer available, or
the default Synthesizer cannot be opened, the sequencer is connected to
the default Receiver, as returned by getReceiver()
...
Throws:
         MidiUnavailableException - if the sequencer is not available
         due to resource restrictions, or there is no Receiver
         available by any installed MidiDevice, or no sequencer is
         installed in the system."

But J2SE 1.5 b28 implementation does not return Sequencer connected to the
default Synthesizer and throws exception with obscure message:
"MIDI OUT transmitter not available". Note that default Secuencer is
available
as well as Synthesizer respectively and this could mislead the users since
MidiUnavailableException might be really thrown in case of resource
restrictions.

To reproduce this problem please
run test 'MyTest' using script 'MyTest.sh' below,
note that this problem is not reproducible
on windows platform:

=============== MyTest.java source begin ===============
import javax.sound.midi.*;
import javax.sound.sampled.AudioPermission;

public class MyTest {

    public static void main(String argv[]) {

        Sequencer seq = null;
        MidiDevice.Info[] infos;
        try {
            infos = MidiSystem.getMidiDeviceInfo();
            System.out.println("Here is list of our MidiDevices:");
            for(int i=0;i<infos.length;i++) {
                System.out.println("== Device #" + i + "==");
                System.out.println("Vendor:\t\t\t" + infos[i].getVendor());
                System.out.println("Description:\t\t" + infos[i].getDescription());
                System.out.println("Version:\t\t" + infos[i].getVersion());
                System.out.println("Name:\t\t\t" + infos[i].getName());
                if(MidiSystem.getMidiDevice(infos[i]) instanceof Sequencer) {
                    System.out.println("*** We found that this is sequencer: ***\n\t"
                        + MidiSystem.getMidiDevice(infos[i]).getClass().getName());
                } else {
                    if(MidiSystem.getMidiDevice(infos[i]) instanceof Synthesizer) {
                        System.out.println("*** We found that this is synthesizer: ***\n\t"
                            + MidiSystem.getMidiDevice(infos[i]).getClass().getName());

                    }
                }
                System.out.println("\n");
            }
            System.out.println("Now we are trying to get default sequencer:");
            seq = MidiSystem.getSequencer();
            System.out.println("Default sequencer is:" + seq);
        } catch (MidiUnavailableException mue) {
            System.out.println("We've tried to get default sequencer but following exception was thrown:");
            System.out.println("MidiUnavailableException was thrown: " + mue);
            mue.printStackTrace();
        }
    }
}
=============== MyTest.java source end =================
=============== MyTest.sh begin ========================
#!/bin/bash
export JDK='/net/linux-15/export/home/java/jdk1.5.0/sparc'
# Generating info about operating system
uname -a
# Source compilation
$JDK/bin/javac MyTest.java
# Test running
$JDK/bin/java -showversion MyTest
=============== MyTest.sh end ==========================
=============== MyTest output begin ====================
bash-2.05$ ./MyTest.sh
SunOS novo48 5.9 Generic_112233-07 sun4u sparc SUNW,Ultra-60
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b28)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b28, mixed mode)

Here is list of our MidiDevices:
== Device #0==
Vendor: Sun Microsystems
Software sequencer / synthesizer module
Version: Version 1.0
Name: Java Sound Sequencer
*** We found that this is sequencer: ***
        com.sun.media.sound.MixerSequencer


== Device #1==
Vendor: Sun Microsystems
Software sequencer
Version: Version 1.0
Name: Real Time Sequencer
*** We found that this is sequencer: ***
        com.sun.media.sound.RealTimeSequencer


== Device #2==
Vendor: Sun Microsystems
Software wavetable synthesizer and receiver
Version: Version 1.0
Name: Java Sound Synthesizer
*** We found that this is synthesizer: ***
        com.sun.media.sound.MixerSynth


Now we are trying to get default sequencer:
We've tried to get default sequencer but following exception was thrown:
MidiUnavailableException was thrown:
javax.sound.midi.MidiUnavailableException: MIDI OUT transmitter not available
javax.sound.midi.MidiUnavailableException: MIDI OUT transmitter not available
        at com.sun.media.sound.AbstractMidiDevice.createTransmitter(AbstractMidiDevice.java:410)
        at com.sun.media.sound.AbstractMidiDevice.getTransmitter(AbstractMidiDevice.java:281)
        at javax.sound.midi.MidiSystem.getSequencer(MidiSystem.java:438)
        at javax.sound.midi.MidiSystem.getSequencer(MidiSystem.java:348)
        at MyTest.main(MyTest.java:32)
=============== MyTest output end ======================
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Name: izR10247 Date: 11/24/2003


Yes. Your evaluation is right. Bug is reproducible
with old (not jdk1.5.0) rt.jar classpath only.
So, please feel free to close the bug as not a bug.




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###@###.### 2003-11-24