adding css file to stylesheets in javafx

Question

Language: JavaFX

IDE: Netbeans

Problem: I'm trying to add a css file to the stylesheet, but the first line of the following code always generates a NullPointerException:

String css = this.getClass().getResource("double_slider.css").toExternalForm(); 
scene.getStylesheets().add(css);

I've tried replacing "double_slider.css" with the full path. double_slider.css is currently located in the same package as the class that makes this call. I've also tried all of the variations found at http://introjava.wordpress.com/2012/03/21/linking-a-css-style-sheet-to-javafx-scene-graph/, with no success. Clean and build doesn't help either.

If I place the css file in the build folder where the .class files are dumped, the NullPointerException goes away. But then the css file does not work properly because it references other files in my project.

Answer 1

put your yourname.css file directly under src directory.

scene.getStylesheets().add("yourname.css")

clean and build required

Answer 2

I think your're missing the slashes which causes that the CSS file can't be found. Try to correct your path reference.

For example:

-root
--app/Main.java
--assets/double_slider.css

would be:

String css = this.getClass().getResource("/assets/double_slider.css").toExternalForm();