jboss-aop configuration help needed

[csr1978]

Hi,

I am new to JBoss AOP concept and need some help in configuring it. I have a web application deployed to jboss server 4.2.0. I am trying to configure logging interceptor for the web application with aop. so far i followed these steps:

package jboss.aop.interceptor; import org.jboss.aop.joinpoint.Invocation;import org.jboss.aop.joinpoint.MethodInvocation;import org.jboss.aop.advice.Interceptor; public class MethodInterceptor implements Interceptor{ public String getName() { return "MethodInterceptor"; } public Object invoke(Invocation invocation) throws Throwable { try { MethodInvocation mi = (MethodInvocation)invocation; System.out.println("<<< Entering MethodInterceptor for: " + mi.getMethod().toString()); return invocation.invokeNext(); } finally { System.out.println(">>> Leaving MethodInterceptor"); } }}

compiled this class and created a jar file with this class.
created jboss-aop.xml file as follows:

<?xml version="1.0" encoding="UTF-8"?><aop> <bind pointcut="execution(* com.tnt.thin.servlet.DDServlet->*(..))"> <interceptor class="jboss.aop.interceptor.MethodInterceptor"/> </bind></aop>

Modified jboss-service.xml file in server/default/deploy/jboss-aop-jdk50.deployer/META-INF/jboss-service.xml to:

<attribute name="EnableLoadtimeWeaving">true</attribute>

copied the jar file to server/default/lib directory
copied the jboss-aop.xml file to server/default/deploy directory.

I restarted the jboss server after doing all of the above steps and got this error:

Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: No ClassLoaders found for: jboss.aop.interceptor.MethodInterceptor

Could anyone point me to the right direction.

Thanks,
Srikanth.

[kabirkhan]

Modify your jar to have the .aop extension, put the jboss-aop.xml into the .aop archive's META-INF directory. Deploy the file to the deploy folder.

See the injboss example that comes with the download for more examples

[csr1978]

Kabir,

To be more specific i am trying to configure logging for EAR file. So, my interceptor should be accessible by both web(.WAR) and ejb(.JAR) files.

I created mylogging.aop file with jboss-aop.xml file in meta-inf dir. and copied it to deploy dir of jboss. I still get:

java.lang.ClassNotFoundException: log.logging.trace.MyMethodInterceptor

do i have to add this .aop file to application.xml and copy the .aop file to root of EAR file? Please suggest me.

Thanks,
Srikanth.

[csr1978]

Kabir,

I tried injboss->SimpleInterceptor example. I build the aopexample.ear file and deployed it. When i run it i could see only the println statements from ExampleValue and ExampleSessionBean but i couldn't see any println statements from SimpleInterceptor like <<< Entering SimpleInterceptor:

What am i doing wrong? I do not see any exceptions though?

[csr1978]

BTW i am using JBoss 4.2.0GA.

[kabirkhan]

Turn on loadtime weaving. http://www.jboss.com/index.html?module=bb&op=viewtopic&t=110955

[csr1978]

thank you. It worked!