Thread: images are loaded while using eclipse but i get NullPointerException in jar

As you can see I have tried various ways of loading images to my program,

Image iiii = new ImageIcon("src/gra/grafika/ramka.png").getImage();
//Image iiii = new ImageIcon(this.getClass().getResource("grafika/ramka.png")).getImage();
//Image iiii = new ImageIcon(ClassLoader.getSystemResource("gra/grafika/ramka.png")).getImage();
 
this.setIconImage(iiii);

(I keep every image loaded by the same method so i can easily change the way of doing this.)

The point is when i run it in eclipse there there is everything fine, but after making jar i get NullPointerException in line containing " Image iiii = ..." or just no single image appears (no nullpointerexception)

Question is HOW should i load them because I am a little bit resigned after wasting like 12h (pathetic) of testing ways, changing adresses without any success : |

Are the images packaged into the jar as well (unpackage the jar to check and make sure they are there)?

If the images are in the jar you need to access them as resources not files.
You can use a zip utility to look at the contents of a jar file to verify that the path to the images is correct.

Does the URL returned by getResource() look correct? Add a println() call that prints it.

Originally Posted by Teuthoidea

images are in location gra > grafika in jar file

Based upon the path you mentioned above, you should load the image as a resource, passing the absolute path of the package the images reside in. If the image ranka is in /gra/grafika, then pass that path:

Image iiii = new ImageIcon(this.getClass().getResource("/gra/grafika/ramka.png")).getImage();

As Norm mentioned, check the paths to the images...preface the path with a '/' to indicate absolute path (relative to the root package within the jar)

System.out.println(this.getClass().getResource("/gra/grafika/ramka.png"));

this line prints null just like there's no such file

also tested line from copeg
and that's the results of running it
null <- println~
Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:205)

Is the class in a package? Did you try it with the leading / on the path as copeg suggested?
Check the spelling and the path for correctness.

You need to have the path point to where there is a file. It is not something that can be done remotely on this forum. You need to try many different combinations until you find the one that works.

Sorry, what is "path point"? What I was talking about was the paths as you see them in a jar file using a tool like zip file tool.

I see now. I'll reword it: The path should point to where there is a file.

Nothing to do with a point class.
I'll reword it: The path should refer to where there is a file.

Are you saying the program in the jar file executes OK on one PC and has problems loading images on another PC?

problem solved - i thought that it'll load images from the inside of jar but it just has to be in proper folder to run thanks for help