Spring-data cassandra tomcat webapp - 無法自動裝載CassandraOperations

Question

啓動webapp時出現以下錯誤。我試圖閱讀Spring Data文檔，但它們並不完整。任何幫助表示讚賞。

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private dao.UserDao controller.LoginController.userDao; nested exception is  org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [dao.UserDao] 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)} 
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:555) 
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) 
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) 
... 56 more 

下面是我的項目的詳細信息：

 
**Structure** 
src 
main 
    java 
    bean 
     Person.java 
    configuration 
     ApplicationConfiguration 
     CassandraConfiguration  
    controller 
     LoginController 
    dao 
     UserDao 

contextClass org.springframework.web.context.support.AnnotationConfigWebApplicationContext

<context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>configuration.ApplicationConfiguration</param-value> 
    </context-param> 



    <servlet> 
     <servlet-name>applicationContext</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <init-param> 
      <param-name>contextClass</param-name> 
      <param-value> 
       org.springframework.web.context.support.AnnotationConfigWebApplicationContext 
      </param-value> 
     </init-param> 
     <init-param> 
      <param-name>contextConfigLocation</param-name> 
      <param-value>configuration</param-value> 
     </init-param> 
    </servlet> 

    <servlet-mapping> 
     <servlet-name>applicationContext</servlet-name> 
     <url-pattern>*.do</url-pattern> 
    </servlet-mapping> 

    <listener> 
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 


    <context-param> 
     <param-name>log4jConfigLocation</param-name> 
     <param-value>WEB-INF/log4j.xml</param-value> 
    </context-param> 

ApplicationConfiguration.java

@Configuration 
@ComponentScan(basePackages = "controller, dao") 
@EnableWebMvc 

public class ApplicationConfiguration { 

private static final Logger LOG = LoggerFactory.getLogger(ApplicationConfiguration.class); 

    @Bean 
    public User user() { 
     return new User(); 
    } 
    @Autowired 
    private CassandraOperations cassandraOps; 

    @Bean 
    TilesViewResolver viewResolver(){ 
     TilesViewResolver viewResolver = new TilesViewResolver(); 
     return viewResolver; 
    } 

    @Bean 
    TilesConfigurer tilesConfigurer(){ 
     TilesConfigurer tilesConfigurer = new TilesConfigurer(); 
     tilesConfigurer.setDefinitions("WEB-INF/tiles-definitions.xml"); 
     tilesConfigurer.setPreparerFactoryClass(org.springframework.web.servlet.view.tiles3.SpringBeanPreparerFactory 
      .class); 
     return tilesConfigurer; 
    } 
} 

CassandraConfiguration.java

@Configuration 
@PropertySource(value = { "classpath:cassandra.properties" }) 
@EnableCassandraRepositories(basePackages = { "dao" }) 
public class CassandraConfiguration { 

    private static final Logger LOG = LoggerFactory.getLogger(CassandraConfiguration.class); 
    @Autowired 
    private Environment env; 

    @Bean 
    public CassandraClusterFactoryBean cluster() { 

     CassandraClusterFactoryBean cluster = new CassandraClusterFactoryBean(); 
     cluster.setContactPoints(env.getProperty("cassandra.contactpoints")); 
     cluster.setPort(Integer.parseInt(env.getProperty("cassandra.port"))); 

     return cluster; 
    } 

    @Bean 
    public CassandraMappingContext mappingContext() { 
     return new BasicCassandraMappingContext(); 
    } 

    @Bean 
    public CassandraConverter converter() { 
     return new MappingCassandraConverter(mappingContext()); 
    } 

    @Bean 
    public CassandraSessionFactoryBean session() throws Exception { 

     CassandraSessionFactoryBean session = new CassandraSessionFactoryBean(); 
     session.setCluster(cluster().getObject()); 
     session.setKeyspaceName(env.getProperty("cassandra.keyspace")); 
     session.setConverter(converter()); 
     session.setSchemaAction(SchemaAction.NONE); 

     return session; 
    } 

    public CassandraOperations cassandraTemplate() throws Exception { 
     return new CassandraTemplate(session().getObject()); 
    } 

的LoginController

@Controller 
public class LoginController { 
    private final static Logger logger = Logger.getLogger(LoginController.class); 

    @Autowired 
    private UserDao userDao; 

    @RequestMapping(value = Constants.WEBAPP_CONTEXT + "/login.do", method = RequestMethod.GET) 
    public ModelAndView login() { 
     userDao.addUser(); 
     return new ModelAndView("login-tile"); 
    } 
    } 

userDAO的 @Repository（ 「userDAO的」） 公共類的UserDAO {

public static final String TIME_BUCKET = "2014-01-01"; 

    @Autowired 
    private CassandraOperations cassandraOps; 

    public void addUser() { 
     cassandraOps.insert(new Person("1234567890", "David", 40)); 
    } 
} 

Answer 1

你需要把一個@Bean註釋在您的CassandraConfiguration類中定義了定義。否則，它不會被實例化爲一個bean，並且Spring不能自動裝載它。

喜歡這個樣本：

@Bean <--- 
public CassandraOperations cassandraTemplate() throws Exception { 
    return new CassandraTemplate(session().getObject()); 
}