Invoking a Mail Service - java.lang.NullPointerException: null

Question

I am new to Java Spring Boot - and I am trying to invoke a Mailer class to send out an email.

-- so at this forgot password stage - I reset the password and now I want to send the user their new password via email.

I've tried to do the following.

-- in my user handling controller

        //send
        MailService mailer = new MailService();
            mailer.sendEmail();

-- the mail service looks like this -- before there was a request mapping to send an email out when you went to /simpleemail.

package services;

import java.util.HashMap;
import java.util.Map;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Controller;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

//import org.apache.velocity.app.VelocityEngine;
import freemarker.template.Configuration;

@Controller
public class MailService {

    @Autowired
    private JavaMailSender mailSender;

    @Autowired
    Configuration fmConfiguration;    

    /*
    @RequestMapping("/simpleemail")
    @ResponseBody
    String home() {
        try {
            sendEmail();
            return "Email Sent!";
        }catch(Exception ex) {
            return "Error in sending email: "+ex;
        }
    }*/

    public MailService(){

    }


    public void sendEmail() throws Exception{


        MimeMessage mimeMessage = mailSender.createMimeMessage();

        try {

            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);

            mimeMessageHelper.setSubject("Hi");
            mimeMessageHelper.setFrom("zzzz@gmail.com");
            mimeMessageHelper.setTo("xxxx@gmail.com");



            Map < String, Object > model = new HashMap < String, Object > ();
            model.put("firstName", "Yashwant");
            model.put("lastName", "Chavan");


            mimeMessageHelper.setText(geContentFromTemplate(model), true);

            mailSender.send(mimeMessageHelper.getMimeMessage());
        } catch (MessagingException e) {
            e.printStackTrace();
        }        


    }

    public String geContentFromTemplate(Map < String, Object > model) {
        StringBuffer content = new StringBuffer();

        try {
            content.append(FreeMarkerTemplateUtils
                .processTemplateIntoString(fmConfiguration.getTemplate("email-template.txt"), model));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return content.toString();
    }
}

This is probably very simple and a duplicate, but you haven't provided your configuration, nor have you provided a stack trace or said where the error is occurring. — Christopher Schneider, Sep 06 '17 at 13:33
java.lang.NullPointerException: null at services.MailService.sendEmail(MailService.java:49) ~[classes/:na] — The Old County, Sep 06 '17 at 13:37
Line 49 in your `MailService` points to the line: `MimeMessage mimeMessage = mailSender.createMimeMessage();` So `mailSender` is null? — pleft, Sep 06 '17 at 13:42
See also: [Spring - Why is my @Autowired field null?](https://stackoverflow.com/questions/19896870/why-is-my-spring-autowired-field-null) — Jesper, Sep 06 '17 at 13:45
Not really sure I follow - do I set a new MailService in my application at run? — The Old County, Sep 06 '17 at 13:59
Should I create a new instance of the Mailer inside the MyService constructor? — The Old County, Sep 06 '17 at 14:01
I am not sure what the solution is - why I can't access the mailer service — The Old County, Sep 06 '17 at 14:15
I didn't understand this solution "@Component annotation as you've already done for CalculatorChooser " — The Old County, Sep 06 '17 at 14:37
https://stackoverflow.com/questions/30279039/spring-autowired-fields-are-null — The Old County, Sep 06 '17 at 14:38
I don't understand this -- when I do the requestmap -- /simpleemail - it works -- when I try to invoke it at the other listener it doesn't follow through — The Old County, Sep 06 '17 at 14:41

Invoking a Mail Service - java.lang.NullPointerException: null

0 Answers0