如何在多servlet web服務中配置Spring bean

我有一個帶有兩個webservices的java項目，第一項工作正常，spring bean是@Autowired並按預期工作。我嘗試在澤西服務中使用相同的bean，並得到一個來自DAO的空指針異常。代碼如下，請幫忙！如何在多servlet web服務中配置Spring bean

Web.xml中

<servlet> 
    <servlet-name>spring</servlet-name> 
    <servlet-class> 
     org.springframework.web.servlet.DispatcherServlet 
    </servlet-class> 
    <init-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>classpath:applicationContext.xml</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
</servlet> 
<servlet-mapping> 
    <servlet-name>spring</servlet-name> 
    <url-pattern>/sprservice/*</url-pattern> 
</servlet-mapping> 

<servlet> 
    <servlet-name>jersey-services</servlet-name> 
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> 
    <init-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>classpath:applicationContext.xml</param-value> 
    </init-param> 
    <init-param> 
     <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name> 
     <param-value>true</param-value> 
    </init-param> 
    <init-param> 
    <param-name>com.sun.jersey.config.property.packages</param-name> 
    <param-value>com.mypackage</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
    </servlet> 
<servlet-mapping> 
<servlet-name>jersey-services</servlet-name> 
<url-pattern>/services/*</url-pattern> 
</servlet-mapping>

應用的context.xml

<context:annotation-config /> 
<context:component-scan base-package="com.mypackage"/> 
<mvc:annotation-driven/> 

<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> 
    <property name="prefix" value="/WEB-INF/jsp/" /> 
    <property name="suffix" value=".jsp" /> 
</bean> 

<tx:annotation-driven /> 
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> 
    <property name="entityManagerFactory" ref="entityManagerFactory" /> 
    <property name="dataSource" ref="dataSource"/> 
</bean> 
<bean id="mywebservice" class="com.mypackage.webservice.Webservice"> 
</bean> 

<beans profile="default"> 
    <jdbc:embedded-database id="dataSource"/>   
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="dataSource" ref="dataSource"/> 
     <property name="jpaVendorAdapter"> 
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/> 
     </property> 
     <property name="jpaProperties"> 
      <props> 
       <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop> 
       <prop key="hibernate.hbm2ddl.auto">create</prop> 
      </props> 
     </property> 
    </bean> 
</beans> 

<beans profile="prod"> 
    <bean class="java.net.URI" id="dbUrl"> 
     <constructor-arg value="****"/> 
    </bean> 

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
     <property name="driverClassName" value="com.mysql.jdbc.Driver"/> 
     <property name="url" value="*****"/> 
     <property name="username" value="******"/> 
     <property name="password" value="******"/> 
    </bean> 

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="dataSource" ref="dataSource"/> 
     <property name="jpaVendorAdapter"> 
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/> 
     </property> 
     <property name="jpaProperties"> 
      <props> 
       <prop key="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</prop> 
       <prop key="hibernate.show_sql">true</prop> 
       <!-- change this to 'verify' before running as a production app --> 
       <prop key="hibernate.hbm2ddl.auto">update</prop> 
       <prop key="hibernate.connection.autocommit">false</prop> 
      </props> 
     </property> 
    </bean> 
</beans>

服務-beans.xml文件

<beans> 
<import resource="classpath:applicationContext.xml"/> 

<import resource="classpath:META-INF/cxf/cxf.xml" /> 
<import resource="classpath:META-INF/cxf/cxf-servlet.xml"/> 

<jaxrs:server id="myContainer" address="/"> 
    <jaxrs:serviceBeans> 
     <ref bean="mywebservice"/> 
    </jaxrs:serviceBeans> 
</jaxrs:server> 

</beans>

WebService.java

Path("ws") 
public class WebService { 

private static final Logger logger = LogManager.getLogger("WebService"); 

@Resource 
private LocationDAO locationdao; 

    @GET 
    @Path("getLocations") 
    @Produces({MediaType.APPLICATION_JSON}) 
    public List<Location> getLocation(){ 
    logger.info("VA-- GETTING LOCATION"); 
    if(locationdao == null){ 
     logger.error("VA-- DAO IS NULL"); 
    } 
    return locationdao.listLocations(); 
    }

LocationDAO.java

@Service 
public class LocationDAOImpl implements LocationDAO{ 

private static final Logger logger = LogManager.getLogger("LocationDAOImpl"); 

@PersistenceContext 
EntityManager em; 

@Transactional 
public void addLocation(Location location) { 
    //Do stuff....  
}

來源

2013-08-27 truthful_ness

關於http://stackoverflow.com/questions/6672701/jersey-and-spring-integration-bean-injections-are-null-at-runtime？那裏的答案建議使用SpringServlet，它理解Spring應用程序上下文配置指令。 – BobG

@BobG我試過了。當我切換到springservlet時，我得到一個404，當我點擊網址時，我認爲最好是路由到servlet，但得到一個空的bean ..（兩個邪惡較少）。仍然不知道如何解決... –

它不知道運動衫，但是這裏有一個完整的tuto，用於使用com.sun.jersey.spi.spring.container.servlet.SpringServlet的Jersey + Spring webapp：http：//www.mkyong.com/webservices/jax -rs /球衣 - 彈簧 - 積分 - 例如/ – Julien

固定。的解決方案是：

從web.xml中刪除

<豆ID = 「爲MyWebService」類= 「com.mypackage.webservice.Webservice」/>

這條線引起空指針錯誤，因爲我將XML與註釋混合在一起。我得到了解決方案here的想法。

註釋web服務與@Controller - 這指示這是在表示層

註釋的LocationDao與@Repository - 結果表明是在持久層

新增另一類服務並用@Service註釋 - 表示這是一個服務層。

一定要在bean的setter上標註@Autowired ...這也會導致空指針錯誤。

這改善了我的應用程序的整體流程，並將邏輯分隔爲清晰的圖層。

來源

2013-08-30 04:37:23

如何在多servlet web服務中配置Spring bean

回答

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