The resolveFunction does not handle the className variable correctly resulting in possible NPEs

For instance className is unitialized in the else, but used none the less.

        String className = null;
        String methodName = null;
        if (uri.startsWith("http://exslt.org"))
        {
            className = getEXSLTClassName(uri);
            methodName = qname.getLocalPart();
        }
        else if (!uri.equals(ExtensionNamespaceContext.JAVA_EXT_URI))
        {
            int lastSlash = className.lastIndexOf("/");
            if (-1 != lastSlash)
                className = className.substring(lastSlash + 1);
        }