Calling Component in a servlet

Below is my java code snippet for Email servlet

@SlingServlet(paths="/bin/sendEmail", methods = "POST", metatype=true)

public class EmailServlet extends org.apache.sling.api.servlets.SlingAllMethodsServlet {

  private static final Logger LOG = LoggerFactory.getLogger(EmailServlet.class);

  @Reference

    private SlingRepository repository;

    public void bindRepository(SlingRepository repository) {

           this.repository = repository;

           }

    @Reference

    private transient EmailService emailService;

    @Override

    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServerException, IOException {

     try

     {

        //Get the submitted form data that is sent from the

             //CQ web page

         String subject = request.getParameter("subject");

         String message = request.getParameter("message");

         String toEmail = request.getParameter("toAddress");

         String fromEmail = request.getParameter("fromAddress");

         EmailService mailService = new EmailServiceImpl();

         LOG.info("before calling send email method:");

         mailService.send(toEmail,fromEmail,subject,message,null); // Calling the component

         LOG.info("after calling send email method:");

            //Get the JSON formatted data 

            //Return the JSON formatted data

        //response.getWriter().write(jsonData);

     }

     catch(Exception e)

     {

         e.printStackTrace();

     }

   }

}

Below is my java code snippet for Email service component

@Component(metatype=true,immediate = true, enabled=true, label = "Email Service Info")

@Service(value = {EmailService.class})

public class EmailServiceImpl implements EmailService{

  private static final Logger LOG = LoggerFactory.getLogger(EmailServiceImpl.class);

  @Reference

  private ResourceResolverFactory resolverFactory;

  //private final Logger logger = LoggerFactory.getLogger(getClass());

  @Property(label = "Smtp server", description="Smtp server info")

  public static final String SMTP_SERVER = "server";

  @Property(label="port", description = "Smtp port")

  public static final String SMTP_PORT = "port";

  @Property(label="username", description = "username")

  public static final String EMAIL_USERNAME = "username";

  @Property(label="password", description = "password")

  public static final String EMAIL_PASSWORD = "password";

  @Property(label="template path", description = "Email template path")

  public static final String EMAIL_TEMPLATE = "template_path";

  //local variables to hold OSGI config values

  private String server;

  private String port;

  private String username;

  private String password;

  private String template_path;

  @Activate

  protected void activate(Map<String,Object> properties){

  LOG.info("entered the activate method");

  configure(properties,"Activated");

  }

  @Modified

  protected void modified(Map<String, Object> properties){

  configure(properties,"Modified");

  }

  @Deactivate

  protected void deactivated(Map<String, Object> properties){

  }

  protected void configure(Map<String,Object> properties,String status){

  server = PropertiesUtil.toString(properties.get(SMTP_SERVER),StringUtils.EMPTY);

  port = PropertiesUtil.toString(properties.get(SMTP_PORT), StringUtils.EMPTY);

  username = PropertiesUtil.toString(properties.get(EMAIL_USERNAME), StringUtils.EMPTY);

  password = PropertiesUtil.toString(properties.get(EMAIL_PASSWORD), StringUtils.EMPTY);

  template_path = PropertiesUtil.toString(properties.get(EMAIL_TEMPLATE), StringUtils.EMPTY);

  LOG.info("configured the details:"+server+" port:"+port); // configured values appear

  }

  //send function should be here

  public void send(String toEmail, String fromEmail, String aSubject, String aMessage,Resource templateResource)

  {

  try

  {

  // Recipient's email ID needs to be mentioned.

  String to = toEmail;

  LOG.info("to address"+ toEmail);

  // Sender's email ID needs to be mentioned

  String from = fromEmail;

  LOG.info("from address"+ fromEmail);

  LOG.info("subject"+ aSubject);

  LOG.info("server"+ server);// appears null in the log

  LOG.info("port"+ port);// appears null in the log

  // Reply To

  //Address [] ad = new InternetAddress;

  // Get system properties

  java.util.Properties properties = System.getProperties();

  // Setup mail server (Depending upon your

  // Mail server - you may need more props here

  properties.setProperty("mail.smtp.auth", "true");

  properties.setProperty("mail.smtp.starttls.enable", "true");

  properties.setProperty("mail.smtp.host", server);

  properties.setProperty("mail.smtp.port", port);

  // Get the default Session object.

  Session session = Session.getInstance(properties,

  new javax.mail.Authenticator() {

  protected PasswordAuthentication getPasswordAuthentication() {

  return new PasswordAuthentication(username, password);

  }

  });

  // Create a default MimeMessage object.

  MimeMessage message = new MimeMessage(session);

  // Set From: header field of the header.

  message.setFrom(new InternetAddress(from));

  //Set Replyto: header to reply to this address

  message.setReplyTo(new Address[]

  {new InternetAddress(from)});

  // Set To: header field of the header.

  message.addRecipient(Message.RecipientType.TO,

  new InternetAddress(to));

  // Set Subject: header field

  message.setSubject(aSubject);

  // Now set the actual message

  message.setText(aMessage);

  // Send message

  Transport.send(message);

  LOG.info("sent message");

  }

  catch (Exception ex)

  {

  ex.printStackTrace();

  }

  }

I am in a hurry to complete this task. It would be really helpful if you could point out the error for now so that I can correct it asap. Thanks.

I have a small query about the component attributes. what happens when the immediate attribute is set to false? When can it be activated if configured as false?

Take a look at . Getting Started with OSGi Declarative Services | vogella blog

Thanks Vivek, it worked once I removed the instantiation. 

Please change:

  @Reference

    private transient EmailService emailService;

to

  @Reference

    private  EmailService emailService;

Regards

Thanks magic loc, It worked!