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POSeeing odd behavior when learning SpringAOP using @AspectJ style
 

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  1. POSeeing odd behavior when learning SpringAOP using @AspectJ style
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    <p>Iam a new bee to Spring Framework and i am referring to documentation available with spring projects.</p> <p>In the process i am also learning a new concept AOP. I am following the spring documentation to try out some samples <a href="http://docs.spring.io/spring/docs/current/spring-framework-reference/html/aop.html" rel="nofollow">http://docs.spring.io/spring/docs/current/spring-framework-reference/html/aop.html</a></p> <p>I tried to use "@AspectJ" style for my first Aspect Helloworld using Spring AOP.</p> <p>This is my context config file</p> <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"&gt; &lt;aop:aspectj-autoproxy expose-proxy="false" /&gt; &lt;context:annotation-config&gt;&lt;/context:annotation-config&gt; &lt;bean id="aoProgrammingAspectJ" class = "com.AOProgramming.AOProgrammingAspectJ"&gt; &lt;/bean&gt; &lt;bean id="aoProgrammingImpl" class = "com.AOProgramming.AOProgrammingImpl"&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>This is a simple interface</p> <pre><code>package com.AOProgramming; public interface AOProgrammingInterface { public void startAspecting(); } </code></pre> <p>I implement this interface </p> <pre><code>package com.AOProgramming; public class AOProgrammingImpl implements AOProgrammingInterface { @Override public void startAspecting() { System.out.println("THe Aspecting has just begun for :"); } } </code></pre> <p>This is where i am defining the aspect definition for pointcut and advice</p> <pre><code>package com.AOProgramming; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; @Aspect public class AOProgrammingAspectJ { @Pointcut("execution( * com.AOProgramming.*.*(..))") public void cuttingOne() {} @Before("cuttingOne()") public void adviceCuttingOne1(){ System.out.println("This is the at the beginning"); } } </code></pre> <p>This is my actual INVOKER class</p> <pre><code>package com.AOProgramming; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class AOProgrammingInvokerApp { public static void main(String[] args){ ApplicationContext context = new ClassPathXmlApplicationContext("AOProgramming-servlet.xml"); AOProgrammingImpl obj = (AOProgrammingImpl) context.getBean("aoProgrammingImpl"); obj.startAspecting(); } } </code></pre> <p>When i tried to execute the sample i am getting the following Error</p> <pre><code>Exception in thread "main" java.lang.ClassCastException: com.sun.proxy.$Proxy6 cannot be cast to com.AOProgramming.AOProgrammingImpl at com.AOProgramming.AOProgrammingInvokerApp.main(AOProgrammingInvokerApp.java:12) </code></pre> <p>I am trying to re-read the complete page still i have the same issue also not getting enough material dealing with latest Spring AOP samples. All pre-dates to 2002 or 2008 which has different way of explaining SpringAOP.</p> <p>Can someone help me to understand what i missed here</p> <p>Appreciate your help</p>
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    1. USlinux developer
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    1. COThe actual type of the Spring bean (and of its proxy) is AOProgrammingInterface. That's the type you should use when getting the bean from the context and using it.
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    2. COThanks for the comment...
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      1. USlinux developer
 

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