Java Spring 控制器中的自动装配 bean 注入

Question

提问by user3321738

Not able to figure out, what's wrong. I keep getting the same error again and again. I have searched Google but failed to solve this issue. I was looking the same post over here try to solve but still the same.

想不通，怎么回事。我一次又一次地收到同样的错误。我已经搜索过谷歌，但未能解决这个问题。我在这里寻找相同的帖子尝试解决但仍然相同。

JobsDAOImp.java

作业DAOImp.java

public class JobsDAOImp implements JobsDAO {

    @Autowired 
    private SessionFactory sessionFactory;
        ..        
}

JobService.java

作业服务.java

public interface JobsService {
       ....
}

JobServiceImp.java

作业服务Imp.java

@Service
@Transactional(readOnly=true)
public class JobsServiceImp implements JobsService {

    @Autowired private JobsDAOImp jobsDAOImp;
        ..
}

JobsController.java

作业控制器.java

@Controller
@RequestMapping(value="/")
public class JobsController {

    @Autowired
    private JobsService jobsService;
            ...
}

spring.xml

弹簧文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">

        <context:annotation-config/>        

        <!-- DAO Implementations -->
        <bean id="usersImp" class="org.delance.daoimplementation.UsersImp" />
        <bean id="jobsDAOImp" class="org.delance.daoimplementation.JobsDAOImp" />

        <!-- Service Implementations -->
        <bean id="jobsServiceImp" class="org.delance.serviceimp.JobsServiceImp" />  

        <bean id="dataSource" class="${jdbc.dataSource}" destroy-method="close">
               <property name="driverClass" value="${jdbc.driverClass}"/>
               <property name="jdbcUrl" value="${jdbc.jdbcUrl}"/>
               <property name="user" value="${jdbc.user}"/>
               <property name="password" value="${jdbc.password}"/>
               <property name="maxStatements" value="${jdbc.maxStatements}"/>

               <property name="acquireIncrement" value="${jdbc.acquireIncrement}" />                   

               <property name="idleConnectionTestPeriod" value="${jdbc.idleConnectionTestPeriod}" />  
               <property name="checkoutTimeout" value="${jdbc.checkoutTimeout}" /> 
               <property name="unreturnedConnectionTimeout" value="${jdbc.unreturnedConnectionTimeout}" /> 
               <property name="maxPoolSize" value="${jdbc.maxPoolSize}" />
               <property name="minPoolSize" value="${jdbc.minPoolSize}" />
               <property name="automaticTestTable" value="${jdbc.automaticTestTable}" /> 
               <property name="testConnectionOnCheckin" value="${jdbc.testConnectionOnCheckin}" />                 
        </bean>

        <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" >
               <property name="dataSource" ref="dataSource"/>

               <property name="packagesToScan">
                            <array>
                               <value>org.delance.models</value>
                            </array>
               </property>               

               <property name="hibernateProperties">
                 <value>
                   hibernate.dialect = org.hibernate.dialect.MySQLDialect
                   hibernate.cache.provider_class = org.hibernate.cache.NoCacheProvider
                   hibernate.show_sql = true
                   hibernate.hbm2ddl.auto = create
                 </value>
               </property>               

        </bean>                

        <context:property-placeholder location="application.properties" />
</beans>

mvc-dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <mvc:annotation-driven />

    <context:component-scan base-package="org.delance" />

    <bean id="multipartResolver"
           class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

    <mvc:resources mapping="/**" location="/" />            

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="cacheSeconds" value="0" />
    </bean>

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

</beans>

getting this issue :-

得到这个问题：-

    SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobsController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.delenace.service.JobsService org.delenace.controllers.JobsController.jobsService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.delenace.service.JobsService] 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:289)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:656)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1635)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.delenace.service.JobsService org.delenace.controllers.JobsController.jobsService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.delenace.service.JobsService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:517)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
    ... 26 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.delenace.service.JobsService] 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:988)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:858)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:489)
    ... 28 more

Feb 18, 2014 5:01:17 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobsController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.delenace.service.JobsService org.delenace.controllers.JobsController.jobsService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.delenace.service.JobsService] 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:289)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:656)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1635)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.delenace.service.JobsService org.delenace.controllers.JobsController.jobsService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.delenace.service.JobsService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:517)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
    ... 26 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.delenace.service.JobsService] 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:988)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:858)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:489)
    ... 28 more

Answer 1

回答by René Link

Use the interface instead of the implementation in the JobsControllersince spring generates a java proxy for the JobServiceImplbean and java Proxies are based on interfaces.

