@Autowired
private JavaMailSender mailSender;

public void send() {
   MimeMessage mimeMessage = mailSender.createMimeMessage();  ---- Вот тут NullPointerExeption;

#email property
spring.mail.host=mail.ukraine.com.ua
spring.mail.protocol=smtp
spring.mail.port=25
spring.mail.username=eugen@karpkoi.com.ua
spring.mail.password=test
spring.mail.default-encoding=UTF-8
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.ssl.enable=true
spring.mail.properties.mail.debug=true
spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory