title: AOP exception when calling Around aspects on
body: <p>I am trying to run a aspect on all service methods. but this seems to fail for the methods which have primitive return type. I am getting this error org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type . is it necessary that all methods for used for aspect needs to have non primitive return types? Thanks</p>
  
  <pre><code>  @Aspect
  @Component
  public class ServiceAspect
  {
      private static final Logger LOG = Logger.getLogger(ServiceAspect.class);
  
     @Pointcut("execution(* com.xxx.service..*.*(..))")
  
      public void perform()
      {
  
      }
  
      @Around("perform()")
      public void performTimeCal(ProceedingJoinPoint joinPoint)
      {
          try
          {
              Date start = DateUtils.newDate();
              String processingTime = null;
              joinPoint.proceed();
  
              processingTime = DateUtils.computeDateDifference(start,
              DateUtils.newDate());
              LOG.info("STAT: " + getSimpleClassName(joinPoint) + "."
              + joinPoint.getTarget() + "(): " + processingTime);
          }
          catch (Throwable e)
          {
              e.printStackTrace();
          }
  
      }
  
      private String getSimpleClassName(ProceedingJoinPoint joinPoint)
      {
          if (joinPoint.getThis() != null)
          {
              return joinPoint.getThis().getClass().getSimpleName();
          }
          return "";
  
      }
  
  }
  
     Service Method
  
     @Service
    public PropertyService
    {
       public boolean isMessageProcessingEnabled()
       {
         // DAO CODE
       }
  
  
    }
  </code></pre>
  
  <p>Stacktrace</p>
  
  <pre><code>org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: public boolean com.xxxxxxx.service.admin.PropertyService.isMessageProcessingEnabled()
      at org.springframework.aop.framework.CglibAopProxy.processReturnType(CglibAopProxy.java:349)
      at org.springframework.aop.framework.CglibAopProxy.access$000(CglibAopProxy.java:82)
      at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:633)
      at com.xxxxxxx.service.admin.ApplicationPropertyService$$EnhancerByCGLIB$$1a4e8f96.isMessageProcessingEnabled(&lt;generated&gt;)
      at com.xxxxxxx.processBoardMessages(BoardMessageProcessor.java:136)
      at com.xxxxxxx.processMessage(BoardMessageProcessor.java:95)
      at com.xxxxxxx.service.BrdServiceTest.testMessage(BoardServiceTest.java:126)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
      at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
      at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
      at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
  </code></pre>