FULL PRODUCT VERSION :
java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Darwin mankell 13.4.0 Darwin Kernel Version 13.4.0: Sun Aug 17 19:50:11 PDT 2014; root:xnu-2422.115.4~1/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
AudioSystem is capable of reading floating point wave files. According to AudioFormat they have an encoding of PCM_FLOAT.

Via AudioSystem it is also possible to write those files, however, the result is garbage.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Write a PCM_FLOAT encoded file using AudioSystem.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The file should be encoded as PCM_FLOAT or AudioSystem should cry foul and not write it.
ACTUAL -
AudioSystem writes a file that it claims to be PCM_SIGNED, but that contains the float samples. In other words: claimed format in the header and actual sample format don't match.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import java.io.File;

import static javax.sound.sampled.AudioFileFormat.Type.WAVE;
import static javax.sound.sampled.AudioFormat.Encoding.PCM_FLOAT;

public class TestReadWrite32BitFloat {

    public static void main(String[] args) throws Exception {
        final File file = new File("test32BitFloat.wav"); // this must be PCM_FLOAT encoded
        // you can create one, e.g. with "sox test.wav -b 32 -e floating-point test32BitFloat.wav"
        final File out = new File("out32BitFloat.wav");
        AudioInputStream in = AudioSystem.getAudioInputStream(file);
        AudioSystem.write(in, WAVE, out);
        // now play the file, listen and cry...
        AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(out);
        AudioFormat.Encoding encoding = fileFormat.getFormat().getEncoding();
        if (!encoding.equals(PCM_FLOAT)) {
            throw new Exception("Wrong encoding: " + encoding);
        }
    }

}

---------- END SOURCE ----------