Spring autowire null pointer exception [duplicate]

Question

xml configuration -

<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());
   }
}

datasource DS.getConnection getting null pointer exception.

Autowiring not working.

Is there any solution?

Read the Java naming convention. Property names should start with lower case character so your "DS" must be "ds" — Jens
– Jens, Commented May 22, 2017 at 12:14
How you instanciate the class ABS? Is it a spring managed bean? — Jens
– Jens, Commented May 22, 2017 at 12:14

Janar · Accepted Answer · 2017-05-22 12:17:32Z

1

ABC is not managed by spring.

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

@Component
@Service
@Controller
@Repository

or define it in the XML configuration

edited May 22, 2017 at 12:17

answered May 22, 2017 at 12:15

Janar

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9 Comments

yuva ツ Over a year ago

which one I should use from these?

yuva ツ Over a year ago

IT's not my controller or service class

Janar Over a year ago

@yuvaツ is it a repository? if not use '@Component'

yuva ツ Over a year ago

No. Tried with component also.. not working

yuva ツ Over a year ago

see code updated..

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