Question

I have next structure:

@Component public abstract class
HuginJob extends QuartzJobBean {...}


@Component("CisxJob") public class
CisxJob extends HuginJob {...}

Now I want to test CisxJob:

 @RunWith(SpringJUnit4ClassRunner.class)

 @ContextConfiguration({"/applicationContext-test.xml" })

public class CisxJobTest {

     @Autowired
     @Qualifier("CisxJob")
     private CisxJob          cisxJob;
..... }

Here is part of applicationContext-test.xml

<context:annotation-config />
<context:component-scan base-package="no.hugin.jobscheduler" />

Error is

org.springframework.beans.factory.BeanCreationException:
Error creating bean with name ‘no.hugin.jobscheduler.job.cisx.CisxJobTest’: Injection of autowired dependencies failed;
nested exception is rg.springframework.beans.factory.BeanCreationException:
Could not autowire field: private no.hugin.jobscheduler.job.cisx.CisxJob
no.hugin.jobscheduler.job.cisx.CisxJobTest.cisxJob; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:
No matching bean of type [no.hugin.jobscheduler.job.cisx.CisxJob] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for this dependency.
Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=CisxJob)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
………….

The problem is in extending of QuartzJobBean – but I need it.

Thank you

Answer 1

The problem is in a way Spring generates AOP proxies. When class being proxied implements any interfaces, Spring by default creates a JDK proxy that implement these interfaces.

Since QuartzJobBean implements an interface Job, CisxJob is proxied as Job, and that proxy can’t be autowired to the field of type CisxJob.

There are two solutions:

• If your bean implement any interfaces, create an interface for its business methods as well, and use it as a field type:

   public interface CisxJob { ... }
  
   @Component("CisxJob")
   public class CisxJobImpl extends HuginJob implements CisxJob {...} 
  

• Use proxy-target-class mode:

   <aop:aspectj-autoproxy proxy-target-class = "true" />
  

See also:

• 7.6 Proxying mechanisms