TapestryFilter question

[Neo Anderson <ja...@yahoo.co.uk>]

I try a simall test using aspectj to capture the doFilter() execution of
TapestryFilter.java. The pointcut intends to caputre the doFilter method and
prints out some information in the e.g. catalina.out log file. The code
looks as below:

public aspect Test{
    pointcut intercept(): execution(*
org.apache.tapestry5.services.TapestryFilter.doFilter(..));

    void around() : intercept(){
        System.out.println(" ...... test info ");
        logger.debug(" ..... test info using slf4j"); // configure log
properties already. 
        proceed();
    }
}

If I copy TapestryFilter.java to my own folder e.g. myproject/pkg/web/ and
rename it to e.g. MyTapestryFilter.java. When accessing from the brwoswer
http://localhost:8080/myproject. The log will show the debug information
printed in the catalina.out log file. However, if the web.xml filter class
switch back using TapestryFilter.java, then nothing happens.

I am just curious if Tapestry5 add any contract that prevents bytecode level
weaving? Or is there any source code as entry point I can start to have a
look (TapestryFilter.java looks like a normal Filter calss)? 

I appreciate any help.

Thank you.



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Re: TapestryFilter question

[Howard Lewis Ship <hl...@gmail.com>]

Nothing special in Tapestry ... most likely it's a classloader conflict
between AspectJ and Tomcat. Tomcat must not be loading the bytecode enhanced
version of TapestryFilter, instead loading the standard version.

On Thu, Sep 3, 2009 at 10:51 AM, Neo Anderson
<ja...@yahoo.co.uk>wrote:

>
> I try a simall test using aspectj to capture the doFilter() execution of
> TapestryFilter.java. The pointcut intends to caputre the doFilter method
> and
> prints out some information in the e.g. catalina.out log file. The code
> looks as below:
>
> public aspect Test{
>    pointcut intercept(): execution(*
> org.apache.tapestry5.services.TapestryFilter.doFilter(..));
>
>    void around() : intercept(){
>        System.out.println(" ...... test info ");
>        logger.debug(" ..... test info using slf4j"); // configure log
> properties already.
>        proceed();
>    }
> }
>
> If I copy TapestryFilter.java to my own folder e.g. myproject/pkg/web/ and
> rename it to e.g. MyTapestryFilter.java. When accessing from the brwoswer
> http://localhost:8080/myproject. The log will show the debug information
> printed in the catalina.out log file. However, if the web.xml filter class
> switch back using TapestryFilter.java, then nothing happens.
>
> I am just curious if Tapestry5 add any contract that prevents bytecode
> level
> weaving? Or is there any source code as entry point I can start to have a
> look (TapestryFilter.java looks like a normal Filter calss)?
>
> I appreciate any help.
>
> Thank you.
>
>
>
> --
> View this message in context:
> http://n2.nabble.com/TapestryFilter-question-tp3574931p3574931.html
> Sent from the Tapestry Users mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> For additional commands, e-mail: users-help@tapestry.apache.org
>
>


-- 
Howard M. Lewis Ship

Creator of Apache Tapestry

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