RFR: 8282463: javax/sound/sampled/Clip/DataPusherThreadCheck.java fails

[Andrey Turbanov]

On Sat, 15 Oct 2022 13:03:26 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Test failed on Ubuntu, because both implementations of `MixerProvider` have no devices:
> 1. com.sun.media.sound.DirectAudioDeviceProvider#nGetNumDevices returns `0`
>  ![DirectAudioDeviceProvider init](https://user-images.githubusercontent.com/741251/195988216-aa86da0f-739b-433f-87e2-86c2d6904a0d.png)
> 2. com.sun.media.sound.PortMixerProvider#nGetNumDevices returns `0`
>  ![PortMixerProvider init](https://user-images.githubusercontent.com/741251/195988239-59678e0c-be7b-43ff-b02a-9abb2392e8f9.png)
> 
> 
> It leads to `javax.sound.sampled.spi.MixerProvider#getMixerInfo` returns empty array.
> ![AudioSystem getMixedInfoList](https://user-images.githubusercontent.com/741251/195988266-1656e6d3-de4a-4e53-a613-415f60075726.png)
> 
> And DataPusher thread is not created, because of AudioSystem.isLineSupported returns false in the method `com.sun.media.sound.JavaSoundAudioClip#createSourceDataLine`.
> I propose to perform the same check in test code and skip it.

I wasn't able to reproduce failure after the fix.

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PR: https://git.openjdk.org/jdk/pull/10717