code: private String getIdColumn() throws SQLException
     {
        try
        {
           return lockManagerEntry.getParameterValue(ISPNCacheableLockManagerImpl.INFINISPAN_JDBC_CL_ID_COLUMN_NAME);
        }
        catch (RepositoryConfigurationException e)
        {
           throw new SQLException(e);
        }
     }
docs: Returns the column name which contain node identifier.