Java EE (Java Enterprise Edition) General Discussion

<%@ page import="java.security.Security,java.util.Properties,javax.mail.Message,javax.mail.PasswordAuthentication;
import javax.mail.Session,javax.mail.Transport,javax.mail.internet.InternetAddress,javax.mail.internet.MimeMessage" %>


<%try{
          String subject =request.getParameter("subject");
          String body =request.getParameter("body");
          String sender=request.getParameter("to");
          String recipients=request.getParameter("from");
             
                String mailhost = "smtp.gmail.com";
		Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
		 
		Properties props = new Properties();
		props.setProperty("mail.transport.protocol", "smtp");
		props.setProperty("mail.host", mailhost);
		props.put("mail.smtp.auth", "true");
		props.put("mail.smtp.port", "465");
		props.put("mail.smtp.socketFactory.port", "465");
		props.put("mail.smtp.socketFactory.class",
		"javax.net.ssl.SSLSocketFactory");
		props.put("mail.smtp.socketFactory.fallback", "false");
		props.setProperty("mail.smtp.quitwait", "false");

		Session sessions = Session.getDefaultInstance(props,
				new javax.mail.Authenticator() 
		{
			protected PasswordAuthentication getPasswordAuthentication()
			{ return new PasswordAuthentication("vanumasrikanth","******");	}
		});		
 
		javax.mail.internet.MimeMessage message = new MimeMessage(sessions);
		message.setSender(new InternetAddress(sender));
		message.setSubject(subject);
		message.setContent(body, "text/plain");
		if (recipients.indexOf(',') > 0) 
		message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
		else
		message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
 
		
		Transport.send(message);
                out.print("mail sent");
              
           }
           catch (Exception e) {out.print(e);
           
           }

           
	
        
        %>

java.lang.SecurityException: Access to default session denied