Name: dkR10031 Date: 11/27/2002


 
After AudioSystem.getMixerInfo() method invocation, a thread which waits
for notification does not allow to complete class execution.
The JDK 2 SE 1.4 API specification does not state what should
notify the thread created or used by AudioSystem.getMixerInfo():

  "getMixerInfo
 
  public static Mixer.Info[] getMixerInfo()
 
      Obtains an array of mixer info objects that represents the set of
  audio mixers that are currently installed on the system.
 
  Returns:
  an array of info objects for the currently installed mixers. If no mixers
  are available on the system, an array of length 0 is returned."
 
The bug is found in JDK build 1.4.2-beta-b07, and reproduced with
JDK 1.3.0, JDK 1.3.1, JDK 1.4.0, JDK 1.4.1 and all JDK 1.4.2-beta builds.
To reproduce the bug run the following test with JDK build 1.4.2-beta-b07,
wait for 3 minutes and press ctrl+\:
------------------------------------------------------------------------
import javax.sound.sampled.*;
public class MyMusic{
    public static void main(String args[]){
        System.out.println("We are trying to get informations:");
        Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
        System.out.println("The movie is over! Where is exit?");
    }
}
-----------------------------Logs---------------------------------------
We are trying to get informations:
The movie is over! Where is exit?
Full thread dump Java HotSpot(TM) Client VM (1.4.2-beta-b07 mixed mode):

"DestroyJavaVM" prio=1 tid=0x08052f50 nid=0x5246 waiting on condition
[0..bfffd4
7c]

"Java Sound event dispatcher" prio=1 tid=0x0810c188 nid=0x524f in
Object.wait()
[4cf22000..4cf228b8]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x446c2e70> (a com.sun.media.sound.EventDispatcher)
        at java.lang.Object.wait(Object.java:426)
        at
com.sun.media.sound.EventDispatcher.dispatchEvents(EventDispatcher.ja
va:292)
        - locked <0x446c2e70> (a com.sun.media.sound.EventDispatcher)
        at
com.sun.media.sound.EventDispatcher.run(EventDispatcher.java:343)
        at java.lang.Thread.run(Thread.java:536)

"Signal Dispatcher" daemon prio=1 tid=0x0809ffe0 nid=0x524c waiting on
condition
 [0..0]

"Finalizer" daemon prio=1 tid=0x0808b310 nid=0x524a in Object.wait()
[4c874000..
4c8748b8]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x44690490> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
        - locked <0x44690490> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=1 tid=0x0808a6c0 nid=0x5249 in
Object.wait() [4c
7f3000..4c7f38b8]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x44690380> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:426)
        at
java.lang.ref.Reference$ReferenceHandler.run(Reference.java:113)
        - locked <0x44690380> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=1 tid=0x080874a0 nid=0x5248 runnable

"VM Periodic Task Thread" prio=1 tid=0x080a26f8 nid=0x524e waiting on
condition
"Suspend Checker Thread" prio=1 tid=0x0809f5f8 nid=0x524b runnable
-------------------------------------------------------------------------

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