问题
I'm working on REST service which is developed using Apache-CXF. I'm using Spring 3.1 annotations for wiring the bean. I have written an interceptor which intercepts my REST method for monitoring purposes. To do this, i have to autowire my Monitor class which is added as library in my project. @Autowired doesn't seems to be working in this case and results into NPE. Am i doing anything wrong here ?
@Aspect
@Component
public class ApplicationMonitoring {
Logger logger = LoggerFactory.getLogger(ApplicationMonitoring.class);
@Autowired
private Monitor monitor;
@Around("execution(* com.abc.xyz.rest.CustomerResource.getCustomerByAccountNumber(..))")
public Object invoke(ProceedingJoinPoint joinPoint) throws Throwable {
String methodName = joinPoint.getSignature().getName();
long start = System.currentTimeMillis();
try {
// proceed to original method call
Object result = joinPoint.proceed();
monitor.elapsedTime(methodName, System.currentTimeMillis() - start);
return result;
} catch (Exception e) {
throw e;
}
}
ApplicationContext:
.................
......
<context:spring-configured />
<context:component-scan base-package="com.abc">
<context:exclude-filter expression="org.springframework.stereotype.Controller"
type="annotation" />
</context:component-scan>
<context:annotation-config/>
.............
回答1:
I'm not a master of Spring but as far as I know a bit of it I'll try to put into words as best as I can.
I think you noticed, but @Aspect is not spring-based, so in order it to be scanned you need to add <aop:aspectj-autoproxy/>
, furthermore I think the issue is that two instances of the same class are being created, one for each container(spring and AspectJ), to avoid that I'd use a factory method to retrieve the exact same instance to the spring container (I'm not sure at a 100% if I explained it properly), - remember that the one for the aspect is created first-, in such a way:
<bean id="id_of_your_bean" class="ApplicationMonitoring" factory-method="aspectOf">
//other stuff
</bean>
回答2:
Found the solution in this blog
The aspect is a singleton object and is created outside the Spring container. A solution with XML configuration is to use Spring's factory method to retrieve the aspect.
<bean id="monitoringAspect" class="com.myaapp.ApplicationMonitoring"
factory-method="aspectOf" />
With this configuration the aspect will be treated as any other Spring bean and the autowiring will work as normal.
来源:https://stackoverflow.com/questions/19641331/autowired-doesnt-work-with-interceptor