if (permissions != null)
if (permissions != null && permissions.length() > 0)
		public boolean setPermissions(			User user,			String resource,			String owner,			String ownerGroup,			String permissions)			throws EXistException, PermissionDeniedException {			DBBroker broker = null;			try {				broker = brokerPool.get();				org.exist.security.SecurityManager manager =					brokerPool.getSecurityManager();				Collection collection = broker.getCollection(resource);				if (collection == null) {					DocumentImpl doc =						(DocumentImpl) broker.getDocument(user, resource);					if (doc == null)						throw new EXistException(							"document or collection "								+ resource								+ " not found");					LOG.debug("changing permissions on document " + resource);					Permission perm = doc.getPermissions();					if (perm.getOwner().equals(user.getName())						|| manager.hasAdminPrivileges(user)) {						if (owner != null) {							perm.setOwner(owner);							perm.setGroup(ownerGroup);						}						if (permissions != null)							perm.setPermissions(permissions);						broker.saveCollection(doc.getCollection());						broker.flush();						broker.sync();						return true;					} else						throw new PermissionDeniedException("not allowed to change permissions");				} else {					LOG.debug("changing permissions on collection " + resource);					Permission perm = collection.getPermissions();					if (perm.getOwner().equals(user.getName())						|| manager.hasAdminPrivileges(user)) {						if (permissions != null)							perm.setPermissions(permissions);						if (owner != null) {							perm.setOwner(owner);							perm.setGroup(ownerGroup);						}						broker.saveCollection(collection);						broker.flush();						broker.sync();						return true;					} else						throw new PermissionDeniedException("not allowed to change permissions");				}			} catch (SyntaxException e) {				throw new EXistException(e.getMessage());			} catch (PermissionDeniedException e) {				throw new EXistException(e.getMessage());			} finally {				brokerPool.release(broker);			}		}