code: public void setIsolation(String iso) throws JspTagException {
  
          if (TRANSACTION_READ_COMMITTED.equals(iso)) {
              isolation = Connection.TRANSACTION_READ_COMMITTED;
          } else if (TRANSACTION_READ_UNCOMMITTED.equals(iso)) {
              isolation = Connection.TRANSACTION_READ_UNCOMMITTED;
          } else if (TRANSACTION_REPEATABLE_READ.equals(iso)) {
              isolation = Connection.TRANSACTION_REPEATABLE_READ;
          } else if (TRANSACTION_SERIALIZABLE.equals(iso)) {
              isolation = Connection.TRANSACTION_SERIALIZABLE;
          } else {
              throw new JspTagException(
                      Resources.getMessage("TRANSACTION_INVALID_ISOLATION"));
          }
      }
docs: Setter method for the transaction isolation level.