Spring CrudRepository 对于 @Autowired 成员变量为 null

Question

我是 Spring JPA 的新手。我正在尝试使用 hibernate + Spring JPA。为此，我创建了下面的存储库

package com.raptorservice.da.dal;

import com.raptorservice.da.objects.ClientDO;
import org.springframework.data.repository.CrudRepository;

public interface ClientRepository extends CrudRepository<ClientDO, String> {    
}

下面是我的 spring-ws-servlet.xml，我在其中浏览我的包。

<?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:sws="http://www.springframework.org/schema/web-services"
    xmlns:oxm="http://www.springframework.org/schema/oxm" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans.xsd 
                        http://www.springframework.org/schema/web-services 
                        http://www.springframework.org/schema/web-services/web-services.xsd 
                        http://www.springframework.org/schema/oxm 
                        http://www.springframework.org/schema/oxm/spring-oxm.xsd
                        http://www.springframework.org/schema/jdbc
                        http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
                        http://www.springframework.org/schema/data/jpa
                        http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
                        ">

    <!--  ****************************** BASIC CONFIGURATION ******************************************** -->
    <!-- Enable annotations for end points -->
    <sws:annotation-driven />


    <bean id="getpointsbean" class="com.raptorservice.endpoints.GetPointsEndpoint">
    </bean>

    <sws:dynamic-wsdl id="points" portTypeName="Points" locationUri="/points/" targetNamespace="http://sailin.com/schemas">
        <sws:xsd location="/WEB-INF/xsd/points.xsd" />
    </sws:dynamic-wsdl>

    <!--  Configure JAXB to marshal and un-marshal requests -->
    <oxm:jaxb2-marshaller id="jaxbMarshaller"  contextPath="com.raptorservice.generated" />



    <!-- ******************************* PERSISTANCE CONFIGURATION ****************************************** -->
    <!--  JPA Repositories -->
<jpa:repositories  base-package="com.raptorservice.da.dal" /> 



    <!--  Hibernate Transaction Manager -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/testservice" />
        <property name="username" value="root" />
        <property name="password" value="admin" />
    </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="persistenceXmlLocation" value="./WEB-INF/persistence.xml"></property>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="database" value="MYSQL" />
                <property name="showSql" value="true" />
            </bean>
        </property>
     </bean>


    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
<!--        <property name="configLocation"> -->
<!--            <value>classpath:hibernate.cfg.xml</value> -->
<!--        </property> -->
<!--        <property name="configurationClass"> -->
<!--            <value>org.hibernate.cfg.AnnotationConfiguration</value> -->
<!--        </property> -->
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>



 </beans>

我在 WEB-INF 下也有一个有效的 persistence.xml 文件。

我正在尝试在我的网络服务(@Endpoint)中使用 ClientRepository，如下所示

package com.raptorservice.endpoints;


@Endpoint
public class GetPointsEndpoint {    

    @Autowired
    private ClientRepository clientRepository;

@PayloadRoot(localPart="getPointsForClientAndCustomerRequest", namespace="http://sailin.com/schemas")
    @ResponsePayload()
    public GetPointsForClientAndCustomerResponse getPointsForClientAndCustomerRequest(@RequestPayload GetPointsForClientAndCustomerRequest getpointsRequest) throws Exception
    {
        GetPointsForClientAndCustomerResponse resp = new GetPointsForClientAndCustomerResponse();
        ResultCode resCode = new ResultCode();

        try
        {
        ClientDO client = new ClientDO();
        client.setName("Test1");
        client.setClientId("test111");
        clientRepository.save(client);
        }
        catch(Exception ex)
        {
          System.out.println(ex);
        }


        resCode.setDescription("pass");
        resCode.setCode(BigInteger.valueOf(5));
        resp.setResultCode(resCode);
        return resp;
    }

但是 clientRepository 始终为 null。我缺少什么？为什么 clientRepository 没有自动连接？

我检查了日志，没有发现任何明显的情况。请帮忙。

提前致谢。

Answer 1

我认为 <context:annotation-config/> 丢失了，需要使用此注释在应用程序上下文中注册 AutowiredAnnotationBeanPostProcessor 实例。

如果您使用过，AutowiredAnnotationBeanPostProcessor 也会隐式注册在应用程序上下文中 其 xml 配置中的 <context:component-scan ...> 注释。

参见Difference between <context:annotation-config> vs <context:component-scan>

通常，如果字段值为 null 并且没有发生异常，则意味着该对象不是 Spring bean(在其他地方实例化)，或者它没有由 IoC 容器进行后处理(可能后处理器已在 another context 中注册) )。

由于 bean 是急切初始化的单例，并且 @Autowired 注释的 required 属性默认设置为 true，因此如果 bean 被处理，Spring 很可能会在容器初始化期间抛出异常。