Java SE (Java Platform, Standard Edition)

Hi,
im testing the filechooser at the moment.
this is what i got:

                FileChooser fileChooser = new FileChooser();
                FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("PNG files (*.png)", "*.png");
                fileChooser.getExtensionFilters().add(extFilter);

                file = fileChooser.showOpenDialog(null);

                iv.setImage(new javafx.scene.image.Image(getClass().getResourceAsStream(file.getPath())));

gettin:

java.lang.NullPointerException: Input stream must not be null

file.getAbsolutPath() doesn't work either, i thought this was the reason.
what am i doing wrong here?

p.png = picture in the filechooser package.
 
iv.setImage(new javafx.scene.image.Image(getClass().getResourceAsStream(p.png)));

works fine.
Thanks for the help.
im using windows.