public static ResultDocumentFile readByOID(Integer oid) {
public final static ResultDocumentFile readByOID(Integer oid) {
    public static ResultDocumentFile readByOID(Integer oid) {	final ResultDocumentFile documentFile = (ResultDocumentFile) RootDomainObject.getInstance().readFileByOID(oid);		if (documentFile==null) 	    throw new DomainException("error.researcher.ResultDocumentFile.null");	    	return documentFile;    }