使用接口而不是实现，JobsController因为 spring 为JobServiceImplbean生成 java 代理，而 java 代理基于接口。

 @Autowired
 private JobsService jobsService;

Answer 2

回答by Boyan

I don't see your whole project and what's the exact configuration, but it seems to me that you are loading only mvc-dispatcher-servlet.xml without spring.xml. In your case this is OK because you have defined

我没有看到你的整个项目以及确切的配置，但在我看来你只加载了 mvc-dispatcher-servlet.xml 而没有 spring.xml。在您的情况下，这是可以的，因为您已经定义了

<context:component-scan base-package="org.delance" />

to scan for bean definitions. So assuming you have only the mvc-dispatcher-servlet.xml loaded, you should check that both of the controller and service are in a package that has this common base package "org.delance" or otherwise spring classpath scanning won't pick them up. Also you should get rid of the qualifier - this is in case you have two or more beans of given type. Anyway I have had this kind of problems before and I am sure it will be something small.

扫描 bean 定义。因此，假设您只加载了 mvc-dispatcher-servlet.xml，您应该检查控制器和服务是否都在具有此公共基础包“org.delance”的包中，否则 spring 类路径扫描不会选择它们向上。此外，您应该摆脱限定符 - 这是为了防止您有两个或多个给定类型的 bean。无论如何，我以前遇到过这种问题，我相信这会是一些小问题。

Regarding tha fact you have 2 configurations (or also contexts) there's something more you have to consider. You shouldn't define one bean twice (once through package scanning and second time in the xml config), except when this is done intentionally. Having this said if you fix this first issue you'll have other problems when you load both of the contexts (spring.xml and mvc-dispatcher-servlet.xm)

关于您有 2 个配置（或上下文）的事实，您还需要考虑更多内容。您不应该两次定义一个 bean（一次是通过包扫描，第二次是在 xml 配置中），除非这是有意完成的。话虽如此，如果您解决了第一个问题，则在加载两个上下文（spring.xml 和 mvc-dispatcher-servlet.xm）时还会遇到其他问题

Answer 3

回答by Dhinesh Rathinam

You need make the jobService.java class to be bean specified. Add stereo type annotation to it like @Component.

您需要将 jobService.java 类指定为 bean。像@Component 一样向它添加立体类型注释。

Answer 4

回答by sharePointer

if you use such definition:

如果你使用这样的定义：

<bean id="jobsServiceImp" class="org.delance.serviceimp.JobsServiceImp" />

you are not leveraging Spring Dependency Injection feature, since there is no difference between interface and implementing class; in Spring, you might want to use interfaces throughout the code and declare their implementations in the application context configuration (this is defined as separation of concerns); this is also useful in case you decide to change the implementation because you will just need to change the xml configuration.

您没有利用 Spring 依赖注入功能，因为接口和实现类之间没有区别；在 Spring 中，您可能希望在整个代码中使用接口并在应用程序上下文配置中声明它们的实现（这被定义为关注点分离）；如果您决定更改实现，这也很有用，因为您只需要更改 xml 配置。

Please try the following:

请尝试以下操作：

<bean id="jobsService" class="org.delance.serviceimp.JobsServiceImp" />

Salvatore

萨尔瓦多

Java Spring 控制器中的自动装配 bean 注入

提问by user3321738

回答by René Link

回答by Boyan

回答by Dhinesh Rathinam

回答by sharePointer

相关推荐

最近更新

标签

Java Spring 控制器中的自动装配 bean 注入

提问by user3321738

回答by René Link

回答by Boyan

回答by Dhinesh Rathinam

回答by sharePointer

相关推荐

Java 未检查异常或运行时异常之间的区别

Java -XX:parallelGCThreads = 8 是否与阿姆达尔定律相关的内核数量有关？

Java - 是否有像 instanceof 这样的“subclassof”？

Java 带开关盒的 JOptionPane

相关推荐

最近更新

标签