title: Not able to connect to database through java application
body: <p>I am not able to connect to database(<code>oracle 11g</code>) from my <code>java</code> application.
  I am getting <code>runtime</code> errors. </p>
  
  <p>I have already created the table used in my program. i am using eclipse ide
  here is my program:</p>
  
  <pre><code>    package db;
      import java.sql.*;
      import java.awt.event.*;
      import javax.swing.*;
      public class db extends JFrame implements ActionListener
      {JFrame f;
      JButton b1,b2,b3,b4;
      JLabel l1,l2,l3,l4;
      JTextField t1,t2,t3,t4;
      String s;
      PreparedStatement ps; //=c.prepareStatement();
      ResultSet rs;
      Connection c;
      db()
      { try 
      {f=new JFrame();
      f.setSize(900,900);
      f.setVisible(true);
  
      b1=new JButton("insert");
      b2=new JButton("search"); 
      b3=new JButton("modify");
      b4=new JButton("delete");
  
      l1=new JLabel("eno");
      l2=new JLabel("ename");
      l3=new JLabel("salary");
      l4=new JLabel("DOJ");
  
      t1=new JTextField(30);
      t2=new JTextField(30);
      t3=new JTextField(30);
      t4=new JTextField(30);
      setLayout(null);
  
      f.add(l1);f.add(l2);f.add(l3);f.add(l4);
      l1.setBounds(70,70,50,50);
      l2.setBounds(70,150,50,50);
      l3.setBounds(70,230,50,50);
      l4.setBounds(70,310,50,50); 
  
      f.add(t1);f.add(t2);f.add(t3);f.add(t4);
      t1.setBounds(140,75,70,30);
      t2.setBounds(140,155,70,30);
      t3.setBounds(140,235,70,30);
      t4.setBounds(140,315,70,30);
  
      f.add(b1);f.add(b2);f.add(b3);f.add(b4);
      b1.setBounds(70,400,90,40);
      b2.setBounds(180,400,90,40);
      b3.setBounds(70,500,90,40);
      b4.setBounds(180,500,90,40);  
      b1.addActionListener(this); 
      b2.addActionListener(this); 
      b3.addActionListener(this); 
      b4.addActionListener(this); 
      Class.forName("oracle.jdbc.OracleDriver");
      c=DriverManager.getConnection("jdbc:oracle:thin@127.0.0.1:1521:xe","system","123");
  
      } 
      catch(Exception e2)
      { e2.printStackTrace();
      }  }
      public void actionPerformed(ActionEvent e)
      {     if(e.getSource()==b1)     //insert    
      { try
      { s = "INSERT INTO emp1 (eno,ename,salary,doj) VALUES (?,?,?,?)";
      ps = c.prepareStatement(s);
      ps.setInt(1,Integer.parseInt(t1.getText()));
      ps.setString(2,"t2.getText()");
      ps.setFloat(3,Float.parseFloat(t3.getText()));
      ps.setString(4,"t4.getText()");
      ps.executeUpdate(); 
  
      t1.setText("");
      t2.setText("");
      t3.setText("");
      t4.setText("");
      c.close();
      }
      catch(Exception e1)
      {e1.printStackTrace();
      }}//end if
  
      if(e.getSource()==b2)  //search
      { try{
  
      int id=Integer.parseInt(t1.getText());
      s="select * from emp1 where eno=?";
      ps.setInt(1,id);
      ps = c.prepareStatement(s);
      rs=ps.executeQuery();
  
      if(rs.next())
      {   t2.setText(rs.getString("ename"));
      t3.setText(String.valueOf(rs.getFloat("salary")));
      t4.setText(rs.getString("doj"));
      }
  
      else
      {JOptionPane.showMessageDialog(null,"NO RECORD FOUND");
      }
      c.close();
      }
      catch(Exception e1)
      {e1.printStackTrace();
      }}//end if
  
      if(e.getSource()==b4)//delete
      {try{
      s="delete from emp1 where eno=?";
      ps=c.prepareStatement(s);
      ps.setInt(1,Integer.parseInt(t1.getText()));
      int i=ps.executeUpdate();
      if(i==1)
      {
      JOptionPane.showMessageDialog(null,"RECORD DELETED");
      }
      else
      {JOptionPane.showMessageDialog(null,"RECORD NOT FOUND");
      }
      c.close();
      } 
      catch(Exception e1)
      {e1.printStackTrace();
      }
      }//end if
      if(e.getSource()==b3) //modify
      {try
      {int id=Integer.parseInt(t1.getText());
      ps=c.prepareStatement("set ename=?,salary=?,doj=? where eno=?");
      ps.setString(1,"t2.getText()");
      ps.setFloat(2,Float.parseFloat(t3.getText()));
      ps.setString(3,"t4.getText()");
      ps.setInt(4,id);
      int i=ps.executeUpdate();
  
      if(i==1)
      JOptionPane.showMessageDialog(null,"RECORD MODIFIED");
      else     
      JOptionPane.showMessageDialog(null,"RECORD NOT MODIFIED");
      }  
      catch(Exception e1)
      {e1.printStackTrace();
      }
      } // end if
      }
      public static void main(String arr[])
      {new db();
      }
      }
  
  
  
  AND the run time ERRORS are:
  java.sql.SQLException: Invalid Oracle URL specified
  at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:441)
  at java.sql.DriverManager.getConnection(Unknown Source)
  at java.sql.DriverManager.getConnection(Unknown Source)
  at db.db.&lt;init&gt;(db.java:71)
  at db.db.main(db.java:216)
  </code></pre>