Spring定义了类文件在另一个jar中的bean

Question

我的项目（Maven项目）包括三个模块：sr-web，sr-domain和sr-dao，就像这样：

SR ----      |      ---- SR-域      |      ---- SR-道      |      ---- SR-网络

在域模块中，我定义了我的实体，在dao模块中，我定义了扩展org.springframework.data.repository.PagingAndSortingRepository的相关DAO接口 和

org.springframework.data.jpa.repository.JpaSpecificationExecutor

但是当我在sr-web模块的applicationContext.xml中定义Dao bean时，我得到了异常：

UnsatisfiedDependencyException: Error creating bean with name 'accountService': Unsatisfied dependency expressed through method 'setUserDao' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'edu.whu.irlab.scholarreader.dao.repository.UserDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:671)
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.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351)
... 77 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'edu.whu.irlab.scholarreader.dao.repository.UserDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    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)

在sr-web模块中，我的applicationContext.xml是这样的：

<bean id="authorDao" class="edu.whu.irlab.scholarreader.dao.repository.AuthorDao" abstract="true"/>
    <bean id="journalDao" class="edu.whu.irlab.scholarreader.dao.repository.JournalDao" abstract="true"/>
    <bean id="keywordDao" class="edu.whu.irlab.scholarreader.dao.repository.KeywordDao" abstract="true"/>
    <bean id="paperDao" class="edu.whu.irlab.scholarreader.dao.repository.PaperDao" abstract="true"/>
    <bean id="referenceDao" class="edu.whu.irlab.scholarreader.dao.repository.ReferenceDao" abstract="true"/>
    <bean id="taskDao" class="edu.whu.irlab.scholarreader.dao.repository.TaskDao" abstract="true"/>
    <bean id="userDao" class="edu.whu.irlab.scholarreader.dao.repository.UserDao" abstract="true"/>

然后如何在sr-web模块中定义我的Dao bean？