I'm starting to support class loaders and I've run into a
NullPointerException. URLClassLoader.findClass() has the following
fragment:
// Now construct the CodeSource (if loaded from a jar file)
CodeSource source = null;
if (url.getProtocol().equals("jar")) {
Certificate[] certificates =
((JarURLConnection)conn).getCertificates();
String u = url.toExternalForm ();
u = u.substring (4); //skip "jar:"
int i = u.indexOf ('!');
if ( i >= 0)
u = u.substring (0, i);
url = new URL (u);
source = new CodeSource(url, certificates);
}
// And finally construct the class!
return defineClass(className, classData,
0, classData.length,
source);
Notice how it only constructs a CodeSource when the url is a jar, now in
SecureClassLoader.defineClass(), we find the follow code:
ProtectionDomain protectionDomain =
new ProtectionDomain(cs, getPermissions(cs));
And URLClassLoader.getPermissions() does:
URL url = source.getLocation();
And this lines throws a NullPointerException, because source is null
(when the class isn't being loaded from a jar).
I think the fix would be to change URLClassLoader.findClass() to always
construct a CodeSource even when the class isn't loaded from a jar.
Regards,
Jeroen
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