Java getResource not working in a .jar file

Question

i am trying to export a pacman game i made from eclipse to a .jar package. The problem is that while everything runs fine on eclipse, when the .jar is exported, the resources i use dont load properly. I have them in a separate /res folder, which is on the build path. I access them in the following ways:

ClassLoader classLoader = getClass().getClassLoader(); try{ image = ImageIO.read(new File(classLoader.getResource("images/PM0.gif").getFile())); } catch (IOException e1) { e1.printStackTrace(); }

File file = new File(classLoader.getResource("levels/"+fileName).getFile());

What am i doing wrong?here is an example of the errors i get(only in the exported .jar on eclipse it runs fine)

Objects in a jar are not files and you can't use File to access them. — greg-449
– greg-449, Commented Mar 11, 2017 at 8:10

Alon Segal · Accepted Answer · 2017-03-10 22:59:04Z

5

When working with resources, you should always have them as streams and not as files (unless you're trying to do something really weird).

try the following:

ImageIO.read(classLoader.getResourceAsStream("images/PM0.gif"))

answered Mar 10, 2017 at 22:59

Alon Segal

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2 Comments

user19955 Over a year ago

I tried it seems to work, but a scanner i am using is giving me problems Scanner s = new Scanner(this.getClass().getClassLoader().getResourceAsStream("levels/"+fileName)); This doesnt seem to work properly when packaged.

Alon Segal Over a year ago

@user19955 If you're trying to read the file than you should not be using Scanner, try that solution instead: stackoverflow.com/questions/29611661/…

Sheinbergon · Accepted Answer · 2017-03-10 22:55:41Z

In order to retrieve resources from placed inside a jar, you need to use getResourceAsStream().

It works on eclipse because the runtime environment is executed using the "unpacked" JAR ( or better put - prepacked ) using actual files.

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