Sonar: Call async methods via an injected dependency instead of direc…

…tly via 'this' (jhipster#24034)

* Sonar: Call async methods via an injected dependency instead of directly via 'this'

* Sonar: Call async methods via an injected dependency instead of directly via 'this' (use Autowired & Lazy)

generators/server/templates/src/main/java/_package_/service/MailService.java.ejs

@@ -29,7 +29,9 @@ import jakarta.mail.internet.MimeMessage;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.MessageSource;
+import org.springframework.context.annotation.Lazy;
 import org.springframework.mail.MailException;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessageHelper;
@@ -60,6 +62,10 @@ public class MailService {
 
     private final SpringTemplateEngine templateEngine;
 
+    @Autowired
+    @Lazy
+    private MailService self;
+
     public MailService(JHipsterProperties jHipsterProperties, JavaMailSender javaMailSender,
             MessageSource messageSource, SpringTemplateEngine templateEngine) {
 
@@ -101,26 +107,26 @@ public class MailService {
         context.setVariable(BASE_URL, jHipsterProperties.getMail().getBaseUrl());
         String content = templateEngine.process(templateName, context);
         String subject = messageSource.getMessage(titleKey, null, locale);
-        sendEmail(user.getEmail(), subject, content, false, true);
+        self.sendEmail(user.getEmail(), subject, content, false, true);
     }
 <%_ if (!authenticationTypeOauth2) { _%>
 
     @Async
     public void sendActivationEmail(<%= user.persistClass %> user) {
         log.debug("Sending activation email to '{}'", user.getEmail());
-        sendEmailFromTemplate(user, "mail/activationEmail", "email.activation.title");
+        self.sendEmailFromTemplate(user, "mail/activationEmail", "email.activation.title");
     }
 
     @Async
     public void sendCreationEmail(<%= user.persistClass %> user) {
         log.debug("Sending creation email to '{}'", user.getEmail());
-        sendEmailFromTemplate(user, "mail/creationEmail", "email.activation.title");
+        self.sendEmailFromTemplate(user, "mail/creationEmail", "email.activation.title");
     }
 
     @Async
     public void sendPasswordResetMail(<%= user.persistClass %> user) {
         log.debug("Sending password reset email to '{}'", user.getEmail());
-        sendEmailFromTemplate(user, "mail/passwordResetEmail", "email.reset.title");
+        self.sendEmailFromTemplate(user, "mail/passwordResetEmail", "email.reset.title");
     }
 <%_ } _%>
 }