Apache Servicemix :: Bundles :: Spring Aop framework and share solution sharing

Apache Servicemix :: Bundles :: Spring Aop framework and share solution sharing Spring AOP is a lightweight AOP (facing cut -out programming) framework, which provides a way to weave cross -cut logic through proxy objects at runtime.Although Spring AOP is relatively easy to use, some common problems may still be encountered during use.This article will introduce several problems commonly found in the Bundles of Apache Servicemix in Bundles, and provide corresponding solutions. 1. Question: Cannot woven the logic correctly. Solution: Make sure to correctly configure the `<AOP: Aspectj-Autoproxy>` `in the Spring configuration file, and the target class is correctly scanned and marked as an agent. Example code: <aop:aspectj-autoproxy/> <bean id="myAspect" class="com.example.MyAspect"/> <bean id="targetBean" class="com.example.TargetBean"/> <aop:config> <aop:aspect ref="myAspect"> <aop:pointcut id="myPointcut" expression="execution(* com.example.TargetBean.doSomething(..))"/> <aop:before pointcut-ref="myPointcut" method="beforeAdvice"/> </aop:aspect> </aop:config> 2. Question: The logic of the cut surface is invalid. Solution: Check whether the method corresponding to the cutting logic is implemented correctly, and whether the cut point expression is correctly matched. Example code: @Aspect public class MyAspect { @Before("execution(* com.example.TargetBean.doSomething(..))") public void beforeAdvice() { // The logic of the previous execution before the target method is executed } } 3. Question: The logic of the cut surface causes abnormality. Solution: Capture the abnormality of the target method through the after-zrowing advice method and handle it accordingly. Example code: @Aspect public class MyAspect { @AfterThrowing(pointcut = "execution(* com.example.TargetBean.doSomething(..))", throwing = "ex") public void afterThrowingAdvice(Exception ex) { // Abnormal notification, the abnormality of the target method thrown } } 4. Question: The return value of the target method cannot be obtained. Solution: Use after Returning Advice to get the return value of the target method. Example code: @Aspect public class MyAspect { @AfterReturning(pointcut = "execution(* com.example.TargetBean.doSomething(..))", returning = "result") public void afterReturningAdvice(Object result) { // Rear notification, get the return value after the target method is executed } } The above is a solution that often see problems in Apache Servicemix's Bundles using the Spring AOP framework.By understanding and mastering these solutions, we can better solve common problems encountered in the use of Spring AOP, and improve development efficiency and code quality.