Why do you test for open?

[HelgeStenstrom]

java-stream-player/src/main/java/com/goxr3plus/streamplayer/stream/StreamPlayer.java

Line 529 in 4991e4a

if (sourceDataLine.isOpen()) {

On the line above the test, you just opened the sourceDataLine. Don't you trust that it worked?
If it didn't work, if the line wasn't opened, isn't that a reason to throw an exception, rather than silently ignore the failure?

[goxr3plus]

Yep let's combine it with #36 and code a solution :)