Applet cannot load files from jar

Using Java 1.7.25(Security set to minimum, 32bit if that matters), Windows 8, Google Chrome.

I wrote an Applet which needs to load some images. Everything is packed in jar and html file looks like this:

<html>
 <body>
   <applet code="package.AppletRun.class"
           archive="appletJar.jar" width="1100" height="700">
   </applet>
 </body>
</html>

I tried to load images using several techniques:

Image image = applet.getImage(applet.getCodeBase());
Image image = getClass().getResource("relative/package/filename");
Image image = getClass().getResource("/absolute/package/filename");
Image image = getClass().getResource("filename"); //same package
Image image = someStrangeThingsICantEvenRemeber();

The problem is everything works fine (I set not to load any images) but images just don't want to load, console shows javaNullPointerException. In Eclipse there is no problem, applet viewer doesn't complain. How can I load images from jar(same for class files) to my applet?

What's more applet.getCodeBase() returns null and I'm 100% sure that I'm not creating JApplet instance myself.

Solution

Problem is not with code, but in java(or it's security settings). You have to self-sign jar file you are using. Browser will complain with more warning windows but in the end it will let load(find, access?) files using getClass().getResources(...). I have no idea what this signing change, but it works.