in src/main/java/org/apache/sling/superimposing/impl/SuperimposingResourceProviderImpl.java [154:163]
static boolean hasOverlayResource(ResourceResolver resolver, String path) {
// check for overlay resource by checking directly in underlying JCR
final Session session = resolver.adaptTo(Session.class);
try {
return (null != session && session.itemExists(path));
} catch (RepositoryException e) {
log.error("Error accessing the repository. ", e);
}
return false;
}