Spring autowired bean causes null pointer

Question

I have a logger class that makes use of a service. Each time a new logger is created, I expect to have access to the singleton scoped logging service.

I autowire the

Answer 1

Just want to add my 2 cents.

I once encountered the same issue when I was not quite used to the life in the IoC world. The @Autowired field of one of my beans is null at runtime.

The root cause is, instead of using the auto-created bean maintained by the Spring IoC container (whose @Autowired field is indeed properly injected), I am newing my own instance of that bean and using it. Of course this one's @Autowired field is null because Spring has no chance to inject it.

Answer 2

Within your application context you have to do reference your Logger :

<context:component-scan base-package="com.platform"/>
<bean id="asyncLoggingService" class="com.platform.services.AsyncLoggingServiceImplementation" scope="prototype"/>
<bean id="ourLogger" class="com.platform.utils.OurLogger"/>

Then you've to inject it into your service :

@Service
public class AsyncAccountServiceImplementation implements AsyncAccountService
{

 private static final String GATEWAY_IP_BLOCK = "1";

 @Autowired
 private OurLogger logger;

}

Answer 3

Use spring framework Unit test instead of JUnit test to inject your spring bean.

May be that will help you.

Answer 4

When you create an object by new, autowire\inject don't work...

See this link and this link for some workaround.

Anyway if you would inject a logger i suggest you this my answer to another topic.

Answer 5

If you are using AspectJ you can use @Configurable:

@Configurable
public class OurLogger {
  ..
}

See: Using AspectJ to dependency inject domain objects with Spring