无法从Java连接到Oracle DB - ORA-12560：TNS：协议适配器错误

Question

This is my first Java application I am creating (using Eclipse IDE) and the second Oracle based app (I'm a .NET/MSSQL guy for years). The first Oracle app I wrote in .NET did not have any issues, and I'm trying to connect to the same server.

• I have installed:
  • 'Java 2 Platform, Enterprise Edition 1.4 SDK'
  • 'Java DB `10.5.3.0' -'Java(TM) 6 Update 21
  • 'Java(TM) SE Development Kit 6 update 21
  • 'Oracle IRM Client' (11g)
  • Oracle 11g Release 2 JDBC Drivers (ojdbc6.jar)

My code is very simple. Here it is:

  OracleDataSource ods = new OracleDataSource();
            ods.setURL("jdbc:oracle:oci:@");
            ods.setUser("username");
            ods.setPassword("password");
            ods.setServerName("servername");
            ods.setPortNumber(1549);
            ods.setServiceName("foo.myservice.com");
   Connection conn = ods.getConnection();

I get below exception:

Exception in thread "main" java.sql.SQLException: ORA-12560: TNS:protocol adapter error

at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:737)
at oracle.jdbc.driver.T2CConnection.logon(T2CConnection.java:401)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531)
at oracle.jdbc.driver.T2CConnection.<init>(T2CConnection.java:148)
at oracle.jdbc.driver.T2CDriverExtension.getConnection(T2CDriverExtension.java:53)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:280)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:207)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:157)
at Select.GetScalar(Select.java:47)
at Job.Run(Job.java:20)
at Main.main(Main.java:19)

I have google'd the hack out of this.. I've tried adding a 'TNS entry to the tnsnames.ora file'. I've tried adding '##NAMES.DIRECTORY_PATH = (TNSNAMES, EZCONNECT)' to the sqlnet.ora file. I've tried various other things but nothing is working.

Has anyone experienced this before and has any clue on how to get this to work?? Am I using the wrong version? Server is remote (I don't have Oracle server installed locally, just client). Maybe I have wrong version of Java SDK or the wrong version of the JDBC .jar file?? I just need to connect to Oracle and run a single simple query! Thanks much for any help.

Answer 1

Try using the type IV JDBC driver instead of OCI if you can. The thin url looks like this:

jdbc:oracle:thin:@host[:port]/service

I'd try code that looked more like this (fill in your defaults for the driver, URL, username, and password):

    package persistence;

    import java.sql.*;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;

    public class DatabaseUtils
    {

        private static final String DEFAULT_DRIVER = "";
        private static final String DEFAULT_URL = "";
        private static final String DEFAULT_USERNAME = "";
        private static final String DEFAULT_PASSWORD = "";

        public static void main(String[] args)
        {
            String driver = ((args.length > 0) ? args[0] : DEFAULT_DRIVER);
            String url = ((args.length > 1) ? args[1] : DEFAULT_URL);
            String username = ((args.length > 2) ? args[2] : DEFAULT_USERNAME);
            String password = ((args.length > 3) ? args[3] : DEFAULT_PASSWORD);

            Connection connection = null;

            try
            {
                connection = createConnection(driver, url, username, password);
                DatabaseMetaData meta = connection.getMetaData();
                System.out.println(meta.getDatabaseProductName());
                System.out.println(meta.getDatabaseProductVersion());
            }
            catch (Exception e)
            {
                e.printStackTrace(); 
            }
            finally
            {
                close(connection);
            }
        }

        public static Connection createConnection(String driver, String url, String username, String password) throws ClassNotFoundException, SQLException
        {
            Class.forName(driver);

            if ((username == null) || (password == null) || (username.trim().length() == 0) || (password.trim().length() == 0))
            {
                return DriverManager.getConnection(url);
            }
            else
            {
                return DriverManager.getConnection(url, username, password);
            }
        }

        public static void close(Connection connection)
        {
            try
            {
                if (connection != null)
                {
                    connection.close();
                }
            }
            catch (SQLException e)
            {
                e.printStackTrace();
            }
        }


        public static void close(Statement st)
        {
            try
            {
                if (st != null)
                {
                    st.close();
                }
            }
            catch (SQLException e)
            {
                e.printStackTrace();
            }
        }

        public static void close(ResultSet rs)
        {
            try
            {
                if (rs != null)
                {
                    rs.close();
                }
            }
            catch (SQLException e)
            {
                e.printStackTrace();
            }
        }

        public static void rollback(Connection connection)
        {
            try
            {
                if (connection != null)
                {
                    connection.rollback();
                }
            }
            catch (SQLException e)
            {
                e.printStackTrace();
            }
        }

        public static List<Map<String, Object>> map(ResultSet rs) throws SQLException
        {
            List<Map<String, Object>> results = new ArrayList<Map<String, Object>>();

            try
            {
                if (rs != null)
                {
                    ResultSetMetaData meta = rs.getMetaData();
                    int numColumns = meta.getColumnCount();
                    while (rs.next())
                    {
                        Map<String, Object> row = new HashMap<String, Object>();
                        for (int i = 1; i <= numColumns; ++i)
                        {
                            String name = meta.getColumnName(i);
                            Object value = rs.getObject(i);
                            row.put(name, value);
                        }
                        results.add(row);
                    }
                }
            }
            finally
            {
                close(rs);
            }

            return results;
        }
    }

Answer 2

If you want something simple, you should try using the THIN client instead of OCI client. Don't forget to include the right jar (ojdbc5.jar for Java 5, ojdbc6.jar for Java 6).

Answer 3

Is the ServiceName you specified the service name of the Oracle instance you're trying to connect to? You're sure the port is correct?