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스프링부트에서 메일 발송 기능 구현 중 다음과 같은 에러가 발생하였다.

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mailService': Unsatisfied dependency expressed through field 'javaMailSender'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.mail.javamail.JavaMailSender' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 
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Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.mail.javamail.JavaMailSender' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1646) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1205) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]

 

소스코드

기본적인 maven dependency추가 후 @Autowired했음

 

문제해결

@Bean으로 다음과 같이 protocol, host, port 지정 해줌

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

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

        return javaMailSender;
    }
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