NullPointerException when loading file from res folder - Java

Question

So I use this code:

    ClassLoader classLoader = getClass().getClassLoader();
    File audioFile = new File(classLoader.getResource("pop.wav").getFile());

    AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile);

    AudioFormat format = audioStream.getFormat();

    DataLine.Info info = new DataLine.Info(Clip.class, format);

    Clip audioClip = (Clip) AudioSystem.getLine(info);
    audioClip.open(audioStream);
    audioClip.start();

But every time it gives me a NullPointerException. The file (pop.wav) is inside src/res. But if a put it on my desktop and instead of classLoader.getResource("pop.wav").getFile() I put C:/Users/gebruiker/Desktop/pop.wav it works.

Possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — Frakcool, Dec 23 '15 at 19:21
Possible duplicate of http://stackoverflow.com/questions/8425481/play-wav-file-from-jar-as-resource-using-java — , Dec 23 '15 at 19:30
more details on this post: http://stackoverflow.com/questions/573679/open-resource-with-relative-path-in-java — guillaume girod-vitouchkina, Dec 23 '15 at 19:33

Jan · Accepted Answer · 2015-12-23T21:02:57.697

0

Resources are not Files.

Try this:

AudioInputStream audioStream = AudioSystem.getAudioInputStream(getClass ().getResourceAsStream ("/res/pop.wav"));

And of cause check path for that pop.wav. sometimes absolute paths within .jar ( /pop.wav ) are easier to manage.

edited Dec 23 '15 at 21:02

answered Dec 23 '15 at 19:35

Jan

13,738
3
30
55

Where is pop.wav in your jar? – Jan Dec 23 '15 at 20:47
I don't know if it matters but this method is called on a mousePressed event – Ruben de Groot Dec 23 '15 at 20:51
[this is a picture of where pop is in eclipse](http://postimg.org/image/qwbn8o0ll/) – Ruben de Groot Dec 23 '15 at 20:56
In that case try /res/pop.wav once – Jan Dec 23 '15 at 20:58
I am sorry, I don't understand it. I am not a really experienced Java programmer. – Ruben de Groot Dec 23 '15 at 21:02
See my edit - its important to set right path to resource. – Jan Dec 23 '15 at 21:03
Yes that works! Thanks a lot, but why did I need to put res before it? – Ruben de Groot Dec 23 '15 at 21:05
same as with files: path to directory matters. Relative to your root folder src/ your wave is located in /res/pop.wav. will you accept/upvote the answer please? – Jan Dec 23 '15 at 21:12

NullPointerException when loading file from res folder - Java

1 Answers1