Question

Hai
I have an application which is designed in netbeans6.0.1 where i need to display an image as an logo.My coding is as below

mLogo = new JLabel();
URL lUrlLogo = getclass().getResource("/com/images/image.gif");
Image lLogoimage = Toolkit.getDefaultToolkit().getImage(lUrlLogo);
ImageIcon licon = new ImageIcon(lLogoimage);
mLogo.setIcon(licon);

My code works fine when i execute it in netbeans but when I try to run my jar file which is created by netbeans in dist folder,it gives me an exception

Uncaught error fetching image:
java.lang.NullPointerException
        at sun.awt.image.URLImageSource.getConnection(Unknown Source)
        at sun.awt.image.URLImageSource.getDecoder(Unknown Source)
        at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
        at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
        at sun.awt.image.ImageFetcher.run(Unknown Source)

Whats the problem with my jar
Can some one help me to run my jar
Thanking u

Answer 1

Your jar file will need to include the image.

See this tutorial or this one for instructions for how to do that. Basically if you include the file in a source folder (with the appropriate path) it should be okay.

If you think you’ve already got the image there, run

jar tvf file.jar

to show the contents. Make sure everything’s where you expect it to be in terms of directories.

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EDIT: As per the comments, the problem turned out to be due to case sensitivity.

Finding resources in a jar file is always case-sensitive, whereas loading them from a file system is only case-sensitive if the file system is. So if your file is image.GIF but you’re looking for image.gif then it’ll work when you’re loading from the file system in Windows, but not in the jar file.