彈簧自動裝配Autowired服務集合上部署，而是叫時的空

很抱歉，如果我惹了我的問題，我剛入門配置MVC，春，等....彈簧自動裝配Autowired服務集合上部署，而是叫時的空

，我運行到是問題在我的Spring MVC項目中，當我的應用程序部署時（通過在Spring Tool Suite中設置斷點進行驗證），我的所有Autowired服務都已成功自動裝入，但是當我嘗試調用自動裝入服務的方法時，我遇到了NullPointerException。我在不同的配置文件中查看了所有的東西，看起來像我的servelt環境，根環境和web XML文件應該沒問題（不要引用我的意思，它們包含在下面）。

我想知道如果我不調用在部署時創建的服務實例？看起來很奇怪的是Autowired setter可以被成功調用，但是這些服務最終都是空的。任何幫助，您可以提供非常感謝！

根context.xml中：

<?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:context="http://www.springframework.org/schema/context" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx" 
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd 
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"> 
<bean id="sessionFactory" 
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
    <property name="dataSource" ref="dataSource"></property> 
    <property name="hibernateProperties"> 
     <props> 
      <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect 
      </prop> 
      <prop key="hibernate.show_sql">true</prop> 
     </props> 
    </property> 
    <property name="packagesToScan" value="com.byteslounge.spring.tx.model" /> 
</bean> 

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
    destroy-method="close"> 
    <property name="driverClassName" value="oracle.jdbc.driver.OracleDrive" /> 
    <property name="url" 
     value="jdbc:oracle:thin:@**********" /> 
    <property name="username" value="*******" /> 
    <property name="password" value="*******" /> 
</bean> 

<bean id="transactionManager" 
    class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
    <property name="dataSource" ref="dataSource" /> 
    <property name="sessionFactory" ref="sessionFactory" /> 
</bean> 

<tx:annotation-driven /> 

<context:annotation-config /> 

<bean 
    class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" /> 

<context:component-scan base-package="com.clm.billing" />

的servelt-context.xml中：

<?xml version="1.0" encoding="UTF-8"?> 
<beans:beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:beans="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd 
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> 

    <!-- DispatcherServlet Context: defines this servlet's request-processing 
     infrastructure --> 

    <!-- Enables the Spring MVC @Controller programming model --> 
    <mvc:annotation-driven /> 

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving 
     up static resources in the ${webappRoot}/resources directory --> 
    <mvc:resources mapping="/resources/**" location="/resources/" /> 

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources 
     in the /WEB-INF/views directory --> 
    <beans:bean 
     class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <beans:property name="prefix" value="/WEB-INF/views/" /> 
     <beans:property name="suffix" value=".jsp" /> 
    </beans:bean> 

</beans:beans>

web.xml中：

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> 
    <context-param> 
    <param-name>contextConfigLocation</param-name> 
    <param-value>/WEB-INF/spring/root-context.xml</param-value> 
    </context-param> 
    <listener> 
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 
    <servlet> 
    <servlet-name>appServlet</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
    <init-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>appServlet</servlet-name> 
    <url-pattern>/</url-pattern> 
    </servlet-mapping> 
    <servlet> 
    <description></description> 
    <display-name>OrderList</display-name> 
    <servlet-name>OrderList</servlet-name> 
    <servlet-class>com.clm.billing.Oracle.OrderList</servlet-class> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>OrderList</servlet-name> 
    <url-pattern>/OrderList</url-pattern> 
    </servlet-mapping> 
    <servlet> 
    <description></description> 
    <display-name>EditBilling</display-name> 
    <servlet-name>EditBilling</servlet-name> 
    <servlet-class>com.clm.billing.EditBilling</servlet-class> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>EditBilling</servlet-name> 
    <url-pattern>/EditBilling</url-pattern> 
    </servlet-mapping> 
    <servlet> 
    <description></description> 
    <display-name>UpdateBilling</display-name> 
    <servlet-name>UpdateBilling</servlet-name> 
    <servlet-class>com.clm.billing.UpdateBilling</servlet-class> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>UpdateBilling</servlet-name> 
    <url-pattern>/UpdateBilling</url-pattern> 
    </servlet-mapping> 
</web-app>

InsuranceNoteDBServiceImpl：（這裏日ËsetiNoteDAO被稱爲與iNoteDAO類的實例，但是當getNoteById被稱爲iNoteDAO爲null）

@Service 
public class InsuranceNoteDBServiceImpl implements InsuranceNoteDBService { 

    private InsuranceNoteDAO iNoteDAO; 

    @Autowired 
    public void setiNoteDAO(InsuranceNoteDAO iNoteDAO) { 
     this.iNoteDAO = iNoteDAO; 
    } 

    @Override 
    @Transactional 
    public void insertNote(BillerNote note) { 
     iNoteDAO.insertNote(note); 

    } 

    @Override 
    @Transactional 
    public BillerNote getNoteById(int noteId) { 
     return iNoteDAO.getNoteById(noteId); 
    } 

}

InsuranceNoteDBService：

public interface InsuranceNoteDBService { 

    void insertNote(BillerNote note); 

    BillerNote getNoteById(int noteId); 

}

InsuranceNoteDAOImpl：（同樣的事情發生在這裏使用init（）方法被設置會話工廠）

@Service 
public class InsuranceNoteDAOImpl implements InsuranceNoteDAO { 

    public SessionFactory sessionFactory; 

    @Autowired 
    public void init(SessionFactory factory) { 
     setSessionFactory(factory); 
    } 

    public void setSessionFactory(SessionFactory factory) { 
     this.sessionFactory = factory; 
    } 

    @Override 
    public void insertNote(BillerNote note) { 
     sessionFactory.getCurrentSession().save(note); 
    } 

    @Override 
    public BillerNote getNoteById(int noteId) { 
     return (BillerNote) sessionFactory. 
        getCurrentSession(). 
        get(BillerNote.class, noteId); 
    } 

}

InsuranceNoteDAO：

public interface InsuranceNoteDAO { 

    void insertNote(BillerNote note); 

    BillerNote getNoteById(int noteId); 

}

來源

2013-06-19 grahamcr

爲iNodeDao的制定者似乎不正確。它應該是setINodeDao。你是自動生成二傳手還是手工編寫的？ –

@VaibhavRaj - 我用手寫了它，而不是讓STS生成它，但名稱應該不重要，它正在使用InsuranceNoteDAO實例調用。 – grahamcr

@TheNewIdiot - 我不應該在spring上下文xml中定義bean，它們應該由Spring的預處理器根據賦予類的註釋來提取。這是由 – grahamcr

刪除init方法和註釋二傳手：

@Autowired 
public void setSessionFactory(SessionFactory factory) { 
    this.sessionFactory = factory; 
}

來源

2013-06-19 16:22:02 NimChimpsky

謝謝您的建議！我像你說的那樣刪除了init方法，並用@Autowired註釋了setter，但仍然和以前一樣。 – grahamcr

彈簧自動裝配Autowired服務集合上部署，而是叫時的空

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