Proper way to send e-mail in managed bean - jsf

Question

I'm using this Java code to send messages in JSF page:
import com.web.utils.SendEmail;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
import javax.inject.Named;
import javax.mail.MessagingException;
import javax.servlet.http.Part;
#Named
#ViewScoped
public class Contacts implements Serializable
{
private static final long serialVersionUID = 1L;
private Part file;
private String name;
private String senderEmail;
private String telephone;
private String comment;
private String result;
public Contacts()
{
}
public void sendEmail() throws IOException, MessagingException
{
String[] to =
{
"test#gmail.com"
}; // list of recipient email addresses
String subject = name + " " + senderEmail + " " + telephone;
SendEmail mail = new SendEmail();
result = mail.intiSendEmail(to, subject, comment, file);
}
public void upload()
{
if (file != null)
{
try (InputStream inputStream = file.getInputStream(); FileOutputStream outputStream = new FileOutputStream("D:" + File.separator + "files" + File.separator + file.getSubmittedFileName()))
{
int bytesRead = 0;
final byte[] chunck = new byte[1024];
while ((bytesRead = inputStream.read(chunck)) != -1)
{
outputStream.write(chunck, 0, bytesRead);
}
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Upload successfully ended!"));
}
catch (IOException e)
{
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Upload failed!"));
}
}
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public String getSenderEmail()
{
return senderEmail;
}
public void setSenderEmail(String senderEmail)
{
this.senderEmail = senderEmail;
}
public String getTelephone()
{
return telephone;
}
public void setTelephone(String telephone)
{
this.telephone = telephone;
}
public String getComment()
{
return comment;
}
public void setComment(String comment)
{
this.comment = comment;
}
public String getResult()
{
return result;
}
public void setResult(String result)
{
this.result = result;
}
public Part getFile()
{
return file;
}
public void setFile(Part file)
{
this.file = file;
}
}
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.util.ByteArrayDataSource;
import javax.servlet.http.Part;
public class SendEmail implements Serializable
{
private String USER_NAME = "test";
private String PASSWORD = "test!";
public String intiSendEmail(String[] to, String subject, String body, Part file) throws IOException, MessagingException
{
String status;
Properties props = System.getProperties();
String host = "smtp.gmail.com";
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", USER_NAME);
props.put("mail.smtp.password", PASSWORD);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props);
MimeMessage message = new MimeMessage(session);
try
{
message.setFrom(new InternetAddress(USER_NAME));
InternetAddress[] toAddress = new InternetAddress[to.length];
// To get the array of addresses
for (int i = 0; i < to.length; i++)
{
toAddress[i] = new InternetAddress(to[i]);
}
for (int i = 0; i < toAddress.length; i++)
{
message.addRecipient(Message.RecipientType.TO, toAddress[i]);
}
message.setSubject(subject);
message.setText(body);
/**
* If file is not attached skip setting content
*/
if (file != null)
{
MimeBodyPart messageBodyPart = new MimeBodyPart();
Multipart multipart = new MimeMultipart();
messageBodyPart = new MimeBodyPart();
ByteArrayDataSource ds = new ByteArrayDataSource(file.getInputStream(), file.getContentType());
messageBodyPart.setDataHandler(new DataHandler(ds));
messageBodyPart.setFileName(file.getName());
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
}
Transport transport = session.getTransport("smtp");
transport.connect(host, USER_NAME, PASSWORD);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
}
catch (AddressException ae)
{
ae.printStackTrace();
return status = "Cannot send Message!";
}
catch (MessagingException me)
{
me.printStackTrace();
return status = "Cannot send Message!";
}
return status = "Message is send!";
}
/**
* For testing
*/
public void upload()
{
Part file = null;
if (file != null)
{
try (InputStream inputStream = file.getInputStream(); FileOutputStream outputStream = new FileOutputStream("D:" + File.separator + "files" + File.separator + file.getSubmittedFileName()))
{
int bytesRead = 0;
final byte[] chunck = new byte[1024];
while ((bytesRead = inputStream.read(chunck)) != -1)
{
outputStream.write(chunck, 0, bytesRead);
}
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Upload successfully ended!"));
}
catch (IOException e)
{
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Upload failed!"));
}
}
}
}
I added thread pool in order to speedup page performance. But I as you can see the code execution is not properly handled when package is redeployed. What it the proper way to stop Thread pool in JSF?