Java 1.5 problem with Mixer.getMaxLines

Question

This worked in Java 1.4 (returning 32),
in Java 1.5 it returns -1
wha' happened?
DataLine.Info lineInfo = new DataLine.Info(SourceDataLine.class, playbackFormat);
Mixer mixer = AudioSystem.getMixer(null);
return mixer.getMaxLines(lineInfo);
Note: playbackFormat has the toString() value of: format = PCM_SIGNED 44100.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian
Please help, I used to have simultaneous sounds playing in my game now nothing and everything else seems fine in 1.5. I don't want to go back to 1.4...

Answer 1

I've got a solution found over on javagaming.org. It turns out that Java 1.4 was using a software mixer by default. So I changed my code to force it the mixer to be softwared.
This code creates a software mixer:
static Mixer mixer = null;
Mixer.Info[] mixers = AudioSystem.getMixerInfo();
for (int i = 0; i < mixers.length; i++) {
if ("Java Sound Audio Engine".equals(mixers.getName())) {
mixer = AudioSystem.getMixer(mixers);
This code now returns 32, which is what it did in Java 1.4 (instead of -1)
DataLine.Info lineInfo = new DataLine.Info(SourceDataLine.class, playbackFormat);
return mixer.getMaxLines(lineInfo);
This code now used to get a line
line = (SourceDataLine) mixer.getLine(lineInfo);
instead of
line = (SourceDataLine) AudioSystem.getLine(lineInfo);