升级Spring到3.2.9适配Java8时Autowired依赖注入失败求助

为适配Java 8，我将Spring库升级至3.2.9版本，目前遇到如下报错：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'acsManagerImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private net.taxstream.acs.repository.LdapDAO net.taxstream.acs.service.AcsManagerImpl.ldapDao; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ldapDao' defined in ServletContext resource [/WEB-INF/caa-servlet.xml]: Cannot resolve reference to bean 'ldapTemplate' while setting bean property 'ldapTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ldapTemplate' defined in ServletContext resource [/WEB-INF/caa-servlet.xml]: Cannot resolve reference to bean 'contextSource' while setting bean property 'contextSource'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'contextSource' is defined

相关代码及配置 #

AcsManagerImpl类 #

@Service
public class AcsManagerImpl implements AcsManager {

    @Autowired
    private AcsRepository acsRepository;
    
    @Autowired
    private LdapDAO ldapDao;

    /**
     * @param acsRepository the acsRepository to set
     */
    public void setAcsRepository(AcsRepository acsRepository) {
        this.acsRepository = acsRepository;
    }

    public <T extends Serializable> Page<T> getComponent(Class<T> type, Pageable pageable) {
        return acsRepository.getComponent(type, pageable);
    }

}

LdapDAO接口 #

public interface LdapDAO<E> {

    List<E> getUserInfo(final String uid);

    List<E> searchUsers(final String uid);

    void setFilter(final String filter);

    void setAttributes(final String[] attrs);
}

caa-servlet.xml配置片段 #

<bean id="ldapTemplate" class="org.springframework.ldap.core.LdapTemplate" 
       p:contextSource-ref="contextSource" 
       p:ignorePartialResultException="true" 
    />
    
    <bean id="ldapDao" class="net.acs.repository.LdapDaoImpl"> 
       <property name="ldapTemplate" ref="ldapTemplate" /> 
       <property name="filter" value="(uid=@)" />
       <property name="attributes">
           <list>
               <value>cn</value>
               <value>mail</value>
               <value>uid</value>
               <value>givenname</value>
               <value>sn</value>
           </list>
       </property> 
   </bean>

applicationContext.xml配置片段 #

<bean id="contextSource" class="org.springframework.ldap.core.support.LdapContextSource">
       
       <property name="url" value="ldap://C5QSQ13:10389/" />
       <property name="base" value="ou=people,o=sevenSeas" />
        <property name="anonymousReadOnly" value="true" />
    </bean>

核心问题分析 #

报错根源是：NoSuchBeanDefinitionException: No bean named 'contextSource' is defined，即caa-servlet.xml所在的Servlet上下文无法找到定义在applicationContext.xml中的contextSource Bean。

解决思路 #

• 检查applicationContext.xml加载配置：确认web.xml中已配置ContextLoaderListener，且contextConfigLocation参数正确指向applicationContext.xml，确保根上下文被正确初始化。示例配置：

  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/applicationContext.xml</param-value>
  </context-param>
  

• 验证上下文层级权限：Spring Web应用中，Servlet上下文是根上下文的子上下文，子上下文可访问根上下文Bean，若无法访问需排查配置冲突或加载顺序问题。
• 检查contextSource Bean定义：确认applicationContext.xml中contextSource的id拼写无误、类路径正确，无XML语法错误导致Bean无法创建。
• 临时测试定位问题：将contextSource的Bean定义临时复制到caa-servlet.xml中，若报错消失，说明是根上下文加载问题，需重点排查web.xml配置。

内容的提问来源于stack exchange，提问作者redds1