Spring-boot + 邮件/会话 JNDI 资源 = NoSuchBeanDefinitionException (JavaMailSender)答案

【问题标题】：Spring-boot + mail/Session JNDI resource = NoSuchBeanDefinitionException (JavaMailSender)Spring-boot + 邮件/会话 JNDI 资源 = NoSuchBeanDefinitionException (JavaMailSender)
【发布时间】：2016-10-01 00:11:40
【问题描述】：

我已经为将邮件/会话配置为 JNDI 资源（在 Tomcat 端声明）苦苦挣扎了几天（并且没有进展），以便由 spring-boot 应用程序获取。这样做的目的是避免在应用程序中包含任何关键信息，例如用户/密码数据。

（注意 1：通过 SMTP 的凭据和连接已经过测试，具有应用程序端配置，硬编码在 application.properties 中，所以这不是问题）。

我当前使用的配置如下：

server.xml ($TOMCAT/conf)

<Resource
   name="mail/Session"
   auth="Container"
   type="javax.mail.Session"
   username="user@test.com"
   password="XXX"
   mail.user="user@test.com"
   mail.password="XXX"
   mail.transport.protocol="smtp"
   mail.smtp.host="smtp.test.com"
   mail.smtp.auth="true"
   mail.smtp.port="587"/>

context.xml (webapp/META-INF)

<Context>
    <ResourceLink 
        name="mail/Session"
        global="mail/Session"
        auth="Container"
        type="javax.mail.Session"/>
</Context>

application.properties

spring.mail.jndi-name=java:comp/env/mail/Session

在 pom.xml 我有 spring-boot-starter-mail 依赖项（以及其他必要的依赖项）。我在其中注入 JavaMailSender bean 的类是这个（简化的）：

(注意2：使用的spring-boot版本是1.2.8.RELEASE)

@Service("emailService")
public class EmailService {

    @Autowired
    public JavaMailSender javaMailSender;

    public void sendSimpleMail(/* ... */) throws MessagingException {

        //Create message
        MimeMessage message = javaMailSender.createMimeMessage();

        MimeMessageHelper helper = new MimeMessageHelper(message);
        helper.setFrom(fromAddress);
        helper.setTo(toAddress);
        helper.setSubject(subject);
        helper.setText(body);

        //Send message
        javaMailSender.send(message);
    }
}

我知道一旦找到 jndiName 或主机、端口、用户名、密码...spring.mail properties，spring-boot 自动配置应该创建 JavaMailSender bean（后者在我在应用程序中设置主机、端口、用户名和密码时起作用.properties)，但是当我使用 jndiName 选项时它会抛出以下堆栈：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'emailService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: public org.springframework.mail.javamail.JavaMailSender com.testapp.service.EmailService.javaMailSender; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.mail.javamail.JavaMailSender] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1208)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:690)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:322)
    at org.springframework.boot.context.web.SpringBootServletInitializer.run(SpringBootServletInitializer.java:135)
    at org.springframework.boot.context.web.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:126)
    at org.springframework.boot.context.web.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:82)
    at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:175)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5240)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
    ... 10 more
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: public org.springframework.mail.javamail.JavaMailSender com.testapp.service.EmailService.javaMailSender; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.mail.javamail.JavaMailSender] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 29 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.mail.javamail.JavaMailSender] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 31 more

我有一个以相同方式配置为 JNDI 资源的数据源，它运行良好。 (mail)Session 需要不同的方法还是我在它的配置上遗漏了什么？

【问题讨论】：

jndi 已在 Spring Boot 1.3 中添加，因此不适用于 1.2。
该死...我知道您指的是 JNDI 对 JavaMailSender Bean 自动配置的支持（否则我的应用程序将无法连接到我的数据库）。那么这是否意味着为了初始化 bean，我需要手动进行，而如果我在应用程序中硬编码设置属性，bean 初始化会自动完成？ @.ô
是或者升级spring boot :)。
会做，只是希望不要在过程中发现太多问题。谢谢兄弟！

标签： spring spring-boot jakarta-mail jndi tomcat8

【解决方案1】：

正如@m-deinum 在 cmets 中指出的那样，问题不在于配置，而在于 1.3.x 下的 spring-boot 版本缺乏 JNDI 支持

为了解决这个问题，我最终听取了 @m-deinum 的提示并将 spring-boot 从 1.2.8 升级到 1.3.5... 处理一些已弃用的类和新的配置并准备就绪！

【讨论】：