Need help reading file directory from applet!

Hi i am writing a java applet which has to read in several text files from its codebase directory. I have this code at the moment which causes a nullpointerexception:
public void initTables()
        File dir = new File(getCodeBase().getPath());
        File[] files = dir.listFiles();
        for (int i = 0; i < files.length; i++)//null pointer here
            String fileName = files.getName();
if(fileName.endsWith("set.txt"))
fileName = fileName.substring(0, (fileName.length() - 4));
Table t = new Table(this, fileName);
}Anybody know whats going on here?
thanks

Sorry i thought it was a null pointer, it's actually this:
java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\Emud\Documents\pokemon read)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkRead(Unknown Source)
     at java.io.File.list(Unknown Source)
     at java.io.File.listFiles(Unknown Source)
     at Gui.initTables(Gui.java:75)
     at Gui.init(Gui.java:16)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\Emud\Documents\pokemon read)
yeah, i'm making a program about pokemon...cos i'm cool 8)

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