title: java error (No suitable driver found)
body: <pre><code>public class ReportView extends JFrame {
  
    Connection con=null;
  
    void showReport() throws SQLException, ClassNotFoundException, JRException {
  
      con=DriverManager.getConnection("jdbc:postgresql://localhost:5432/Test");
      JasperReport report=JasperCompileManager.compileReport("Testing.jrxml");
      JasperPrint print=JasperFillManager.fillReport(report,null,con);
      JRViewer viewer=new JRViewer(print);
      viewer.setOpaque(true);
      viewer.setVisible(true);
      this.add(viewer);
      this.setSize(300, 200);
      this.setVisible(true);
      this.setDefaultCloseOperation(EXIT_ON_CLOSE);       
  }
  </code></pre>
  
  <p>This is error:</p>
  
  <pre>
  Exception in thread "main" java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/Test
      at java.sql.DriverManager.getConnection(Unknown Source)
      at java.sql.DriverManager.getConnection(Unknown Source)
  </pre>
  
  <p>What is the wrong?</p>