Spring Boot Autowire自己的类

我有麻烦，因为它的名字自动装配我自己的类。我创建了一个MailSender通过JavaMailSender发送邮件。Spring Boot Autowire自己的类

@Service 
public class MailSender { 

    @Autowired 
    private JavaMailSender javaMailSender; 

    public void send(File file) throws MailSendingException { 
     // send my mail 
    } 

}

如果我尝试使用我的MailSender在我的控制器与@Autowired private MailSender mailSender;我得到以下信息：

场mailSender在my.app.controller.MyController所需类型的豆“my.app .mail.MailSender'找不到。

. ____   _   __ _ _ 
/\\/___'_ __ _ _(_)_ __ __ _ \ \ \ \ 
(()\___ | '_ | '_| | '_ \/ _` | \ \ \ \ 
\\/ ___)| |_)| | | | | || (_| | )))) 
    ' |____| .__|_| |_|_| |_\__, |//// 
=========|_|==============|___/=/_/_/_/ 
:: Spring Boot ::  (v1.4.2.RELEASE) 

14-Dec-2016 12:17:45.724 SEVERE [http-nio-8084-exec-34] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/my-app]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726) 
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702) 
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697) 
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:579) 
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:455) 
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1554) 
    at sun.reflect.GeneratedMethodAccessor170.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) 
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) 
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) 
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1428) 
    at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:885) 
    at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:343) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:615) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74) 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652) 
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myController': Unsatisfied dependency expressed through field 'mailSender'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'my.app.mail.MailSender' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:592) 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:370) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:754) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) 
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) 
    at org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:151) 
    at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:131) 
    at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:86) 
    at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5147) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 44 more 
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'my.app.mail.MailSender' 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:1466) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1097) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1059) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:589) 
    ... 66 more

的@ComponentScan({"my.app"})作品，因为其他类的正确自动装配。

现在，如果我将MailSender2或MailService中的类别MailSender重命名，它将按预期工作。

为什么Spring Boot（1.4.2.RELEASE）不能自动连接这个类？名称MailSender是不能用于自动装配的保留名称吗？

来源

2016-12-14 deve

您还没有登录S.B启动时涉及的问题的信息？ – davidxxx

在上面添加了登录后。 – deve

默认情况下，Spring Boot将使用名称“mailSender”注册它创建的'JavaMailSender'。因为你有一个名为'MailSender'的类，所以bean的名称是'mailSender'，它与自动配置的邮件发送者冲突。只需在@ @ Service（“myMailSender”）这样的'@ Service'中明确指定一个名称即可。 –

在您的控制器中，尝试删除import org.springframework.mail.MailSender或导入其他MailSender（您尝试自动装入的其他MailSender）的等效导入。只需导入您自己的MailSender，自动装配应按预期工作。如果没有，你可以看看@Qualifier注解。

来源

2016-12-14 12:08:43

使用预选赛与您的服务如下：

@Service 
@Qualifier("springBootMailService")

来源

2016-12-14 12:14:56 KayV

Spring Boot Autowire自己的类

回答

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