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String URL= "jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=" +
  "(ADDRESS=(PROTOCOL=TCP)(HOST=ip1)(PORT=1521))" +
  "(ADDRESS=(PROTOCOL=TCP)(HOST=ip2)(PORT=1521))" +
  "(LOAD_BALANCE=yes)(FAILOVER=on))" +
  "(CONNECT_DATA=(SERVICE_NAME=orcl)))" ;