java.io.IOException: mark/reset not supported

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The documentation for AudioSystem.getAudioInputStream(InputStream) says:

The implementation of this method may
require multiple parsers to examine
the stream to determine whether they
support it. These parsers must be able
to mark the stream, read enough data
to determine whether they support the
stream, and, if not, reset the
stream’s read pointer to its original
position. If the input stream does not
support these operation, this method
may fail with an IOException.

Therefore, the stream you provide to this method must support the optional mark/reset functionality. Decorate your resource stream with a BufferedInputStream.

//read audio data from whatever source (file/classloader/etc.)
InputStream audioSrc = getClass().getResourceAsStream("mySound.au");
//add buffer for mark/reset support
InputStream bufferedIn = new BufferedInputStream(audioSrc);
AudioInputStream audioStream = AudioSystem.getAudioInputStream(bufferedIn);

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