通过方法 'setDelegate' 参数 0 表示的不满足的依赖关系；我能做些什么？答案

【问题标题】：Unsatisfied dependency expressed through method 'setDelegate' parameter 0; What Can I do?通过方法 'setDelegate' 参数 0 表示的不满足的依赖关系；我能做些什么？
【发布时间】：2019-06-10 06:45:52
【问题描述】：

昨天我写了这段代码，现在我得到了以下异常 org.springframework.beans.factory.UnsatisfiedDependencyException 和 org.springframework.beans.factory.NoSuchBeanDefinitionException

这是完整的堆栈跟踪

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'guestbookMapperImpl': Unsatisfied dependency expressed through field 'personMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'personMapperImpl': Unsatisfied dependency expressed through method 'setDelegate' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'personMapperImpl_': Unsatisfied dependency expressed through field 'zipCodeMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'de.zipcode.view.mapper.ZipCodeMapper' 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$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:581)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:367)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1340)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:756)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:409)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4792)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1736)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    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.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:483)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:432)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    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 javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

这是与之配套的代码！

public class PersonMapperDecorater implements PersonMapper {

    private PersonMapper delegate;
    private PersonLanguageService personLanguageService;


    @Autowired
    @Qualifier("delegate")
    public void setDelegate(PersonMapper delegate) {
        this.delegate = delegate;
    }

    @Autowired
    public void setPersonLanguageService(PersonLanguageService personLanguageService) {
        this.personLanguageService = personLanguageService;
    }

    @Override
    public PersonDTO toDTO(Person person) {
        PersonDTO personDTO = delegate.toDTO(person);

        personDTO.setPersonLanguageDTOList(personLanguageService.getPersonLanguageDTOsByPersonId(person.getId()));

        return personDTO;
    }

    @Override
    public Person toEntity(PersonDTO personDTO) {
        return delegate.toEntity(personDTO);
    }

    @Override
    public void copyDTO(PersonDTO sourcePersonDTO, PersonDTO targetPersonDTO) {
        delegate.copyDTO(sourcePersonDTO, targetPersonDTO);
    }

    @Override
    public void copyEntity(Person sourcePerson, Person targetPerson) {
        delegate.copyEntity(sourcePerson, targetPerson);
    }
}

【问题讨论】：

从错误消息中，您正在尝试在某处自动装配一个无法注入的 de.zipcode.view.mapper.ZipCodeMapper 对象（可能在 ZipCodeMapper 类中缺少 Spring 注释）。

标签： java spring dependencies javabeans mapstruct

【解决方案1】：

您的错误信息如下：

没有可用的“de.zipcode.view.mapper.ZipCodeMapper”类型的合格 bean：预计至少有 1 个有资格作为自动装配候选者的 bean。

所以问题就在这里：

@Autowired
@Qualifier("delegate")
public void setDelegate(PersonMapper delegate) {
    this.delegate = delegate;
}

您正在尝试在 PersonMapper 中进行自动装配，但尚未指定符合条件的 bean。您需要为PersonMapper 配置一个@Bean，以便Spring 可以注入它或使用@Component（或任何扩展原型）注释您的PersonMapper（或扩展它的类）

【讨论】：

【解决方案2】：

问题已解决

问题是我没写

(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.ERROR)

在我尝试使用的每个映射器中！

现在我重建项目并开始了:)

【讨论】：