package test;


import java.sql.*;
import oracle.jdbc.pool.*;

public class ThinTnsnames {
  // private static OracleConnection connection = null;
  static String sql = null;

  public static void main(String[] args) {
    String entry_name = "LITPUB_RO"; //args [0];
    String userId = "cdb_reader"; // args [1];
    String password = "reader"; //args [2];
    test (entry_name, userId, password);
  }

  public static void test (String entry_name, String userId, String password) {
    Connection pconnection = null;
    try {
    	System.setProperty("oracle.net.tns_admin", "/sw/common/oracle");
    //	String url = "jdbc:oracle:thin:@mytns_alias";
    //	Connection conn = DataSource.getConnection (url, userName, password);
      String l_url = "jdbc:oracle:thin:@" + entry_name;
      System.out.println( " Connection string = " + l_url );

      OracleDataSource ods = new OracleDataSource();
      ods.setUser(userId);
      ods.setPassword(password);
      ods.setURL(l_url);
      pconnection = ods.getConnection ();
      version (pconnection );
    }
    catch(SQLException e) {
      e.printStackTrace();
    }
    finally {
      try {
        if (pconnection != null )pconnection .close();
      }
      catch(Exception e) {
        e.printStackTrace();
      }
    }
  }

  public static void version (Connection pconnection) {
    try {
      DatabaseMetaData dmd = pconnection.getMetaData();
      System.out.println("DriverVersion: ["+dmd.getDriverVersion()+"]");
      System.out.println("DriverMajorVersion: ["+dmd.getDriverMajorVersion()+"]");
      System.out.println("DriverMinorVersion: ["+dmd.getDriverMinorVersion()+"]");
      System.out.println("DriverName: ["+dmd.getDriverName()+"]");
      System.out.println("URL: ["+dmd.getURL()+"]");
      System.out.println("UserName: ["+dmd.getUserName()+"]");
      System.out.println(dmd.getDatabaseProductName() );
      System.out.println(dmd.getDatabaseProductVersion() );

      String ver;
      ver = System.getProperty("java.version");
      System.out.println("The JDK version is " + ver);
    }
    catch(SQLException e) {
      e.printStackTrace();
    }

  }
}



note this is the MOS example with the cmd line params embedded (System.setProperty...)

throws this

Connection string = jdbc:oracle:thin:@LITPUB_RO
java.sql.SQLException: Io exception: SO Exception was generated
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:158)
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:206)
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:382)
	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:336)
	at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:374)
	at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:150)
	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:576)
	at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:253)
	at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:180)
	at test.ThinTnsnames.test(ThinTnsnames.java:31)
	at test.ThinTnsnames.main(ThinTnsnames.java:15)



if I try to connect with the host:port:service name  syntax it works fine

jdbc:oracle:thin:@//ora-clu2b-vip:1541/TESTLIT