Java applet resource loading problem

Question

I just converted a Java Web Start application to an applet. It is taking more time than before to load, so I enabled the highest level of logging in the console.

The program uses a lot of resources stored in .jar files. However, it tries to download some of them from the codebase on the web server! The response is obviously 404, but it still wastes a lot of time since there are so many files. And once everything finally loads, all of the resources work as they should! Why is it doing this, and how do I get it to stop?

Resource loading code:

public static BufferedImage loadImage(String name, String path) throws IOException
{
    URL url = AssetManager.class.getResource(path.replace("resource://", "resources/"));
    if(url == null)
        throw new IOException("Resource not found: "+path);

    BufferedImage image = ImageIO.read(url);
    images.put(name, image);
    return image;
}

I edited the code into the original question. "resources" is a folder inside one of the .jars (but not the one that this code is in, could that be a problem?) — phpscriptcoder
– phpscriptcoder, Commented Apr 28, 2011 at 21:46
what happens if you do something like, BufferedImage image = ImageIO.read(url.openStream()); (but make sure to close the stream in a finally block) — sbridges
– sbridges, Commented Apr 29, 2011 at 4:15
What do you get when you do System.out.println(((URLClassLoader) AssetManager.class.getClassLoader()).getURLs()) — sbridges
– sbridges, Commented May 1, 2011 at 14:32

Paŭlo Ebermann · Accepted Answer · 2011-04-28 01:28:04Z

1

I observed this, too, and I'm not really sure how to avoid the plugin loading classes from HTTP instead of the jars. You could try to use jar indexes (so the VM would know which class/resource is in which jar). There might be some applet tag or JNLP file option to avoid this, too.

answered Apr 28, 2011 at 1:28

Paŭlo Ebermann

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