Question

I have a Java Project in NetBeans 7.0.

I want to add some image to some label dynamically. The image will differ depending on the state of the program.

I put one such image, ‘filling.jpg’, in the ‘resources’ folder of my project.

I want to reach this file correctly (not by absolute or relative path, because that will cause problems when I build the jar file).

So I found this method:

ImageIcon fillingIcon = new ImageIcon(getClass().getClassLoader().getResource("filling.jpg"));
labelFontFilling.setIcon(fillingIcon);

It keeps give me java.lang.NullPointerException.
But I am sure that there is that image, because I can assign the image to the label from the NetBeans Properties menu for that label (but I don’t want this, I want to add the image by Java code).

What am I doing wrong, and how can I get that image correctly?

Answer 1

Thanks, Valter Henrique, with your tip i managed to realise, that i simply entered incorrect path to this image.
In one of my tries i use

    String pathToImageSortBy = "resources/testDataIcons/filling.png";
    ImageIcon SortByIcon = new ImageIcon(getClass().getClassLoader().getResource(pathToImageSortBy));

But correct way was use name of my project in path to resource

String pathToImageSortBy = "nameOfProject/resources/testDataIcons/filling.png";
ImageIcon SortByIcon = new ImageIcon(getClass().getClassLoader().getResource(pathToImageSortBy));