Could not autowire org.springframework.mail.javamail.JavaMailSender

to create Bean don't forgot to specify mail properties, with Java class or in application.properties file, exemple

# configuration email
spring.mail.host=smtp.gmail.com
spring.mail.port=587
spring.mail.username=email
spring.mail.password=password
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

You may have forgotten to set the following properties:

spring.mail.host
spring.mail.username
spring.mail.password
spring.mail.port

1. check application.properties config, such as:

   spring.mail.host=smtp.xxx.com
   [email protected]
   spring.mail.password=xxxxx
   spring.mail.properties.mail.smtp.auth=true
   spring.mail.properties.mail.smtp.starttls.enable=true
   spring.mail.properties.mail.smtp.starttls.required=true
   

2. if you use spring-boot,can check should use @EnableAutoConfiguration this annotation

As per comment from mserioli the answer is that the bean must be declared in the configuration file being called at root.

In this case: Move

@Bean
    public JavaMailSenderImpl mailSender() 

to

public class ExtraConfig {
@Bean
    public JavaMailSenderImpl mailSender() {
        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();

        javaMailSender.setProtocol("SMTP");
        javaMailSender.setHost("127.0.0.1");
        javaMailSender.setPort(25);

        return javaMailSender;
    }
}

which is called in:

@Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[]{ExtraConfig.class};
    }

Thus solving the problem. Thanks guys for assistance.