Spring autowire null pointer exception

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, May 22 '17 at 12:14
How you instanciate the class ABS? Is it a spring managed bean? — Jens, May 22 '17 at 12:14

Janar · Accepted Answer · 2017-05-22T12:17:32.853

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 '17 at 12:17

answered May 22 '17 at 12:15

Janar

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which one I should use from these? – yuva ツ May 22 '17 at 12:16
IT's not my controller or service class – yuva ツ May 22 '17 at 12:17
@yuvaツ is it a repository? if not use '@Component' – Janar May 22 '17 at 12:19
No. Tried with component also.. not working – yuva ツ May 22 '17 at 12:19
see code updated.. – yuva ツ May 22 '17 at 12:22
then you are using the AbcDao wrong. Where do you autowire it into? post controller/service code. – Janar May 22 '17 at 12:22
Is it neccessory to autowire my DAO class also? – yuva ツ May 22 '17 at 12:23
yes, of course. Else it wouldn't be managed by Spring – Janar May 22 '17 at 12:24
Thank you so much.. It's working now :) – yuva ツ May 22 '17 at 12:28

Spring autowire null pointer exception

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