Spring Autowire空指针异常 [英] Spring autowire null pointer exception

问题描述

xml配置-

<bean id="DS" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >

        <property name="driverClassName" value="${DB.DRIVERCLASS}" />
        <property name="url" value="${TABLEMAINT.URL}" />       
        <property name="username" value="${TABLEMAINT.USER}" />
        <property name="password" value="${TABLEMAINT.PASSWORD}" />
    </bean>

@Component
class AbcDAO{
 @Autowired
private DriverManagerDataSource DS;
   public void getConnection(){
      System.out.println("DS - "+DS..getConnection());
   }
}

数据源DS.getConnection获取空指针异常.

datasource DS.getConnection getting null pointer exception.

自动装配不起作用.

有什么解决办法吗?

推荐答案

ABC不受spring管理.

ABC is not managed by spring.

要使@Autowired批注起作用，您必须使用以下任一方法批注该类:

For @Autowired annotation to work you have to annotate that class with either of the following:

@Component
@Service
@Controller
@Repository

或在XML配置中定义它

or define it in the XML configuration

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