Spring自动连接失败，没有找到依赖项错误类型的合格bean

Question

这是我的设想。我的项目正在使用Spring(3.2.3.Release)、Struts2(2.3.14.3)和JPA(2.0)。我们有一个包含各种实体和公共类的项目（我们称之为项目a）。我们使用项目A生成一个.jar文件，以便其他项目可以使用这些类。在项目A中，我们使用了Spring原型:@Component。@service或@repository用于我们希望Spring注入的那些类。每当我们尝试从jar中注入bean时，我们都会得到类似于以下内容的错误：

>

找不到依赖项的[com.ceiwc.bc.commonsql.service.CommonsqlService]类型的合格bean：至少需要一个合格的bean作为此依赖项的自动候选项。依赖项注释：{@org.SpringFramework.Beans.Factory.Annotation.AutoWired(required=true)}

无法自动连接字段：private com.ceiwc.bc.commonsql.service.commonsqlservice com.ceiwc.ma.mvc.action.loginaction.commonsqlservice；嵌套异常为org.springframework.beans.factory.NoSuchBeanDefinitionException：未找到依赖项得[com.ceiwc.bc.CommonSql.Service.CommonSqlService]类型得合格bean：需要至少一个符合此依赖项自动候选条件得bean.依赖项注释：{@org.SpringFramework.Beans.Factory.Annotation.AutoWired(required=true)}

创建名为“com.ceiwc.ma.mvc.action.LoginAction”的bean时出错：注入autowired依赖项失败；嵌套异常为org.springframework.beans.factory.beanCreationException：无法自动连接字段：private com.ceiwc.bc.commonsql.service.commonsqlservice com.ceiwc.ma.mvc.action.loginaction.commonsqlservice；嵌套异常为org.springframework.beans.factory.NoSuchBeanDefinitionException：未找到依赖项得[com.ceiwc.bc.CommonSql.Service.CommonSqlService]类型得合格bean：需要至少一个符合此依赖项自动候选条件得bean.依赖项注释：{@org.SpringFramework.Beans.Factory.Annotation.AutoWired(required=true)}

无法实例化为命名空间“/login”中的“do login”定义的操作com.ceiwc.ma.mvc.Action.loginAction错误创建名为“com.ceiwc.ma.mvc.Action.loginAction”的bean：注入autowired依赖项失败；嵌套异常为org.springframework.beans.factory.beanCreationException：无法自动连接字段：private com.ceiwc.bc.commonsql.service.commonsqlservice com.ceiwc.ma.mvc.action.loginaction.commonsqlservice；嵌套异常为org.springframework.beans.factory.NoSuchBeanDefinitionException：未找到依赖项得[com.ceiwc.bc.CommonSql.Service.CommonSqlService]类型得合格bean：需要至少一个符合此依赖项自动候选条件得bean.依赖项注释：{@org.SpringFramework.Beans.Factory.Annotation.AutoWired(required=true)}

我们正在为Spring使用Java配置。下面是我们的配置类：

package com.zzz.bc.config;

@Configuration
@ImportResource({"/WEB-INF/spring/spring-config.xml"})
@ComponentScan(basePackages = "com.zzz")
public class ApplicationConfig {
    @Bean
    public JavaMailSender mailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost(${app.mail.host});
        return mailSender;
    }
}

package com.zzz.bc.config;

@Configuration
@EnableTransactionManagement
@Import(ApplicationConfig.class)
@PropertySource({"classpath:db.properties"})
public class DataConfig {

    @Autowired
    Environment environment;

    @Bean
    public PlatformTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
        return transactionManager;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
        String[] packagesToScan =
                {environment.getProperty("db.packagesToScan1"), environment.getProperty("db.packagesToScan2")};

        Map<String, Object> jpaProperties = new HashMap<String, Object>();
        jpaProperties.put("eclipselink.weaving", "false");

        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPackagesToScan(packagesToScan);
        entityManagerFactoryBean.setLoadTimeWeaver(new InstrumentationLoadTimeWeaver());
        entityManagerFactoryBean.setJpaVendorAdapter(vendorAdapter());
        entityManagerFactoryBean.setJpaPropertyMap(jpaProperties);

        return entityManagerFactoryBean;
    }

    @Bean
    public DriverManagerDataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getProperty("db.driver"));
        dataSource.setUrl(environment.getProperty("db.url"));
        dataSource.setUsername(environment.getProperty("db.username"));
        dataSource.setPassword(environment.getProperty("db.password"));
        return dataSource;
    }

    @Bean
    public JpaVendorAdapter vendorAdapter() {
        EclipseLinkJpaVendorAdapter vendorAdapter = new EclipseLinkJpaVendorAdapter();
        vendorAdapter.setDatabase(Database.ORACLE);
        vendorAdapter.setShowSql(true);
        return vendorAdapter;
    }

    @Bean
    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

我们将@ComponentScan设置为检查com.zzz包中的bean。在项目B中，我们有一个Struts2动作，希望从项目a中注入一个bean。这里是项目B中的类的一个片段：

@SuppressWarnings("rawtypes")
@Service("CommonSQLService")
public class CommonSQLServiceImpl implements CommonSQLService {

    @Autowired
    CommonSQLDao cdao;

    @Override
    public Policy getPolicyById(String policyNo) {
        return cdao.getPolicyById(policyNo);
    }

    @Override
    public Policy getPolicy(Policy parmRec) {
        return cdao.getPolicy(parmRec);
    }

    @Override
    public ArrayList<Policy> getPolicies(String policyNo) {
        return cdao.getPolicies(policyNo);
    }
    @Override
     public List<Policy> getPolicies(Policy parmRec){
        return cdao.getPolicies(parmRec);
    }
}

package com.zzz.ma.mvc.action;

@SuppressWarnings("serial")
@Component
@Scope("prototype")
@Namespace("/Login")
public class LoginAction extends ActionParent {
    @Autowired
    private IUserService userService; //Contained in project B

    @Autowired
    private CommonSQLService commonSQLService; //What's autowired from project A

    private User user;
    private String updateFlag;
    private Integer parentMenuId;
    private IwifWebNavmenuItem record;

    public static final String LOGIN_STR = "login";

    @Action(value = "doLogin", results = { @Result(name = "success", location = "/pages/login.jsp") })
    public String login() {
        updateFlag = "Y";
        return SUCCESS;
    }

    @Action(value = "validate", results = {
            @Result(name = "success", location = "/BrowseOptions/showOptions", type = "redirect"),
            @Result(name = "login", location = "/pages/login.jsp") })
    public String validateUser() {
        if (updateFlag == null) {
            session.remove(LOGIN_STR);
            return LOGIN;
        }

        if (userService.validateUser(user.getUsername(), user.getPassword()) == null) {
            addActionError(getText("invalid.user"));
            return LOGIN;
        }

        session.put(LOGIN_STR, user.getUsername());

        return SUCCESS;
    }

    @Action(value = "logout", results = { @Result(name = "success", location = "/pages/login.jsp") })
    public String logout() {
        updateFlag = StringUtils.EMPTY;
        session.invalidate();

        return SUCCESS;
    }
}

每当我们尝试执行此自动连接时，我们都会遇到上面所列的错误。我们错过了什么？不能自动连线包含在带有Spring构造型的jar文件中的类吗？

谢谢你提前帮我！

Answer 1

将@service（“CommonSQLService”）更改为@service（“CommonSQLService”），或者如果您没有在其他任何地方实现CommonSQLService接口，则可以只使用@service。