UrlResource.exists() does not properly detect JBoss vfszip resources

Method org.springframework.core.io.AbstractFileResolvingResource#exists treats jboss vfs URLs (protocol starting with "vfs") as files: it calls getFile().exists(). There is no fallback.

Unfortunately, vfszip:// resources (files inside JAR files) do not support getFile() and throw exception (see org.springframework.core.io.VfsUtils#getFile the "is nested" if command).

One obvious fix would be to provide fallback (that is, if getFile() throws an exception, it continues by handling the URL).
At this moment, the only solution is to not use exists(), but this workaround code instead:

        Resource res = ldr.getResource(locator);
        boolean exists = false;
        try {
            //!!HACK!!
            // Jboss vfzip:// does not support  exists() method
            // so we'll just try opening it and handle exception
            res.getInputStream().close();
            exists = true;
        } catch (IOException e) {
            log.info(this, "cannot open meta.xml", e);
        }
        if (!exists) {

Apparently, this is probably also root cause of SEC-1700