Spring - @Autowireing 存储库不起作用。 @Autowireing 其他类可以

Question

我正在尝试自动装配存储库，但它拒绝工作。我已经为此苦苦挣扎了一个星期，但我似乎无法弄清楚。有趣的是，当我注释掉人员存储库的自动装配时，程序可以正常工作并正确编译，但是一旦我尝试自动装配人员存储库，我就会收到此错误（我省略了大部分错误，因为我无法发布所有it) 这里是个例外，我的课在它下面。

HTTP Status 500 - Servlet.init() for servlet appServlet threw exception

type Exception report

message Servlet.init() for servlet appServlet threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet appServlet threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    java.lang.Thread.run(Thread.java:722)

root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.mycompany.smsdatabase.service.PersonImport com.mycompany.smsdatabase.controller.HomeController.personImport; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personImport': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.mycompany.smsdatabase.repositories.PersonRepository com.mycompany.smsdatabase.service.PersonImport.PersonRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.mycompany.smsdatabase.repositories.PersonRepository] 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)}
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:287)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:631)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:588)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:645)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:508)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:449)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:133)
    javax.servlet.GenericServlet.init(GenericServlet.java:160)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    java.lang.Thread.run(Thread.java:722)

这是我正在使用的课程。

package com.mycompany.smsdatabase.controller;

import com.mycompany.smsdatabase.service.PersonImport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class HomeController {
   @Autowired
   PersonImport personImport;

   @RequestMapping(value = "/", method = RequestMethod.GET)
    public String Home()
    {
      personImport.doImportPerson("anthony");
      return "index";
    }
}

package com.mycompany.smsdatabase.service;
import com.mycompany.smsdatabase.domain.Person;
import com.mycompany.smsdatabase.repositories.PersonRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional
public class PersonImport  {

@Autowired
private PersonRepository PersonRepository;

 public Person doImportPerson( String id)
 {   
  Person person = PersonRepository.findById(id);
  if (person == null) {
    person = new Person(id,"anthony");
     }
   PersonRepository.save(person);
     System.out.println("inside doImportPerson");
     return person;
 }
}
package com.mycompany.smsdatabase.repositories;

import com.mycompany.smsdatabase.domain.Person;
import org.springframework.data.neo4j.repository.GraphRepository;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
public interface PersonRepository extends GraphRepository<Person>{
    Person findById(String id);
}

我省略了 person 类，因为它只是一个节点实体类。

这也是我的应用程序上下文 xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<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"
       xmlns:neo4j="http://www.springframework.org/schema/data/neo4j"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
    http://www.springframework.org/schema/data/neo4j
    http://www.springframework.org/schema/data/neo4j/spring-neo4j.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd">

    <mvc:annotation-driven />

    <context:component-scan base-package="com.mycompany.smsdatabase">
    </context:component-scan>

    <context:spring-configured/>
    <neo4j:config storeDirectory="target/data/graph.db"/>
    <neo4j:repositories base-package="com.mycompany.smsdatabase"/>

    <bean id="graphDatabaseService" class="org.neo4j.test.ImpermanentGraphDatabase" destroy-method="shutdown"/>
    <tx:annotation-driven mode="proxy"/>

</beans>

Answer 1

你的 spring 配置错误：

你的配置中有<neo4j:repositories base-package="com.mycompany.smsdatabase"/>

但是你的 java 代码中的导入是

import com.mycompany.smsdatabase.repositories.PersonRepository;

您应该将您的 spring 配置更正为

<neo4j:repositories base-package="com.mycompany.smsdatabase.repositories"/>

Answer 2

您应该在应用程序上下文文件中为带有@AutoWired 注释的变量定义相应的bean，即

<bean id="personRepository" class="com.mycompany.smsdatabase.repositories.PersonRepository"/>
<bean id="personImport" class="com.mycompany.smsdatabase.service.PersonImport"/>