public static AudioData getPlaceholderAudio(){
        AudioBuffer audioBuf = new AudioBuffer();
        audioBuf.setupFormat(1, 8, 44100);
        ByteBuffer bb = BufferUtils.createByteBuffer(1);
        bb.put((byte)0).flip();
        audioBuf.updateData(bb);
        return audioBuf;
    }
A private constructor to inhibit instantiation of this class.
jme3-core/src/main/java/com/jme3/util/PlaceholderAssets.java