public long getNamespaceOwnerId(long contributorId) {
public String getNamespaceOwnerId(String contributorId) { if (contributorId == null) return null;
	public long getNamespaceOwnerId(long contributorId) {		Bundle namespaceBundle = getNamespaceBundle(contributorId);		if (namespaceBundle == null)			return -1;		return namespaceBundle.getBundleId();	}