[BAEL-8315] How to resolve "Could not autowire org.springframework.mail.javamail.JavaMailSender" (#18600)

- implement Email sender application

Author: martin-blazevic

spring-boot-modules/spring-boot-mvc-5/pom.xml

@@ -57,6 +57,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-validation</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-mail</artifactId>
+        </dependency>
     </dependencies>
 
     <build>

spring-boot-modules/spring-boot-mvc-5/src/main/java/com/baeldung/email/application/EmailSenderApplication.java

@@ -0,0 +1,26 @@
+package com.baeldung.email.application;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import com.baeldung.email.service.EmailService;
+
+@SpringBootApplication(scanBasePackages = { "com.baeldung.email.service" })
+public class EmailSenderApplication implements CommandLineRunner {
+
+    private final EmailService emailService;
+
+    public EmailSenderApplication(EmailService emailService) {
+        this.emailService = emailService;
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(EmailSenderApplication.class, args);
+    }
+
+    @Override
+    public void run(String... args) {
+        emailService.sendSimpleEmail("[email protected]", "Test Subject", "Testing the Spring Boot Email!");
+    }
+}

spring-boot-modules/spring-boot-mvc-5/src/main/java/com/baeldung/email/config/EmailConfiguration.java

@@ -0,0 +1,19 @@
+package com.baeldung.email.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.JavaMailSenderImpl;
+
+@Configuration
+public class EmailConfiguration {
+
+    @Bean
+    public JavaMailSender javaMailSender() {
+        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
+        mailSender.setHost("localhost");
+        mailSender.setPort(1025);
+
+        return mailSender;
+    }
+}

spring-boot-modules/spring-boot-mvc-5/src/main/java/com/baeldung/email/service/EmailService.java

@@ -0,0 +1,28 @@
+package com.baeldung.email.service;
+
+import org.springframework.mail.SimpleMailMessage;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.stereotype.Service;
+
+@Service
+public class EmailService {
+
+    private static final String NOREPLY_ADDRESS = "[email protected]";
+
+    private final JavaMailSender javaMailSender;
+
+    public EmailService(final JavaMailSender javaMailSender) {
+        this.javaMailSender = javaMailSender;
+    }
+
+    public void sendSimpleEmail(String to, String subject, String text) {
+
+        SimpleMailMessage message = new SimpleMailMessage();
+        message.setFrom(NOREPLY_ADDRESS);
+        message.setTo(to);
+        message.setSubject(subject);
+        message.setText(text);
+
+        javaMailSender.send(message);
+    }
+}

spring-boot-modules/spring-boot-mvc-5/src/main/resources/application.properties

@@ -17,3 +17,9 @@ logging.level.org.springframework.web.servlet.mvc=TRACE
 # Either extend global exception handler from ResponseEntityExceptionHandler
 # Else use this property to enable problemdetails
 # spring.mvc.problemdetails.enabled=true
+
+# Mail
+spring.mail.host=localhost
+spring.mail.port=1025
+spring.mail.username=
+spring.mail.password=