java sql SQLException IO Exception The Network adapter could not establish the connection

Question

Hello, I'm trying to establish a connection to an Oracle 11g database using the ojdbc14 jar on Eclipse Kepler with Java 8 on a Windows 7 operating system. However, I encounter the following issue when I run the code. Here is mine and any necessary corrections.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Scanner;

    public class JDBCExample {
      public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.println("enter your databse details");
       System.out.println("user name");
       String uName = sc.next();
       System.out.println("password");
       String pWord = sc.next();
       try {
          Class.forName("oracle.jdbc.driver.OracleDriver");
       } catch (ClassNotFoundException e) {
        e.printStackTrace();
       }
       Connection conn = null;
       try {
        conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:orcl", "scott", "tiger");
        // jdbc:oracle:thin:@server:1521:xe
       } catch (SQLException e) {
        e.printStackTrace();
       }
       if (conn != null) {
        System.out.println("Successfully connected to DB");
        } else {
        System.out.println("Failed to connect to DB");
       }
   }
}

And the Errors are as follows.

 java.sql.SQLException: Io exception: The Network Adapter could not establish the connection at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at JDBCExample.main(JDBCExample.java:23)

Can someone please help me with this? 

Answer 1

As a result of our chat, you can use the command prompt to telnet into a database. After navigating jdbcurl, I discovered the issue.

localhost:1521/xe should be localhost:1521:xe if xe is SID for your database.

Change this code from

conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521/xe", "scott", "tiger");

To

conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:xe", "scott", "tiger");

I hope this helps you.