docs: private static DataSource lookupDS(String dsJndiLocation) {
          DataSource ds;
          try {
              InitialContext ctx = new InitialContext();
              ds = (DataSource) ctx.lookup(dsJndiLocation);
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
  
          if (ds == null) {
              throw new RuntimeException("Datasource not found: " + dsJndiLocation); //$NON-NLS-1$
          }
          return ds;
      }