Class.forName("oracle.jdbc.driver.OracleDriver");
 Connection con=DriverManager.getConnection(
 "jdbc:oracle:thin:@localhost:1521:amani","system","a123");
 Statement stmt=con.createStatement();
 ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" - "+ rs.getString(2)+" -  "+rs.getInt(3)+"n");

java.sql.SQLException: Io exception: Bad packet type